JP4858774B2 - Content distribution system, content distribution method, terminal device, target device, and reference device - Google Patents

Description

  The present invention relates to a content distribution system, a content distribution method, a terminal device, a target device, and a reference device.

Conventionally, a predetermined signal is transmitted from a terminal device possessed by a user to an information display device that displays information such as images in public places or museums and provides information to people, and the information display device A content distribution system that distributes information (hereinafter referred to as content) related to displayed information to a terminal device is known (see, for example, Patent Document 1). In such a content distribution system, unique information such as the address of the terminal device is transmitted from the terminal device to the information display device by infrared rays or the like, and the content is distributed to the terminal device based on this address.
JP 2005-244469 A

However, in the above conventional technique, there is a problem from the viewpoint of security protection and information leakage because it is necessary to transmit the unique information of the terminal device to the information display device. In particular, when infrared rays are used for transmission of specific information, there is a risk that information leakage can easily occur if the infrared rays are intercepted by a third party.
The present invention has been made in view of the above points, and an object of the present invention is to provide a content distribution system and a content distribution method capable of distributing content without obtaining specific information on the user side to a third party. And a terminal device, a target device, and a reference device used in the content distribution system.

  The present invention has been made to solve the above-described problem, and transmits a first signal including a first session key, and a second signal including a second session key associated with the first session key. Receiving the first signal and receiving the third signal including the first session key included in the first signal, and receiving the second signal and the third signal. And a reference device that determines the association between the first session key and the second session key included in the received signals, and the first signal when the association is determined to be correct According to the present invention, a content distribution system is provided that distributes content designated in accordance with the terminal device to the terminal device.

  According to the present invention, the first session key is transmitted from the terminal device to the reference device via the target device, and the second session key is transmitted directly from the terminal device to the reference device. The association of the two session keys is determined. And when it determines with matching being correct, a content is delivered to a terminal device. The content to be distributed is designated according to the first signal when the terminal device transmits the first session key. That is, the distribution of content is performed based on the determination result of the session key in the reference device, and the distributed content is controlled by transmitting the first signal to the target device.

  A fourth signal including information for acquiring a content by transmitting a first signal including a first session key, transmitting a second signal including a second session key associated with the first session key; A terminal device that receives a signal and transmits a fifth signal requesting distribution of the content in accordance with information for acquiring the content, and receives the content according to the request from a transmission destination of the fifth signal; and A target device for receiving a signal and transmitting a third signal including a first session key included in the first signal and identification information for designating the content requested to be distributed; the second signal; 3 signals are received, the association between the first session key and the second session key included in these received signals is determined, and if the association is determined to be correct, the received A reference device that transmits the fourth signal based on the identification information included in the three signals to the terminal device that is the transmission source of the received second signal, and the fifth signal that is received and received by the received fifth signal. A content distribution system including a content storage device that transmits the content to a terminal device that is a transmission source of the fifth signal.

  According to the present invention, the first session key is transmitted from the terminal device to the reference device via the target device, and the second session key is transmitted directly from the terminal device to the reference device. The association of the two session keys is determined. When it is determined that the association is correct, information for acquiring the content is sent to the terminal device, and the terminal device acquires the content based on the information for acquiring the content.

  Also, the first signal including the first session key is transmitted, the second signal including the second session key associated with the first session key is transmitted, and designated by the transmission destination of the first signal. A terminal device that receives content from a transmission destination of the second signal; a first device that receives the first signal and includes a first session key included in the first signal; and identification information for designating content to be distributed. Receiving the second signal and the third signal, and determining the correspondence between the first session key and the second session key included in the received signals, and the correspondence is correct Is determined, the fourth signal requesting distribution of the content is transmitted based on the identification information included in the received third signal, and the content of the request is transmitted from the transmission destination of the fourth signal. A reference device that transmits the received content to a terminal device that is a transmission source of the received second signal, and receives the fourth signal and receives the content requested by the received fourth signal. A content distribution system including a content storage device that transmits to a reference device that is a transmission source of four signals is provided.

  According to the present invention, the first session key is transmitted from the terminal device to the reference device via the target device, and the second session key is transmitted directly from the terminal device to the reference device. The association of the two session keys is determined. When it is determined that the association is correct, the reference device acquires content from the content storage device and distributes the content to the terminal device.

  Also, the first signal including the first session key is transmitted, the second signal including the second session key associated with the first session key is transmitted, and designated by the transmission destination of the first signal. A terminal device that receives content from a transmission destination of the second signal; a first device that receives the first signal and includes a first session key included in the first signal; and identification information for designating content to be distributed. Receiving the second signal and the third signal, and determining the correspondence between the first session key and the second session key included in the received signals, and the correspondence is correct When it is determined that the content is extracted from the content database based on the identification information included in the received third signal, the extracted content is the second signal received. Providing constructed content distribution system and a reference device to be transmitted to the terminal device which is the transmission source.

  According to the present invention, the first session key is transmitted from the terminal device to the reference device via the target device, and the second session key is transmitted directly from the terminal device to the reference device. The association of the two session keys is determined. When it is determined that the association is correct, the reference device extracts the content from the content database and distributes the content to the terminal device.

  A fourth signal including information for acquiring a content by transmitting a first signal including a first session key, transmitting a second signal including a second session key associated with the first session key; A terminal device that receives a signal and transmits a fifth signal requesting distribution of the content in accordance with information for acquiring the content, and receives the content according to the request from a transmission destination of the fifth signal; and Receiving a signal, designating a content to be distributed in accordance with the received first signal, a first session key included in the received first signal, and information for acquiring the content for the designated content; A target device that transmits a third signal including: the second signal and the third signal; and a first session key and a second set included in the received signals. And a reference device that transmits the fourth signal based on the received third signal to a terminal device that is a transmission source of the received second signal when it is determined that the association is correct. A content distribution system comprising: a content storage device that receives the fifth signal and transmits the content requested by the received fifth signal to a terminal device that is a transmission source of the fifth signal To do.

  According to the present invention, the first session key is transmitted from the terminal device to the reference device via the target device, and the second session key is transmitted directly from the terminal device to the reference device. The association of the two session keys is determined. When it is determined that the association is correct, information for acquiring the content is sent to the terminal device, and the terminal device acquires the content based on the information for acquiring the content.

  Also, the first signal including the first session key is transmitted, the second signal including the second session key associated with the first session key is transmitted, and designated by the transmission destination of the first signal. A terminal device that receives content from the transmission destination of the second signal, a content that receives the first signal, distributes content according to the received first signal, and is included in the received first signal A target device that transmits a third signal including a session key and information for acquiring the content for the specified content; the second signal and the third signal are received; and included in the received signals If the association between the first session key and the second session key is determined and it is determined that the association is correct, distribution of content is requested based on the received third signal. A reference device that transmits four signals, receives the content related to the request from a transmission destination of the fourth signal, and transmits the received content to a terminal device that is a transmission source of the received second signal; There is provided a content distribution system including a content storage device that receives a signal and transmits content requested by the received fourth signal to a reference device that is a transmission source of the fourth signal.

  According to the present invention, the first session key is transmitted from the terminal device to the reference device via the target device, and the second session key is transmitted directly from the terminal device to the reference device. The association of the two session keys is determined. When it is determined that the association is correct, the reference device acquires content from the content storage device and distributes the content to the terminal device.

  Also, the first signal including the first session key is transmitted, the second signal including the second session key associated with the first session key is transmitted, and designated by the transmission destination of the first signal. A terminal device that receives the content from the transmission destination of the second signal, the first device that receives the first signal, extracts the content from the content database according to the received first signal, and includes the first signal included in the received first signal A target device for transmitting a third signal including a session key and the extracted content; the second signal and the third signal are received; and the first session key and the second session included in the received signals When the key association is determined and the association is determined to be correct, the content included in the received third signal is the source of the received second signal. Providing constructed content distribution system and a reference device to be transmitted to the terminal device.

  According to the present invention, the first session key is transmitted from the terminal device to the reference device via the target device, and the second session key is transmitted directly from the terminal device to the reference device. The association of the two session keys is determined. Further, the content is sent from the target device to the reference device. When it is determined that the association is correct, the reference device distributes the content acquired from the target device to the terminal device.

  A target device that receives a first signal including a first session key from the terminal device and transmits a third signal including the first session key included in the first signal; and the first session from the terminal device. The second signal including the second session key associated with the key is received, the third signal is received from the target device, and the correspondence between the first session key and the second session key included in the received signals And a reference device for determining attachment, and the content specified according to the first signal is distributed to the terminal device when it is determined that the association is correct Provide a distribution system.

  In the content distribution system, the information for acquiring the content is any one of a URL, an address, a file name, and pointer information indicating a location where the content is stored.

  In the content distribution system, the first session key is configured as a unique bit string that does not include information specifying the terminal device.

  In the content distribution system, the first session key and the second session key are the same.

  In the content distribution system, the second session key is hashed to be the first session key.

  In the content distribution system, the first session key includes a random number.

  Further, in the content distribution system, the first session key is configured based on a character string obtained by combining a predetermined counter value with a character string unique to the terminal device.

  In the content distribution system, the target device is provided in association with an exhibit or an advertisement.

  In the content distribution system, the first signal is transmitted by wireless communication.

  In the content distribution system, the wireless communication uses infrared rays.

  In addition, the first signal including the first session key is transmitted to the first transmission destination, and the second signal including the second session key associated with the first session key is transmitted to the second transmission destination. The first session key and the second session key included in the received signal at the second transmission destination that has received the second signal and the first signal sent from the first transmission destination are associated with each other. Provided is a terminal device that receives content corresponding to the first signal distributed when it is determined to be correct.

  Further, the terminal device includes means for displaying the received content.

  A terminal device transmitting a first signal including a first session key to the target device; and a target device receiving the first signal and including a first session key included in the first signal. To the reference device, the target device specifying the content in response to the first signal, and the terminal device including a second signal including a second session key associated with the first session key. Transmitting to a reference device; receiving a second signal and the third signal by the reference device; determining a correspondence between a first session key and a second session key included in the received signals; A content distribution method comprising: a terminal device receiving the designated content distributed when it is determined that the association is correct Subjected to.

