JP2008262640A - Recording / reproducing apparatus and AV data copying method - Google Patents

Abstract

Provided is a recording / reproducing apparatus capable of copying AV data for which a plurality of times or a plurality of copies are permitted, to another recording / reproducing apparatus while guaranteeing the number of permitted times or the number of permitted AV data.
A recording / reproducing apparatus according to the present invention is a recording / reproducing apparatus for recording and reproducing AV data having attribute information indicating that copying is permitted, and recording means for recording the AV data; Copy means for copying the recorded AV data and generating temporary data having attribute information indicating that copying is not permitted, and transmission for encrypting the generated temporary data and transmitting it to another device Means, and invalidating means for deleting or invalidating the transmitted temporary data.
[Selection] Figure 2

Description

  The present invention relates to a recording / reproducing apparatus that records and reproduces AV data to which copy control information is added, and in particular, guarantees the number of times or the number of licensed AV data for which a plurality of times or a plurality of copies are permitted. The present invention relates to a technique for copying to a recording / reproducing apparatus.

  2. Description of the Related Art In recent years, home networks that connect devices in the home via a network and share various contents are being realized. On the other hand, when dealing with data requiring copyright protection with copy control information added, such as a new movie or a pay TV program / music, it is necessary to provide a processing means for protecting the copyright. As an effective method for protecting the