  According to the present invention, the first session key is transmitted to the reference device via the target device, the second session key is directly transmitted to the reference device, and the content is obtained when these two session keys can be collated by the reference device. Since the content is distributed, the content can be distributed even if the unique information of the terminal device is not included in the first session key. Therefore, since it is not necessary to include the unique information of the terminal device in the first session key to be sent to the target device, it is possible to prevent the unique information from being obtained by a third party and to protect the security.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
(First embodiment)
FIG. 1 is a configuration diagram showing an outline of a content distribution system according to a first embodiment of the present invention. The content distribution system is a system for distributing content as information related to the target device 20 to the terminal device 10 owned by the user. As the target device 20, for example, there is an information display device that is installed in a city or the like and provides image information and text information to people. In this case, content related to the image information and text information is distributed to the terminal device 10. In addition, the target device 20 can be installed near an exhibit such as a painting or sculpture in a museum or the like, and content related to the exhibit can be distributed to the terminal device 10.

  In FIG. 1, the terminal device 10 generates two session keys SK1 and SK2, transmits one session key (referred to as SK1) to the reference device 30 via the target device 20, and the other session key (SK2). To the reference device 30 directly. The terminal device 10 also transmits an address on the network of the terminal device 10 to the reference device 30 as information for specifying the terminal device 10. In addition to transferring the session key SK1 to the reference device 30, the target device 20 also has a unique spot ID that identifies the target device 20 and a context ID that indicates the current state of the target device 20 (content distributed by this context ID) To the reference device 30.

  The session key SK1 is transmitted from the terminal device 10 to the target device 20 by infrared communication. Therefore, the user goes to the vicinity of the target device 20 with the terminal device 10 and performs a predetermined operation with the terminal device 10 facing the target device 20. In addition, communication is performed between the reference device 30, the terminal device 10, and the target device 20 via a wired LAN (Local Area Network), a wireless LAN, or another type of network (not shown).

  The reference device 30 that has received the session keys SK1 and SK2 sent via two different paths collates the two session keys and determines whether or not the session keys SK1 and SK2 have a predetermined relationship. To do. As the simplest example of this “predetermined relationship”, the relationship that the session keys SK1 and SK2 are the same is applied here. In this example, the terminal device 10 generates two identical session keys SK1 and SK2 (that is, SK1 = SK2), and these are transmitted to the reference device 30 through different paths.

  When it is determined in the reference device 30 that the session keys SK1 and SK2 have the predetermined relationship, the reference device 30 obtains the content by the terminal device 10 (identifying the terminal device 10 by the transmitted address). As information to be transmitted, a URL (Uniform Resource Locator) indicating the location where the content is stored is transmitted to the terminal device 10. The URL to be transmitted is determined by the reference device 30 according to the spot ID and context ID received from the target device 20. In order to make the determination, the reference device 10 stores a correspondence table indicating the correspondence between the spot ID and context ID and the content URL.

  The content distributed to the terminal device 10 is stored in the content storage device 40. The terminal device 10 that has received the URL accesses the content storage device 40 corresponding to the URL and requests content. In response to this request, the content storage device 40 distributes the target content to the terminal device 10.

  Here, the session keys SK1 and SK2 generated by the terminal device 10 are configured not to include information unique to the terminal device 10 in order to prevent the terminal device 10 from being specified by the target device 20. In addition, since it is possible to determine that the session keys SK1 and SK2 acquired by two different paths in the reference device 30 are sent from the same terminal device 10, the session keys from other terminal devices are duplicated. Session keys SK1 and SK2 are formed as character strings not to be processed. The terminal device 10 uses the following method as a session key generation method that can obtain the session keys SK1 and SK2 that satisfy these conditions. In any of the following methods, since the session key is generated by the terminal device 10 alone, it is not necessary to manage the session key by providing, for example, some management server, and the system configuration can be simplified. it can.

(1) Generation of Session Key by Random Number When the terminal device 10 generates a session key, the terminal device 10 generates a random number of a predetermined size (number of digits or number of bits) each time, and generates the generated random number as session keys SK1 and SK2. And Since the session key generated by this method is generated randomly, the terminal device 10 cannot be identified by the target device 20, and a sufficiently large random number is used to prevent duplication. be able to.
When strict anonymity for the terminal device 10 is not required, a unique ID that can identify the terminal device 10 may be added to the generated random number. By doing so, it is possible to avoid duplication with session keys from other terminal devices.
The method of generating a session key using a random number in this way has an advantage that the session key generation process in the terminal device 10 is light.

(2) Generation of Session Key Using Hash Function The terminal device 10 uses the session keys SK1 and SK2 as character strings obtained by hashing a character string obtained by connecting a unique ID to the terminal device 10 and a predetermined counter value. And The session key is given by h (unique ID + counter value) where h is a hash function. However, “+” represents a combination as a character string. Typical hash functions include MD5 (Message Digest 5) and SHA-1 (Secure Hash Algorithm 1), and any of them may be used. The counter value is a variable used so that a different session key can be obtained every time even in the same terminal device 10. For example, each time a session key is generated, the value is incremented by one.
Here, the input of the hash function includes the unique information of the terminal device 10, but since the hash function is an irreversible one-way function, the terminal device 10 is specified from the session keys SK1 and SK2 that are the outputs thereof. It is not possible to obtain high anonymity. Further, due to the nature of the hash function, it is possible to generate a session key that is unlikely to overlap with a session key generated from another unique ID (another terminal device) or another counter value.
Thus, the method of generating a session key using a hash function also has an advantage that the session key generation process in the terminal device 10 is light.
Note that variables other than the above-mentioned “unique ID + counter value” can be used as the input of the hash function. For example, the random number of (1) may be hashed and used as a session key.

(3) Generation of session key by encryption The terminal device 10 uses, as session keys SK1 and SK2, character strings obtained by encrypting a character string obtained by connecting a unique ID to the terminal device 10 and a predetermined counter value. . Any encryption method may be used as long as it is normally used in the field of information processing. The counter value is a variable used so that a different session key can be obtained every time even in the same terminal device 10. For example, each time a session key is generated, the value is incremented by one.
The session key generated by this method can obtain high anonymity by encryption and can be a session key that completely eliminates duplication with other session keys.

(4) Generation of Session Key in Reference Device The terminal device 10 requests the reference device 30 to issue a session key in advance, acquires the character string generated by the reference device 30, and uses the acquired character string as the session key. Let SK1 and SK2. As a method of generating a character string (session key) in the reference device 30, for example, the same method as in the above-described (1) to (3) is used. Since the reference device 30 itself generates a session key, it is possible to generate a session key so that duplication does not occur.

  FIG. 2 is a block diagram showing a configuration of the terminal device 10 in the content distribution system of FIG. The terminal device 10 includes a user input unit 101, a session key generation unit 102, a session key conversion unit 103, an infrared transmission processing unit 104, a network transmission processing unit 105, a content request processing unit 106, a network reception processing unit 107, and a display processing unit 108. , A display unit 109, an infrared transmission unit 110, and a network transmission / reception unit 111.

  The user input unit 101 is an interface that receives an operation input from a user. For example, a cursor key for selecting a menu or a command on the display screen (display unit 109) or a button assigned to a command for a specific purpose Etc. As the contents of the operation input from the user, the operation input for starting the acquisition of the content by transmitting infrared rays from the infrared transmission unit 110, the operation input for accessing the URL received from the reference device 30 and requesting the content are distributed. There is an operation input for changing the display state such as scrolling the displayed content by displaying the content on the display screen. When an operation input for infrared transmission is performed, a session key generation command is sent to the session key generation unit 102. When a content request operation input is performed, a content request command is sent to the content request processing unit 106.

  Session key generation unit 102 generates session keys SK1 and SK2 and passes them to session key conversion unit 103. As the method for generating the session key, which of the random numbers (1) to (3), the hash function, and the encryption to be used is set in advance, and the session key generation unit 102 uses the set algorithm. To generate a session key.

  Session key conversion unit 103 converts the session key generated by session key generation unit 102 into a data format of a signal transmitted from infrared transmission unit 110 or network transmission / reception unit 111, and transmits the converted session key SK1 by infrared transmission. The converted session key SK2 is output to the processing unit 104 to the network transmission processing unit 105, respectively.

  The infrared transmission processing unit 104 performs processing such as data modulation used for infrared communication on the input session key SK1, and transmits the processed session key SK1 from the infrared transmission unit 110 to the target device 20.

  The URL acquired from the reference device 30 from the network reception processing unit 107 is input to the content request processing unit 106. In accordance with the URL, the content request processing unit 106 generates content request data for requesting the content storage device 40 corresponding to the URL to deliver the target content, and the generated content request data is transmitted to the network transmission processing unit 105. Output to.

  The network transmission processing unit 105 converts the session key SK2 input from the session key conversion unit 103 and the content request data input from the content request processing unit 106 into data of a predetermined communication protocol. For example, when the terminal device 10 and the reference device 30 or the content storage device 40 are connected by a wireless LAN and TCP / IP (Transmission Control Protocol / Internet Protocol) is used as a communication protocol, an input data packet And header addition. The converted data is transmitted to the network transmission / reception unit 111, the session key SK2 is transmitted from the network transmission / reception unit 111 to the reference device 30, and the content request data is transmitted to the corresponding content storage device 40. The network transmission processing unit 105 also transmits address information on the network of the terminal device 10 from the network transmission / reception unit 111 to the reference device 30.

In addition to transmitting the above data, the network transmission / reception unit 111 receives data from the reference device 30 and the content storage device 40 and passes the received data to the network reception processing unit 107. The data from the reference device 30 is URL information indicating the storage location of the content related to the content distribution request, and the data from the content storage device 40 is the content to be distributed.
The network reception processing unit 107 performs processing such as header removal and packetized data reconstruction on the data input from the network transmission / reception unit 111. Among the processed data, URL information from the reference device 30 is sent to the content request processing unit 106 and the display processing unit 108, and content from the content storage device 40 is sent to the display processing unit 108.

The display processing unit 108 performs processing for causing the display unit 109 to display the input URL information and content. For example, if the content is encoded image data, it is decoded and output to the display unit 109, and if it is character data, it is output to the display unit 109 as character information.
The display unit 109 is a display device that displays data input from the display processing unit 108, and includes, for example, a liquid crystal panel.

  In addition, when audio data is included in the content to be distributed, an audio processing unit and a speaker for reproducing audio data may be provided.

FIG. 3 is an external view of the terminal device 10. A display unit 109 and a user input unit 101 are provided on the front surface of the terminal device 10, and an infrared transmission unit 110 and a network transmission / reception unit 111 are provided on the top surface.
Although not shown in detail in the user input unit 101, an infrared transmission button that is operated when content acquisition is started, a content request button that is operated when content distribution from the content storage device 40 is started, menu selection and distributed content Up / down / left / right cursor keys to be operated for browsing / scrolling are arranged. The network transmission / reception unit 111 is configured as a wireless antenna. When the user transmits the session key SK1 to the target device 20 by pressing the infrared transmission button, the operation is performed with the surface on which the infrared transmission unit 110 is provided facing the target device 20.

  FIG. 4 is a block diagram showing a configuration of the target device 20 in the content distribution system of FIG. The target device 20 includes an infrared reception unit 201, an infrared reception processing unit 202, a data generation unit 203, a spot information database 204, a state management unit 205, a network transmission processing unit 206, an output processing unit 207, and an image display unit 208. is doing.

The session key SK1 transmitted by infrared from the terminal device 10 is received by the infrared receiving unit 201, subjected to predetermined processing such as data demodulation by the infrared receiving processing unit 202, and input to the data generating unit 203.
The data generation unit 203 uses the received session key SK1, the context ID input from the state management unit 205, and the spot ID (ID unique to the target device 20) held in a storage unit (not shown) as a reference device. Transmission data to be transmitted to 30 is generated and output to the network transmission processing unit 206.

  The network transmission processing unit 206 converts the input transmission data into a predetermined communication protocol, and transmits the converted transmission data to the reference device 30. For example, when TCP / IP is used as a communication protocol, input data is packetized and a header is added.

  In the spot information database 204, context data that is information to be displayed on the image display unit 208 and a context ID that specifies context data are stored in association with each other. By preparing a plurality of context data, a large amount of information can be switched and displayed on one target device 20. FIG. 5 shows an example of the spot information database. In FIG. 5, for example, context ID “1” is assigned to context data “Context-A”. Although not shown, conditions for displaying the context data are predetermined for each context data. Examples of the “condition” include day of the week, weather, temperature, time, and the like. That is, the display of the image display unit 208 can be switched according to the day of the week, the weather, and the temperature. In addition, the display of the image display unit 208 can be switched at a constant cycle.

  The state management unit 205 manages switching of context data to be displayed on the image display unit 208. Specifically, the state management unit 205 selects and extracts context data from the spot information database 204 according to the above conditions. Then, the extracted context data is passed to the output processing unit 207 (display on the image display unit 208 is performed), and a context ID corresponding to the extracted context data is output to the data generation unit 203. Since different context data is selected under different conditions, the display of the image display unit 208 is switched. Further, the context ID input to the data generation unit 203, that is, the context ID transmitted to the reference device 30 indicates the current state of the target device 20 (display content of the image display unit 208).

  The output processing unit 207 performs processing for displaying the context data input from the state management unit 205 on the image display unit 208. The image display unit 208 is a display device that displays context data, and includes, for example, a liquid crystal panel or a plasma display panel.

  FIG. 6 is an external view of the target device 20. FIG. 6A shows an example of the flat display type target device 20, in which an infrared receiving unit 201 and an infrared light receiving display lamp 209 are installed above the image display unit 208. A user having the terminal device 10 operates the terminal device 10 toward the infrared receiving unit 201. The infrared light receiving display lamp 209 is a lamp that informs the user that data has been received by the infrared receiving unit 201, and lights up the lamp when receiving data in conjunction with the infrared receiving unit 201.

  FIG. 6B is an example of the target device 20 that does not have the image display unit 208. The main body of the target device 20 is incorporated in, for example, a pedestal on which an exhibit is placed, and an infrared receiving unit 201 and an infrared light receiving display lamp 209 similar to those in FIG. 6A are installed on the pedestal. If there is no image display unit 208, the context data and context ID are not used. Therefore, the target device 20 in FIG. 6B does not include the spot information database 204, and the data generation unit 203 has a session key SK1 and a spot ID (which is a unique ID of the target device and corresponds to the exhibit one-to-one). To the reference device 30 is generated.

  FIG. 7 is an example of a screen display in the target device 20 of FIG. The image display unit 208 of the target device 20 is provided with a moving image display area 2081, a still image display area 2082, a telop display area 2083, a web content display area 2084, and the like. The display of each of these areas is switched by the context data in the spot information database 204.

  FIG. 8 is a block diagram showing the configuration of the reference device 30 in the content distribution system of FIG. The reference device 30 includes a network reception processing unit 301, a network transmission processing unit 302, a session key management unit 303, a content determination unit 304, a session key database 305, and a content information database 306.

  The network reception processing unit 301 receives transmission data from the target device 20 including the session key SK 1, the spot ID, and the context ID, and passes it to the session key management unit 303. Also, the session key SK2 and the address of the terminal device 10 transmitted from the terminal device 10 are received, the session key SK2 is passed to the session key management unit 303, and the address of the terminal device 10 is passed to the content determination unit 304.

  The session key management unit 303 stores the session key SK1, the spot ID, and the context ID included in the received transmission data in the session key database 305 in association with each other. When the session key SK2 is received and input from the network reception processing unit 301, the session key SK1 in the session key database 305 is collated, and the input session key SK2 and each session key SK1 have a predetermined relationship. (As described above, here, it is determined whether or not the session keys SK1 and SK2 are the same). If a session key SK1 in the session key database 305 has the predetermined relationship, the spot ID and the context ID corresponding to the session key SK1 are output to the content determination unit 304.

  Here, FIG. 9 shows an example of data stored in the session key database 305. The session key database includes a session key field, a spot ID field, a context ID field, and an upd field. In the upd field, the time when the data is received from the target device 20 is recorded. In FIG. 9, for example, data in the first row is data relating to a content distribution request made in a state where an image display corresponding to context ID = 0 is performed in the target device having spot ID = 1, and the terminal device The session key transmitted from 10 is SK1 = fa03948591fcb629a124d0s6cba1962e729ca7b01, which indicates that the time when the data was received is 2006-06-05 15:22:35.

The content information database 306 stores, for each content specified by the spot ID and context ID, URL information indicating a location where the content is stored as information for acquiring the content.
The content determination unit 304 extracts the URL corresponding to the spot ID and context ID input from the session key management unit 303 from the content information database 306, and extracts the URL and the terminal device 10 input from the network reception processing unit 301. The address is output to the network transmission processing unit 302.
The network transmission processing unit 302 transmits the input URL to the terminal device 10 having the above address.

  FIG. 10 is an example of data stored in the content information database 306. In FIG. 10, for example, the URL of the content storage location corresponding to spot ID = 1 and context ID = 1 is “http://example.com/i/”. In this example of the content information database, the target device with spot ID = 1 has four context IDs, the target device with spot ID = 2 has one context ID, and the target device with spot ID = 3 It has 5 context IDs.

  FIG. 11 is a block diagram showing the configuration of the content storage device 40 in the content distribution system of FIG. The content storage device 40 includes a network reception processing unit 401, a content processing unit 402, a content database 403, and a network transmission processing unit 404.

  The network reception processing unit 401 receives content request data sent from the terminal device 10 and passes it to the content processing unit 402. The content processing unit 402 extracts the content corresponding to the URL specified by the content request data from the content database 403 and outputs it to the network transmission processing unit 404. The network transmission processing unit 404 transmits the content to the terminal device 10 that is the content request source. The content database 403 stores content corresponding to each URL.

  Next, the operation of the above-described content distribution system will be described with reference to FIGS. FIG. 12 is a sequence diagram showing processing until the terminal device 10 requests the content and acquires the target content in the content distribution system, and FIG. 13 is displayed on the display unit 109 of the terminal device 10 during this series of processing. It is an example of a screen to be displayed.

  The content distribution system starts its operation when the user presses the infrared transmission button of the terminal device 10. For example, when the user desires content related to information displayed on the image display unit 208 of the target device 20, the user goes near the target device 20 and moves the infrared transmission unit 110 of the terminal device 10 to the target device 20. The above infrared transmission button is pressed toward. At this time, an initial screen on which a message “please press the button” is displayed on the display unit 109 of the terminal device 10 as shown in FIG. 13A in the initial state.

  When receiving the operation input from the user by pressing the infrared transmission button, the terminal device 10 generates session keys SK1 and SK2 (step S101). Then, the session key SK1 is transmitted from the infrared transmission unit 110 to the target device 20 (step S102), and the session key SK2 and the address of the terminal device 10 are transmitted from the network transmission / reception unit 111 to the reference device 30 (step S105). At this time, a screen having a message “session key is being sent” is displayed on the display unit 109 of the terminal device 10 as shown in FIG.

  The target device 20 that has received the session key SK1 receives the received session key SK1, the spot ID stored in the storage unit, and the context ID corresponding to the context data displayed on the image display unit 208 when the session key is received. It transmits to the reference device 30 (step S103).

  The reference device 30 receives the session key SK1, spot ID, and context ID from the target device 20, and stores the received session key SK1, spot ID, and context ID in the session key database 305 in association with each other (step S104). Also, the session key SK2 sent from the terminal device 10 and the address of the terminal device 10 are received, and the received session key SK2 is collated with the session key SK1 stored in the session key database 305 in step S104. As a result of the collation, when a session key SK1 having a predetermined relationship with the session key SK2 (here, the relationship of SK1 = SK2 as described above) is obtained, the spot ID and context ID corresponding to the session key SK1 are obtained from the session key database 305. (Step S106).

  The reference device 30 further retrieves the URL corresponding to the retrieved spot ID and context ID from the content information database 306 by searching (step S107), and sends the retrieved URL to the terminal device 10 at the address received in step S105. Transmit (step S108).

  The terminal device 10 receives the URL transmitted from the reference device 30 and displays a content access screen as shown in FIG. 13C on the display unit 109 (step S109). This content access screen includes the received URL, a message that asks the user “Do you want to acquire content?”, Selection icons of “Yes” and “No”, and the like. Here, it is assumed that “Yes” confirmation input is performed by the user using the cursor key of the user input unit 101, the content request button, or the like.

Upon receiving the user input, the terminal device 10 transmits content request data to the content storage device 40 corresponding to the URL received in step S108 (step S110). At this time, the display unit 109 of the terminal device 10 displays a screen having a message “Content Accessing” as shown in FIG.
The content storage device 40 that has received the content request data retrieves the content corresponding to the URL specified by the received content request data from the content database 403 and transmits it to the terminal device 10 (step S111).
The terminal device 10 receives the above content transmitted from the content storage device 40, and displays the received content on the display unit 109 using a content display screen as shown in FIG. 13E (step S112).

  Thus, the distribution of the content from the content storage device 40 to the terminal device 10 is completed, and the operation of the content distribution system ends.

  As described above, according to the present embodiment, the terminal device 10 generates two session keys SK1 and SK2, transmits one session key SK1 to the reference device 30 via the target device 20, and the other session. The key SK2 is directly transmitted to the reference device 30, and the reference device 30 collates the session keys sent through two different paths. The session keys SK1 and SK2 are generated using random numbers, hash functions, or encryption so that the unique information of the terminal device 10 is not included, and only the address as the unique information of the terminal device 10 is directly transmitted to the reference device 30. . Therefore, the specific information of the terminal device 10 is not acquired by the target device 20, and the security of the terminal device 10 can be protected.

  In addition, when the target device 20 transmits the spot ID and the context ID to the reference device 30 and the session key can be collated, the URL corresponding to the spot ID and the context ID is transmitted to the terminal device 10. The terminal device 10 acquires content corresponding to the URL from the content storage device 40. The context ID is associated with the state of the target device 20, and by using this, different contents can be distributed for each state of the target device 20.

  Further, in communication between the terminal device 10 and the target device 20, only the session key SK1 is sent from the terminal device 10, so that the communication processing is simplified, a content distribution request can be made in a short time, and the transmission / reception unit The configuration can be simplified.

(Second Embodiment)
FIG. 14 is a configuration diagram showing an outline of a content distribution system according to the second embodiment of the present invention. The content distribution system of the present embodiment is different from the first embodiment in that the reference device 30 acquires content from the content storage device 40 and distributes the content to the terminal device 10. Note that the configurations of the terminal device 10, the target device 20, the reference device 30, and the content storage device 40 are the same as those in the first embodiment, and thus description thereof is omitted.

  14, the terminal device 10 generates two session keys SK1 and SK2, transmits one session key SK1 to the reference device 30 via the target device 20, and transmits the other session key SK2 to the reference device 30. Send directly. The terminal device 10 also transmits an address on the network of the terminal device 10 to the reference device 30 as information for specifying the terminal device 10. In addition to transferring the session key SK1 to the reference device 30, the target device 20 transmits a unique spot ID that identifies the target device 20 and a context ID that indicates the current state of the target device 20 to the reference device 30. The session keys SK1 and SK2 are generated using a random number, a hash function, or encryption as in the first embodiment.

  The session key SK1 is transmitted from the terminal device 10 to the target device 20 by infrared communication. Therefore, the user goes to the vicinity of the target device 20 with the terminal device 10 and performs a predetermined operation with the terminal device 10 facing the target device 20. In addition, communication is performed between the reference device 30, the terminal device 10, and the target device 20 via a wired LAN (Local Area Network), a wireless LAN, or another type of network (not shown).

  The reference device 30 that has received the session keys SK1 and SK2 sent via two different paths collates the two session keys and determines whether or not the session keys SK1 and SK2 have a predetermined relationship. To do. As an example of this “predetermined relationship”, the relationship that the session keys SK1 and SK2 are the same is applied here. In this example, the terminal device 10 generates two identical session keys SK1 and SK2 (that is, SK1 = SK2), and these are transmitted to the reference device 30 through different paths.

  When it is determined in the reference device 30 that the session keys SK1 and SK2 have the predetermined relationship, the reference device 30 indicates a location where the target content is stored as information for acquiring the content. Is retrieved from the content information database 306 and the content storage device 40 corresponding to the URL is requested to distribute the content. The URL is searched and determined from the content information database 306 according to the spot ID and context ID received from the target device 20.

  The content storage device 40 stores content to be distributed to the terminal device 10. The content storage device 40 that has received the content distribution request transmits the content corresponding to the URL to the reference device 30. Then, the reference device 30 distributes the target content to the terminal device 10 (identifies the terminal device 10 by the transmitted address).

FIG. 15 is a sequence diagram showing processing for distributing content in the content distribution system of the present embodiment.
The content distribution system starts its operation when the user presses the infrared transmission button of the terminal device 10. For example, when the user desires content related to information displayed on the image display unit 208 of the target device 20, the user goes near the target device 20 and moves the infrared transmission unit 110 of the terminal device 10 to the target device 20. The above infrared transmission button is pressed toward.

  When receiving the operation input from the user by pressing the infrared transmission button, the terminal device 10 generates session keys SK1 and SK2 (step S201). The session key SK1 is transmitted from the infrared transmission unit 110 to the target device 20 (step S202), and the session key SK2 and the address of the terminal device 10 are transmitted from the network transmission / reception unit 111 to the reference device 30 (step S205).

  The target device 20 that has received the session key SK1 receives the received session key SK1, the spot ID stored in the storage unit, and the context ID corresponding to the context data displayed on the image display unit 208 when the session key is received. It transmits to the reference device 30 (step S203).

  The reference device 30 receives the session key SK1, spot ID, and context ID from the target device 20, and stores the received session key SK1, spot ID, and context ID in the session key database 305 in association with each other (step S204). Also, the session key SK2 sent from the terminal device 10 and the address of the terminal device 10 are received, and the received session key SK2 is collated with the session key SK1 stored in the session key database 305 in step S204. As a result of the collation, when a session key SK1 having a predetermined relationship with the session key SK2 (here, the relationship of SK1 = SK2 as described above) is obtained, the spot ID and context ID corresponding to the session key SK1 are obtained from the session key database 305. (Step S206).

  The reference device 30 further retrieves the URL corresponding to the retrieved spot ID and context ID from the content information database 306 by searching (step S207), and is designated by the URL in the content storage device 40 corresponding to the retrieved URL. The distribution of the requested content is requested (step S208).

The content storage device 40 that has received the content distribution request extracts the content corresponding to the URL specified in the request from the content database 403 and transmits it to the reference device 30 (step S209). The reference device 30 transmits the content sent from the content storage device 40 to the terminal device 10 at the address received in step S205 (step S210).
The terminal device 10 receives the content transmitted from the reference device 30 and displays the received content on the display unit 109 (step S211).

  Thus, the distribution of the content from the content storage device 40 to the terminal device 10 is completed, and the operation of the content distribution system ends.

  As described above, according to the present embodiment, the terminal device 10 generates two session keys SK1 and SK2, transmits one session key SK1 to the reference device 30 via the target device 20, and the other session. The key SK2 is directly transmitted to the reference device 30, and the reference device 30 collates the session keys sent through two different paths. The session keys SK1 and SK2 are generated using random numbers, hash functions, or encryption so that the unique information of the terminal device 10 is not included, and only the address as the unique information of the terminal device 10 is directly transmitted to the reference device 30. . Therefore, the specific information of the terminal device 10 is not acquired by the target device 20, and the security of the terminal device 10 can be protected.

  Further, when the target device 20 transmits the spot ID and the context ID to the reference device 30 and the session key can be verified, the reference device 30 acquires the content corresponding to the spot ID and the context ID from the content storage device 40. Then, the data is transmitted to the terminal device 10. The context ID is associated with the state of the target device 20, and by using this, different contents can be distributed for each state of the target device 20.

(Third embodiment)
FIG. 16 is a block diagram showing an outline of a content distribution system according to the third embodiment of the present invention. The content distribution system according to the present embodiment is configured by the terminal device 10, the target device 20, and the reference device 30, stores the content in the reference device 30, and distributes the content from the reference device 30. This is different from the previous embodiment. Hereinafter, description will be made assuming that the content database 403 is provided in the reference device 30. The configurations of the terminal device 10 and the target device 20 are the same as those in the above-described embodiment.

  In FIG. 16, the terminal device 10 generates two session keys SK 1 and SK 2, transmits one session key SK 1 to the reference device 30 via the target device 20, and transmits the other session key SK 2 to the reference device 30. Send directly. The terminal device 10 also transmits an address on the network of the terminal device 10 to the reference device 30 as information for specifying the terminal device 10. In addition to transferring the session key SK1 to the reference device 30, the target device 20 transmits a unique spot ID that identifies the target device 20 and a context ID that indicates the current state of the target device 20 to the reference device 30. The session keys SK1 and SK2 are generated using a random number, a hash function, or encryption as in the above-described embodiment.

  The session key SK1 is transmitted from the terminal device 10 to the target device 20 by infrared communication. Therefore, the user goes to the vicinity of the target device 20 with the terminal device 10 and performs a predetermined operation with the terminal device 10 facing the target device 20. In addition, communication is performed between the reference device 30, the terminal device 10, and the target device 20 via a wired LAN (Local Area Network), a wireless LAN, or another type of network (not shown).

  The reference device 30 that has received the session keys SK1 and SK2 sent via two different paths collates the two session keys and determines whether or not the session keys SK1 and SK2 have a predetermined relationship. To do. As an example of this “predetermined relationship”, the relationship that the session keys SK1 and SK2 are the same is applied here. In this example, the terminal device 10 generates two identical session keys SK1 and SK2 (that is, SK1 = SK2), and these are transmitted to the reference device 30 through different paths.

  When it is determined in the reference device 30 that the session keys SK1 and SK2 have the predetermined relationship, the reference device 30 stores the target content as information for acquiring the content in the content database 403. The URL indicating the location is retrieved from the content information database 306. The URL is searched and determined from the content information database 306 according to the spot ID and context ID received from the target device 20. Then, the reference device 30 extracts the content corresponding to the URL from the content database 403 and distributes the extracted content to the terminal device 10 (identifies the terminal device 10 by the transmitted address).

FIG. 17 is a sequence diagram showing processing for distributing content in the content distribution system of this embodiment.
The content distribution system starts its operation when the user presses the infrared transmission button of the terminal device 10. For example, when the user desires content related to information displayed on the image display unit 208 of the target device 20, the user goes near the target device 20 and moves the infrared transmission unit 110 of the terminal device 10 to the target device 20. The above infrared transmission button is pressed toward.

  When receiving the operation input from the user by pressing the infrared transmission button, the terminal device 10 generates session keys SK1 and SK2 (step S301). Then, the session key SK1 is transmitted from the infrared transmission unit 110 to the target device 20 (step S302), and the session key SK2 and the address of the terminal device 10 are transmitted from the network transmission / reception unit 111 to the reference device 30 (step S305).

  The target device 20 that has received the session key SK1 receives the received session key SK1, the spot ID stored in the storage unit, and the context ID corresponding to the context data displayed on the image display unit 208 when the session key is received. It transmits to the reference device 30 (step S303).

  The reference device 30 receives the session key SK1, the spot ID, and the context ID from the target device 20, and stores the received session key SK1, spot ID, and context ID in the session key database 305 in association with each other (step S304). Also, the session key SK2 sent from the terminal device 10 and the address of the terminal device 10 are received, and the received session key SK2 is collated with the session key SK1 stored in the session key database 305 in step S304. As a result of the collation, when a session key SK1 having a predetermined relationship with the session key SK2 (here, the relationship of SK1 = SK2 as described above) is obtained, the spot ID and context ID corresponding to the session key SK1 are obtained from the session key database 305. (Step S306).

The reference device 30 further extracts the URL corresponding to the extracted spot ID and context ID from the content information database 306 by searching (step S307). Then, the content corresponding to the extracted URL is extracted from the content database 403 and transmitted to the terminal device 10 at the address received in step S305 (step S308).
The terminal device 10 receives the content transmitted from the reference device 30 and displays the received content on the display unit 109 (step S309).

  Thus, the distribution of the content from the reference device 30 to the terminal device 10 is completed, and the operation of the content distribution system ends.

  As described above, according to the present embodiment, the terminal device 10 generates two session keys SK1 and SK2, transmits one session key SK1 to the reference device 30 via the target device 20, and the other session. The key SK2 is directly transmitted to the reference device 30, and the reference device 30 collates the session keys sent through two different paths. The session keys SK1 and SK2 are generated using random numbers, hash functions, or encryption so that the unique information of the terminal device 10 is not included, and only the address as the unique information of the terminal device 10 is directly transmitted to the reference device 30. . Therefore, the specific information of the terminal device 10 is not acquired by the target device 20, and the security of the terminal device 10 can be protected.

  Further, when the target device 20 transmits the spot ID and the context ID to the reference device 30 and the session key can be collated, the reference device 30 selects the content corresponding to the spot ID and the context ID in the reference device 30. The data is extracted from the database 403 and transmitted to the terminal device 10. The context ID is associated with the state of the target device 20, and by using this, different contents can be distributed for each state of the target device 20.

(Fourth embodiment)
FIG. 18 is a configuration diagram showing an outline of a content distribution system according to the fourth embodiment of the present invention. The content distribution system according to the present embodiment transmits the URL indicating the location where the target content is stored instead of the spot ID and the context ID from the target device 20 to the reference device 30 as described above. Different from form. Therefore, the spot information database 204 of the target device 20 is configured to store the URL instead of the context ID as data associated with the context data. In addition, the reference device 30 changes the configuration so that the session key database 305 stores the session key received from the target device 20 in association with the URL, and does not include the content determination unit 304 and the content information database 306. The configurations of the terminal device 10 and the content storage device 40 are the same as those in the first embodiment.

  In FIG. 18, the terminal device 10 generates two session keys SK1 and SK2, transmits one session key SK1 to the reference device 30 via the target device 20, and transmits the other session key SK2 to the reference device 30. Send directly. The terminal device 10 also transmits an address on the network of the terminal device 10 to the reference device 30 as information for specifying the terminal device 10. In addition to transferring the session key SK1 to the reference device 30, the target device 20 transmits a URL indicating the location where the target content is stored to the reference device 30 as information for the terminal device 10 to acquire the content. The session keys SK1 and SK2 are generated using a random number, a hash function, or encryption as in the above-described embodiment.

  The session key SK1 is transmitted from the terminal device 10 to the target device 20 by infrared communication. Therefore, the user goes to the vicinity of the target device 20 with the terminal device 10 and performs a predetermined operation with the terminal device 10 facing the target device 20. In addition, communication is performed between the reference device 30, the terminal device 10, and the target device 20 via a wired LAN (Local Area Network), a wireless LAN, or another type of network (not shown).

  The reference device 30 that has received the session keys SK1 and SK2 sent via two different paths collates the two session keys and determines whether or not the session keys SK1 and SK2 have a predetermined relationship. To do. As an example of this “predetermined relationship”, the relationship that the session keys SK1 and SK2 are the same is applied here. In this example, the terminal device 10 generates two identical session keys SK1 and SK2 (that is, SK1 = SK2), and these are transmitted to the reference device 30 through different paths.

  When it is determined in the reference device 30 that the session keys SK1 and SK2 have the predetermined relationship, the reference device 30 sends the URL received from the target device 20 to the terminal device 10 (the terminal device 10 based on the transmitted address). To identify). The content distributed to the terminal device 10 is stored in the content storage device 40. The terminal device 10 that has received the URL accesses the content storage device 40 corresponding to the URL and requests content. In response to this request, the content storage device 40 distributes the target content to the terminal device 10.

FIG. 19 is a sequence diagram showing processing for distributing content in the content distribution system of the present embodiment.
The content distribution system starts its operation when the user presses the infrared transmission button of the terminal device 10. For example, when the user desires content related to information displayed on the image display unit 208 of the target device 20, the user goes near the target device 20 and moves the infrared transmission unit 110 of the terminal device 10 to the target device 20. The above infrared transmission button is pressed toward.

  When receiving the operation input from the user by pressing the infrared transmission button, the terminal device 10 generates session keys SK1 and SK2 (step S401). Then, the session key SK1 is transmitted from the infrared transmission unit 110 to the target device 20 (step S402), and the session key SK2 and the address of the terminal device 10 are transmitted from the network transmission / reception unit 111 to the reference device 30 (step S405).

  The target device 20 that has received the session key SK1 refers to the received session key SK1 and the URL held in the spot information database 204 corresponding to the context data displayed on the image display unit 208 when the session key was received. 30 (step S403).

  The reference device 30 receives the session key SK1 and the URL from the target device 20, and stores the received session key SK1 and URL in the session key database 305 in association with each other (step S404). Also, the session key SK2 sent from the terminal device 10 and the address of the terminal device 10 are received, and the received session key SK2 is collated with the session key SK1 stored in the session key database 305 in step S404. As a result of the collation, when a session key SK1 having a predetermined relationship with the session key SK2 (here, the relationship of SK1 = SK2 as described above) is obtained, the URL corresponding to the session key SK1 is extracted from the session key database 305 (step S406).

  The reference device 30 further transmits the extracted URL to the terminal device 10 at the address received in step S405 (step S407). The terminal device 10 receives the above URL transmitted from the reference device 30, displays a content access screen on the display unit 109 (step S408), and waits for a confirmation input from the user. When receiving the user's confirmation input, the terminal device 10 transmits the content request data to the content storage device 40 corresponding to the URL received in step S407 (step S409).

The content storage device 40 that has received the content request data retrieves the content corresponding to the URL specified by the received content request data from the content database 403 and transmits it to the terminal device 10 (step S410).
The terminal device 10 receives the content transmitted from the content storage device 40, and displays the received content on the display unit 109 (step S411).

  Thus, the distribution of the content from the content storage device 40 to the terminal device 10 is completed, and the operation of the content distribution system ends.

  As described above, according to the present embodiment, the terminal device 10 generates two session keys SK1 and SK2, transmits one session key SK1 to the reference device 30 via the target device 20, and the other session. The key SK2 is directly transmitted to the reference device 30, and the reference device 30 collates the session keys sent through two different paths. The session keys SK1 and SK2 are generated using random numbers, hash functions, or encryption so that the unique information of the terminal device 10 is not included, and only the address as the unique information of the terminal device 10 is directly transmitted to the reference device 30. . Therefore, the specific information of the terminal device 10 is not acquired by the target device 20, and the security of the terminal device 10 can be protected.

  When the URL corresponding to the context data displayed on the image display unit 208 when the session key is received from the target device 20 is transmitted to the reference device 30 and the session key can be verified, the URL from the reference device 30 Is transmitted to the terminal device 10. The terminal device 10 acquires content corresponding to the URL from the content storage device 40. Therefore, it is possible to distribute different contents for each state of the target device 20.

(Fifth embodiment)
FIG. 20 is a configuration diagram showing an outline of a content distribution system according to the fifth embodiment of the present invention. In the content distribution system of the present embodiment, the reference device 30 acquires content from the content storage device 40 and distributes the content to the terminal device 10, and instead of the spot ID and context ID from the target device 20 to the reference device 30. The point which transmitted URL which shows the place where the target content is stored differs from the above-mentioned embodiment. Therefore, the spot information database 204 of the target device 20 is configured to store the URL instead of the context ID as data associated with the context data. In addition, the reference device 30 changes the configuration so that the session key database 305 stores the session key received from the target device 20 in association with the URL, and does not include the content determination unit 304 and the content information database 306. The configurations of the terminal device 10 and the content storage device 40 are the same as those in the first embodiment.

  20, the terminal device 10 generates two session keys SK1 and SK2, transmits one session key SK1 to the reference device 30 via the target device 20, and transmits the other session key SK2 to the reference device 30. Send directly. The terminal device 10 also transmits an address on the network of the terminal device 10 to the reference device 30 as information for specifying the terminal device 10. In addition to transferring the session key SK1 to the reference device 30, the target device 20 transmits a URL indicating the location where the target content is stored to the reference device 30 as information for the terminal device 10 to acquire the content. The session keys SK1 and SK2 are generated using a random number, a hash function, or encryption as in the above-described embodiment.

  The session key SK1 is transmitted from the terminal device 10 to the target device 20 by infrared communication. Therefore, the user goes to the vicinity of the target device 20 with the terminal device 10 and performs a predetermined operation with the terminal device 10 facing the target device 20. In addition, communication is performed between the reference device 30, the terminal device 10, and the target device 20 via a wired LAN (Local Area Network), a wireless LAN, or another type of network (not shown).

  The reference device 30 that has received the session keys SK1 and SK2 sent via two different paths collates the two session keys and determines whether or not the session keys SK1 and SK2 have a predetermined relationship. To do. As an example of this “predetermined relationship”, the relationship that the session keys SK1 and SK2 are the same is applied here. In this example, the terminal device 10 generates two identical session keys SK1 and SK2 (that is, SK1 = SK2), and these are transmitted to the reference device 30 through different paths.

  When the reference device 30 determines that the session keys SK1 and SK2 have the predetermined relationship, the reference device 30 requests the content storage device 40 corresponding to the URL received from the target device 20 to distribute the content. . The content storage device 40 stores content to be distributed to the terminal device 10. The content storage device 40 that has received the content distribution request transmits the content corresponding to the URL to the reference device 30. Then, the reference device 30 distributes the target content to the terminal device 10 (identifies the terminal device 10 by the transmitted address).

FIG. 21 is a sequence diagram showing processing for distributing content in the content distribution system of the present embodiment.
The content distribution system starts its operation when the user presses the infrared transmission button of the terminal device 10. For example, when the user desires content related to information displayed on the image display unit 208 of the target device 20, the user goes near the target device 20 and moves the infrared transmission unit 110 of the terminal device 10 to the target device 20. The above infrared transmission button is pressed toward.

  When receiving the operation input from the user by pressing the infrared transmission button, the terminal device 10 generates session keys SK1 and SK2 (step S501). Then, the session key SK1 is transmitted from the infrared transmission unit 110 to the target device 20 (step S502), and the session key SK2 and the address of the terminal device 10 are transmitted from the network transmission / reception unit 111 to the reference device 30 (step S505).

  The target device 20 that has received the session key SK1 refers to the received session key SK1 and the URL held in the spot information database 204 corresponding to the context data displayed on the image display unit 208 when the session key was received. 30 (step S503).

  The reference device 30 receives the session key SK1 and the URL from the target device 20, and stores the received session key SK1 and URL in the session key database 305 in association with each other (step S504). Also, the session key SK2 sent from the terminal device 10 and the address of the terminal device 10 are received, and the received session key SK2 is collated with the session key SK1 stored in the session key database 305 in step S504. As a result of the collation, when a session key SK1 having a predetermined relationship with the session key SK2 (here, the relationship of SK1 = SK2 as described above) is obtained, the URL corresponding to the session key SK1 is extracted from the session key database 305 (step S506).

The reference device 30 further requests the content storage device 40 corresponding to the extracted URL to distribute the content specified by the URL (step S507).
The content storage device 40 that has received the content distribution request extracts the content corresponding to the URL specified in the request from the content database 403 and transmits it to the reference device 30 (step S508). The reference device 30 transmits the content sent from the content storage device 40 to the terminal device 10 at the address received in step S505 (step S509).
The terminal device 10 receives the content transmitted from the reference device 30 and displays the received content on the display unit 109 (step S510).

  Thus, the distribution of the content from the content storage device 40 to the terminal device 10 is completed, and the operation of the content distribution system ends.

  As described above, according to the present embodiment, the terminal device 10 generates two session keys SK1 and SK2, transmits one session key SK1 to the reference device 30 via the target device 20, and the other session. The key SK2 is directly transmitted to the reference device 30, and the reference device 30 collates the session keys sent through two different paths. The session keys SK1 and SK2 are generated using random numbers, hash functions, or encryption so that the unique information of the terminal device 10 is not included, and only the address as the unique information of the terminal device 10 is directly transmitted to the reference device 30. . Therefore, the specific information of the terminal device 10 is not acquired by the target device 20, and the security of the terminal device 10 can be protected.

  In addition, when the URL corresponding to the context data displayed on the image display unit 208 when receiving the session key from the target device 20 is transmitted to the reference device 30 and the session key can be verified, the content corresponding to the URL Is acquired from the content storage device 40 and transmitted to the terminal device 10. Therefore, it is possible to distribute different contents for each state of the target device 20.

(Sixth embodiment)
FIG. 22 is a block diagram showing an outline of a content distribution system according to the sixth embodiment of the present invention. The content distribution system according to the present embodiment includes a terminal device 10, a target device 20, and a reference device 30, stores content in the target device 20, and distributes the content via the reference device 30. However, this is different from the above-described embodiment. Therefore, the target device 20 is configured to include the content database 403. The reference device 30 changes the configuration so that the session key database 305 stores only the session key and upd, and does not include the content determination unit 304 and the content information database 306. The configuration of the terminal device 10 is the same as that in the first embodiment.

  22, the terminal device 10 generates two session keys SK1 and SK2, transmits one session key SK1 to the reference device 30 via the target device 20, and transmits the other session key SK2 to the reference device 30. Send directly. The terminal device 10 also transmits an address on the network of the terminal device 10 to the reference device 30 as information for specifying the terminal device 10. In addition to transferring the session key SK1 to the reference device 30, the target device 20 transmits the target content to the reference device 30. The session keys SK1 and SK2 are generated using a random number, a hash function, or encryption as in the above-described embodiment.

  The session key SK1 is transmitted from the terminal device 10 to the target device 20 by infrared communication. Therefore, the user goes to the vicinity of the target device 20 with the terminal device 10 and performs a predetermined operation with the terminal device 10 facing the target device 20. In addition, communication is performed between the reference device 30, the terminal device 10, and the target device 20 via a wired LAN (Local Area Network), a wireless LAN, or another type of network (not shown).

  The reference device 30 that has received the session keys SK1 and SK2 sent via two different paths collates the two session keys and determines whether or not the session keys SK1 and SK2 have a predetermined relationship. To do. As an example of this “predetermined relationship”, the relationship that the session keys SK1 and SK2 are the same is applied here. In this example, the terminal device 10 generates two identical session keys SK1 and SK2 (that is, SK1 = SK2), and these are transmitted to the reference device 30 through different paths.

  When it is determined in the reference device 30 that the session keys SK1 and SK2 have the predetermined relationship, the reference device 30 transmits the content received from the target device 20 to the terminal device 10 (the terminal device 10 based on the transmitted address). To identify).

FIG. 23 is a sequence diagram showing processing for distributing content in the content distribution system of the present embodiment.
The content distribution system starts its operation when the user presses the infrared transmission button of the terminal device 10. For example, when the user desires content related to information displayed on the image display unit 208 of the target device 20, the user goes near the target device 20 and moves the infrared transmission unit 110 of the terminal device 10 to the target device 20. The above infrared transmission button is pressed toward.

  When receiving the operation input from the user by pressing the infrared transmission button, the terminal device 10 generates session keys SK1 and SK2 (step S601). Then, the session key SK1 is transmitted from the infrared transmission unit 110 to the target device 20 (step S602), and the session key SK2 and the address of the terminal device 10 are transmitted from the network transmission / reception unit 111 to the reference device 30 (step S605).

  The target device 20 that has received the session key SK1 refers to the received session key SK1 and the content stored in the content database 403 corresponding to the context data displayed on the image display unit 208 when the session key is received. 30 (step S603).

  The reference device 30 receives the session key SK1 and the content from the target device 20, and stores the received session key SK1 and the content in the session key database 305 in association with each other (step S604). In addition, the session key SK2 sent from the terminal device 10 and the address of the terminal device 10 are received, and the received session key SK2 is collated with the session key SK1 stored in the session key database 305 in step S604. When a session key SK1 having a predetermined relationship with the session key SK2 is obtained as a result of the collation (here, SK1 = SK2 as described above), the content corresponding to the session key SK1 is extracted from the session key database 305 (step In step S606), the content is transmitted to the terminal device 10 having the address received in step S605 (step S607).

  The terminal device 10 receives the content transmitted from the reference device 30 and displays the received content on the display unit 109 (step S608).

  Thus, the distribution of the content from the target device 20 to the terminal device 10 is completed, and the operation of the content distribution system ends.

  As described above, according to the present embodiment, the terminal device 10 generates two session keys SK1 and SK2, transmits one session key SK1 to the reference device 30 via the target device 20, and the other session. The key SK2 is directly transmitted to the reference device 30, and the reference device 30 collates the session keys sent through two different paths. The session keys SK1 and SK2 are generated using random numbers, hash functions, or encryption so that the unique information of the terminal device 10 is not included, and only the address as the unique information of the terminal device 10 is directly transmitted to the reference device 30. . Therefore, the specific information of the terminal device 10 is not acquired by the target device 20, and the security of the terminal device 10 can be protected.

  In addition, when the content corresponding to the context data displayed on the image display unit 208 when the session key is received from the target device 20 is transmitted to the reference device 30 and the session key can be collated, the content is transferred from the reference device 30 to the content. Is distributed to the terminal device 10. Therefore, it is possible to distribute different contents for each state of the target device 20.

(Seventh embodiment)
Next, a content distribution system according to a seventh embodiment of the present invention will be described. The content distribution system according to the present embodiment normally operates even when the reference device 30 receives the session key SK2 sent directly from the terminal device 10 before receiving the session key SK1 sent via the target device 20. The content can be distributed. The content distribution system according to the present embodiment can be applied to any of the configurations shown in FIGS. 1, 14, 16, 18, 20, 20, and 22 described above, but in the following, the configuration shown in FIG. The description will be made based on the first embodiment.

  Specifically, in the present embodiment, the terminal device 10 also transmits a predetermined communication address to the reference device 30 together with the session key SK2. The reference device 30 receives and stores the session key SK2 and the communication address (arriving before the session key SK1), and when the session key SK1 is received, the session key SK1 and the session key SK2 Perform verification. By doing so, even when the session key SK1 does not arrive at the reference device 30 first, the session key can be verified and the content can be distributed.

  Here, the communication address transmitted together with the session key SK2 may be a unique address of the terminal device 10 itself, or another terminal device address (for example, at home). It may be an e-mail address used on the installed computer). When the address of the home computer is designated as the communication address and sent to the reference device 30, the content distributed from the reference device 30 can be acquired by the home computer.

  FIG. 24 is a sequence diagram illustrating processing until the terminal device 10 requests content and acquires target content in the content distribution system of the present embodiment. The operation of the content distribution system of the present embodiment will be described with reference to FIG.

  When the terminal device 10 receives an operation input from the user by pressing the infrared transmission button, the terminal device 10 generates session keys SK1 and SK2 (step S701). First, the session key SK2 and the address of the terminal device 10 are transmitted from the network transmission / reception unit 111 to the reference device 30 (step S702), and then the session key SK1 is transmitted from the infrared transmission unit 110 to the target device 20 (step S704). .

  The reference device 30 receives and stores the session key SK2 and the address of the terminal device 10 sent from the terminal device 10 (step S703). The target device 20 receives the session key SK1 from the terminal device 10, and the received session key SK1, the spot ID held in the storage unit, and the context displayed on the image display unit 208 when the session key is received The context ID corresponding to the data is transmitted to the reference device 30 (step S705).

  When the above data is received from the target device 20, the reference device 30 stores the received session key SK1, spot ID, and context ID in association with each other in the session key database 305 (step S706) and the stored session. The key SK2 is compared with the received session key SK1. As a result of the collation, if the session key SK1 and the session key SK2 satisfy a predetermined relationship (here, the relationship of SK1 = SK2 as described above), the reference device 30 determines the spot ID and context corresponding to the session key SK1. The ID is extracted from the session key database 305 (step S707).

  The reference device 30 further retrieves the URL corresponding to the retrieved spot ID and context ID from the content information database 306 by searching (step S708), and sends the retrieved URL to the terminal device 10 at the address received in step S703. Transmit (step S709).

  The terminal device 10 receives the URL transmitted from the reference device 30 and displays a content access screen as shown in FIG. 13C on the display unit 109 (step S710). In response to the input from the user, the terminal device 10 transmits content request data to the content storage device 40 corresponding to the received URL (step S711).

The content storage device 40 that has received the content request data retrieves the content corresponding to the URL specified by the received content request data from the content database 403 and transmits it to the terminal device 10 (step S712).
The terminal device 10 receives the content transmitted from the content storage device 40, and displays the received content on the display unit 109 using a content display screen as shown in FIG. 13E (step S713).

  Thus, even when the session key SK2 is first received by the reference device 30, the content is distributed from the content storage device 40 to the terminal device 10. As long as the session key SK2 is stored in the reference device 30, the time difference in which the session key SK1 and the session key SK2 are received by the reference device 30 is not particularly limited. In addition, when the reference device 30 receives the session key SK1 first, the content distribution system executes processing according to the sequence of FIG. 12, and when it receives the session key SK2 first, executes processing according to the sequence of FIG. As described above, the configuration may be such that the processing can be selectively executed. By doing so, the content can be distributed regardless of which session key arrives at the reference device 30 first.

(Eighth embodiment)
Next, a content distribution system according to an eighth embodiment of the present invention will be described. In the content distribution system of the present embodiment, user attribute information is transmitted from the terminal device 10 to the target device 20, and the content to be distributed is changed according to the attribute information. Here, as user attribute information, such as gender, age, occupation, blood type, date of birth, etc., which are information that is difficult to specify in order to avoid the user or terminal device 10 being specified by the target device 20 Use information. User attribute information is registered in advance in the terminal device 10 by a user operation.

  The content distribution system according to the present embodiment can be applied to any of the configurations shown in FIGS. 1, 14, 16, 18, 20, 20, and 22 described above, but in the following, the configuration shown in FIG. The description will be made based on (first embodiment) (however, the target device 20 does not transmit a context ID to the reference device 30).

  FIG. 25 is an example of an attribute information registration screen displayed on the display unit 109 when the terminal device 10 registers user attribute information. In the example shown in the figure, the attribute information registration screen is provided with input areas for inputting gender, age, and occupation, and the user input unit 101 is used to select input items and input contents as appropriate. Thus, user input is possible. In this screen example, male, male, 20s, and office worker are selected as the gender, respectively. The input content selected here is registered in the terminal device 10 as user attribute information.

  FIG. 26 is an example of data stored in the content information database 306 of the reference device 30 in the present embodiment. In this example of the content information database, the target device with spot ID = 1 uses gender as the target of attribute information, the target device with spot ID = 2 uses age as the target of attribute information, and the target device with spot ID = 3 Gender and age are targeted for attribute information. For example, when a user (terminal device 10) whose attribute information is male accesses the target device with spot ID = 1, the URL of the corresponding content storage location is “http://www.male.jp/”. Is transmitted from the reference device 30 to the terminal device 10.

  FIG. 27 is a sequence diagram illustrating processing until the terminal device 10 requests content and acquires target content in the content distribution system of the present embodiment. The operation of the content distribution system of the present embodiment will be described with reference to FIG.

  Upon receiving an operation input from the user by pressing the infrared transmission button, the terminal device 10 generates session keys SK1 and SK2 (step S801). Then, the session key SK1 and the user attribute information registered in the terminal device 10 are transmitted from the infrared transmission unit 110 to the target device 20 (step S802), and the session key SK2 and the address of the terminal device 10 are transmitted to the network transmission / reception unit. The data is transmitted from 111 to the reference device 30 (step S805).

  The target device 20 that has received the session key SK1 and the attribute information transmits the received session key SK1, the attribute information, and the spot ID held in the storage unit to the reference device 30 (step S803).

  The reference device 30 receives the session key SK1, attribute information, and spot ID from the target device 20, and stores the received session key SK1, attribute information, and spot ID in the session key database 305 in association with each other (step S804). Also, the session key SK2 sent from the terminal device 10 and the address of the terminal device 10 are received, and the received session key SK2 is collated with the session key SK1 stored in the session key database 305 in step S804. As a result of the collation, when a session key SK1 having a predetermined relationship with the session key SK2 (here, the relationship of SK1 = SK2 as described above) is obtained, the spot ID and attribute information corresponding to the session key SK1 are stored in the session key database 305. (Step S806).

  The reference device 30 further retrieves the URL corresponding to the extracted spot ID and attribute information from the content information database 306 of FIG. 26 by searching (step S807), and the terminal device having the address received in step S805. 10 is transmitted to 10 (step S808).

  The terminal device 10 receives the URL transmitted from the reference device 30 and displays a content access screen as shown in FIG. 13C on the display unit 109 (step S809). Then, the terminal device 10 transmits the content request data to the content storage device 40 corresponding to the URL received in step S808 in response to the user input (step S810).

The content storage device 40 that has received the content request data retrieves the content corresponding to the URL specified by the received content request data from the content database 403 and transmits it to the terminal device 10 (step S811).
The terminal device 10 receives the content transmitted from the content storage device 40, and displays the received content on the display unit 109 using a content display screen as shown in FIG. 13E (step S812).

  In this way, the content corresponding to the user attribute information is distributed from the content storage device 40 to the terminal device 10.

Although the user attribute information is transmitted to the target device 20 in the sequence of FIG. 27 described above, the user attribute information can also be directly transmitted to the reference device 30.
FIG. 28 is a sequence diagram illustrating a modification in which user attribute information is transmitted to the reference device 30 in the present embodiment. The operation of the content distribution system in this case will be described with reference to FIG.

  When receiving the operation input from the user by pressing the infrared transmission button, the terminal device 10 generates session keys SK1 and SK2 (step S901). Then, the session key SK1 is transmitted from the infrared transmission unit 110 to the target device 20 (step S902), and the network transmission / reception unit 111 transmits the session key SK2, the address of the terminal device 10, and the user attribute information registered in the terminal device 10. To the reference device 30 (step S905).

  The target device 20 that has received the session key SK1 transmits the received session key SK1 and the spot ID held in the storage unit to the reference device 30 (step S903).

  The reference device 30 receives the session key SK1 and the spot ID from the target device 20, and stores the received session key SK1 and the spot ID in the session key database 305 in association with each other (step S904). Also, the session key SK2 sent from the terminal device 10, the address of the terminal device 10, and attribute information are received, and the received session key SK2 is collated with the session key SK1 stored in the session key database 305 in step S904. As a result of the collation, when a session key SK1 having a predetermined relationship with the session key SK2 (here, the relationship of SK1 = SK2 as described above) is obtained, the spot ID corresponding to the session key SK1 is extracted from the session key database 305 ( Step S906).

  The reference device 30 further retrieves the URL corresponding to the extracted spot ID and the attribute information transmitted and received from the terminal device 10 from the content information database 306 of FIG. 26 by searching (step S907). The URL is transmitted to the terminal device 10 at the address received in step S905 (step S908).

  The terminal device 10 receives the URL transmitted from the reference device 30 and displays a content access screen as shown in FIG. 13C on the display unit 109 (step S909). Then, the terminal device 10 transmits the content request data to the content storage device 40 corresponding to the URL received in step S908 in response to the user input (step S910).

The content storage device 40 that has received the content request data retrieves the content corresponding to the URL specified by the received content request data from the content database 403 and transmits it to the terminal device 10 (step S911).
The terminal device 10 receives the content transmitted from the content storage device 40, and displays the received content on the display unit 109 using a content display screen as shown in FIG. 13E (step S912).

  In this way, the content corresponding to the user attribute information is distributed from the content storage device 40 to the terminal device 10.

The embodiments of the present invention have been described in detail above with reference to the drawings. However, the specific configuration is not limited to the above-described one, and various design changes and the like can be made without departing from the scope of the present invention. Is possible.
For example, in the above-described embodiment, the case where a URL is used as “information for acquiring content” has been described. However, other than the URL may be used as long as the content can be specified. As an example of “information for acquiring content” other than the URL, an IP (Internet Protocol) address, a file name, uniquely set pointer information, and the like can be used.

  Further, the case where the session key SK1 and SK2 are the same as the “predetermined relationship” when the session key SK1 and SK2 are collated in the reference device 30 has been described. If it is possible to determine that keys SK1 and SK2 have been transmitted (if session keys SK1 and SK2 are associated with each other), session keys SK1 and SK2 having other relationships can be used. For example, it is conceivable that the hash value of the session key SK2 is set as the session key SK1, and in this case, even if one of the session keys is wiretapped, “impersonation” by the eavesdropper is impossible. The security of the content distribution system can be improved. Alternatively, SK1 may be obtained by adding a certain character string to SK2 (eg, SK1 = SK2 + 1).

In addition, the target device 20 in the present invention is not limited to the one provided with the image display unit 208, and as shown in FIG. 6B described above, exhibits such as paintings, sculptures, and advertisements A target device 20 of a type that is installed nearby and does not display an image by itself is also included.
Further, in addition to displaying the distributed content on the display unit 109, the terminal device 10 may store the content in a built-in memory or send the content to a home server device via a network for storage. Can be. Further, the distributed content may be reproduced as audio content from a speaker or the like newly provided in the terminal device 10.

  Further, communication is performed between the terminal device 10 and the reference device 30, the target device 20 and the reference device 30, the terminal device 10 and the content storage device 40, and the reference device 30 and the content storage device 40 by a communication function that can be used by the computer. The type of communication function does not matter. For example, wired connections such as Ethernet (registered trademark), RS-232C (Recommended Standard 232C), USB (Universal Serial Bus), IEEE 1394 (Institute of Electrical and Electronics Engineers 1394), and E (80). This includes wireless communication such as mobile phone communication, infrared communication, Bluetooth, and optical transmission.

  Moreover, although each said communication function can be used also for communication between the terminal device 10 and the object apparatus 20, it is suitable if it uses especially infrared communication, Bluetooth, and optical transmission.

It is a block diagram which shows the outline | summary of the content delivery system by the 1st Embodiment of this invention. It is a block diagram which shows the structure of the terminal device in a content delivery system. It is an external view of a terminal device. It is a block diagram which shows the structure of the object apparatus in a content delivery system. It is an example of a spot information database. It is an external view of an object apparatus. It is an example of the screen display in an object apparatus. It is a block diagram which shows the structure of the reference apparatus in a content delivery system. It is an example of a session key database. It is an example of a content information database. It is a block diagram which shows the structure of the content storage apparatus in a content delivery system. It is a sequence diagram which shows the process of the content delivery system by the 1st Embodiment of this invention. It is an example of a screen displayed on the display part of a terminal device. It is a block diagram which shows the outline | summary of the content delivery system by the 2nd Embodiment of this invention. It is a sequence diagram which shows the process of the content delivery system by the 2nd Embodiment of this invention. It is a block diagram which shows the outline | summary of the content delivery system by the 3rd Embodiment of this invention. It is a sequence diagram which shows the process of the content delivery system by the 3rd Embodiment of this invention. It is a block diagram which shows the outline | summary of the content delivery system by the 4th Embodiment of this invention. It is a sequence diagram which shows the process of the content delivery system by the 4th Embodiment of this invention. It is a block diagram which shows the outline | summary of the content delivery system by the 5th Embodiment of this invention. It is a sequence diagram which shows the process of the content delivery system by the 5th Embodiment of this invention. It is a block diagram which shows the outline | summary of the content delivery system by the 6th Embodiment of this invention. It is a sequence diagram which shows the process of the content delivery system by the 6th Embodiment of this invention. It is a sequence diagram which shows the process of the content delivery system by the 7th Embodiment of this invention. It is an example of the attribute information registration screen displayed on the display part of a terminal device. It is an example of the content information database in the 7th Embodiment of this invention. It is a sequence diagram which shows the process of the content delivery system by the 8th Embodiment of this invention. It is a sequence diagram which shows the modification of the process of the content delivery system by the 8th Embodiment of this invention.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 10 ... Terminal device 20 ... Target apparatus 30 ... Reference apparatus 40 ... Content storage apparatus 101 ... User input part 102 ... Session key generation part 103 ... Session key conversion part 104 ... Infrared transmission processing part 105 ... Network transmission processing part 106 ... Content request Processing unit 107: Network reception processing unit 108 ... Display processing unit 109 ... Display unit 110 ... Infrared transmission unit 111 ... Network transmission / reception unit 201 ... Infrared reception unit 202 ... Infrared reception processing unit 203 ... Data generation unit 204 ... Spot information database 205 ... State management unit 206 ... Network transmission processing unit 207 ... Output processing unit 208 ... Image display unit 301 ... Network reception processing unit 302 ... Network transmission processing unit 303 ... Session key management unit 304 ... Content determination unit 30 ... session key database 306 ... content information database 401 ... network reception processing unit 402 ... content processing unit 403 ... content database 404 ... network transmission processing unit

Claims (26)

A second signal including a second session key associated with the first session key, the first signal including a first session key configured as a unique bit string not including information identifying the terminal device; A terminal device that transmits
A target device that receives the first signal and transmits a third signal including a first session key included in the first signal;
A reference device for receiving the second signal and the third signal and determining a correspondence between the first session key and the second session key included in the received signals;
When it is determined that the association is correct, the content specified in accordance with the first signal is distributed to the terminal device. A second signal including a second session key associated with the first session key, the first signal including a first session key configured as a unique bit string not including information identifying the terminal device; , Receiving a fourth signal including information for acquiring the content, transmitting a fifth signal requesting distribution of the content in accordance with the information for acquiring the content, and transmitting from the destination of the fifth signal A terminal device for receiving the content related to the request;
A target device that receives the first signal and transmits a third signal including a first session key included in the first signal and identification information for designating the content requested to be distributed;
The second signal and the third signal are received, the association between the first session key and the second session key included in the received signals is determined, and when the association is determined to be correct, the received A reference device that transmits the fourth signal based on identification information included in a third signal to a terminal device that is a transmission source of the received second signal;
A content distribution system comprising: a content storage device that receives the fifth signal and transmits content requested by the received fifth signal to a terminal device that is a transmission source of the fifth signal. A second signal including a second session key associated with the first session key, the first signal including a first session key configured as a unique bit string not including information identifying the terminal device; A terminal device that receives the content specified by the transmission destination of the first signal from the transmission destination of the second signal;
A target device that receives the first signal and transmits a third signal including a first session key included in the first signal and identification information for designating content to be distributed;
The second signal and the third signal are received, the association between the first session key and the second session key included in the received signals is determined, and when the association is determined to be correct, the received A fourth signal for requesting distribution of content is transmitted based on the identification information included in the third signal, the content related to the request is received from the transmission destination of the fourth signal, and the received second content is received A reference device that transmits to the terminal device that is the source of the signal;
A content distribution system comprising: a content storage device that receives the fourth signal and transmits content requested by the received fourth signal to a reference device that is a transmission source of the fourth signal. A second signal including a second session key associated with the first session key, the first signal including a first session key configured as a unique bit string not including information identifying the terminal device; A terminal device that receives the content specified by the transmission destination of the first signal from the transmission destination of the second signal;
A target device that receives the first signal and transmits a third signal including a first session key included in the first signal and identification information for designating content to be distributed;
The second signal and the third signal are received, the association between the first session key and the second session key included in the received signals is determined, and when the association is determined to be correct, the received Content distribution comprising: a reference device that extracts content from a content database based on identification information included in the third signal and transmits the extracted content to a terminal device that is a transmission source of the received second signal system. A second signal including a second session key associated with the first session key, the first signal including a first session key configured as a unique bit string not including information identifying the terminal device; , Receiving a fourth signal including information for acquiring the content, transmitting a fifth signal requesting distribution of the content in accordance with the information for acquiring the content, and transmitting from the destination of the fifth signal A terminal device for receiving the content related to the request;
To receive the first signal, specify content to be distributed in accordance with the received first signal, and acquire the first session key included in the received first signal and the content for the specified content A target device that transmits a third signal including the information of
The second signal and the third signal are received, the association between the first session key and the second session key included in the received signals is determined, and when the association is determined to be correct, the received A reference device that transmits the fourth signal based on a third signal to a terminal device that is a transmission source of the received second signal;
A content distribution system comprising: a content storage device that receives the fifth signal and transmits content requested by the received fifth signal to a terminal device that is a transmission source of the fifth signal. A second signal including a second session key associated with the first session key, the first signal including a first session key configured as a unique bit string not including information identifying the terminal device; A terminal device that receives the content specified by the transmission destination of the first signal from the transmission destination of the second signal;
Receiving the first signal, designating content to be distributed in accordance with the received first signal, and acquiring a first session key included in the received first signal and content for the designated content A target device that transmits a third signal including information;
The second signal and the third signal are received, the association between the first session key and the second session key included in the received signals is determined, and when the association is determined to be correct, the received A fourth signal requesting distribution of content is transmitted based on the third signal, the content related to the request is received from the transmission destination of the fourth signal, and the received content is transmitted from the transmission source of the received second signal. A reference device that transmits to a terminal device;
A content distribution system comprising: a content storage device that receives the fourth signal and transmits content requested by the received fourth signal to a reference device that is a transmission source of the fourth signal. A second signal including a second session key associated with the first session key, the first signal including a first session key configured as a unique bit string not including information identifying the terminal device; A terminal device that receives the content specified by the transmission destination of the first signal from the transmission destination of the second signal;
The first signal is received, the content is extracted from the content database according to the received first signal, and a third signal including the first session key included in the received first signal and the extracted content is transmitted. A target device to be
The second signal and the third signal are received, the association between the first session key and the second session key included in the received signals is determined, and when the association is determined to be correct, the received And a reference device that transmits the content included in the third signal to the terminal device that is the transmission source of the received second signal. A first signal including a first session key configured as a unique bit string not including information identifying the terminal device is received from the terminal device, and a third signal including the first session key included in the first signal is received. A target device to transmit;
A second signal including a second session key associated with the first session key is received from the terminal device, the third signal is received from the target device, and the first signal included in these received signals A reference device for determining the association between the session key and the second session key,
When it is determined that the association is correct, the content specified in accordance with the first signal is distributed to the terminal device.   7. The information according to claim 2, wherein the information for acquiring the content is any one of a URL, an address, a file name, and pointer information indicating a location where the content is stored. The content distribution system described in 1. The content distribution system according to any one of claims 1 to 9 , wherein the first session key and the second session key are the same. The content delivery system according to any one of claims 1 to 9 , wherein the second session key is hashed to be the first session key. The first session key content delivery system according to any one of claims 11 claim 1, characterized in that it is configured to include a random number. The first session key according to any one of claims 11 claim 1, characterized in that it is constituted on the basis of the string which is the concatenation of the predetermined counter value to a unique string to the terminal device Content distribution system. The content distribution system according to any one of claims 1 to 13 , wherein the target device is provided in association with an exhibit or an advertisement. The content distribution system according to any one of claims 1 to 14 , wherein the first signal is transmitted by wireless communication. The content distribution system according to any one of claims 1 to 15 , wherein the wireless communication uses infrared rays. The content distribution system according to any one of claims 1 to 16 , wherein the second signal includes address information for changing a distribution destination of the content, and the content is distributed to a terminal designated by the address information. . The content distribution system according to any one of claims 1 to 17 , wherein the first signal includes attribute information and distributes content corresponding to the attribute information. The content distribution system according to any one of claims 1 to 17 , wherein the second signal includes attribute information and distributes content corresponding to the attribute information. A target device in a content distribution system as claimed in any one of claims 19 to receive a signal including the first session key, specifies the first session key and the content contained in the signal And a signal including identification information for transmitting. Means for outputting content;
Means for switching contents to be output,
21. The target apparatus according to claim 20 , wherein the identification information is switched according to the content being output. The reference device in the content distribution system according to any one of claims 1 to 19 , wherein the signal including the first session key is received from the target device, and the signal including the second session key is received. In order to determine the correspondence between the first session key and the second session key received from the terminal device and included in these received signals, and to obtain the content distribution or the content if the correspondence is determined to be correct A reference device for transmitting the information. 23. The reference according to claim 22 , wherein identification information for specifying content is received from the target device, and content distribution or information transmission for content acquisition is performed based on the identification information. apparatus. A second signal associated with the first session key by transmitting a first signal including a first session key configured as a unique bit string not including information identifying the terminal device to the first destination; The second signal including the key is transmitted to the second transmission destination, and the received signal is received at the second transmission destination that has received the second signal and the first signal transmitted from the first transmission destination. A terminal device that receives content corresponding to the first signal that is distributed when it is determined that the association between the first session key and the second session key included is correct. The terminal device according to claim 24 , further comprising means for displaying the received content. The terminal device transmitting a first signal including a first session key configured as a unique bit string not including information identifying the terminal device to the target device;
A target device receiving the first signal and transmitting a third signal including a first session key included in the first signal to a reference device;
A target device designating content according to the first signal;
A terminal device transmitting a second signal including a second session key associated with the first session key to a reference device;
A reference device receiving the second signal and the third signal, and determining a correspondence between a first session key and a second session key included in the received signals;
And a terminal device receiving the designated content to be distributed when it is determined that the association is correct.

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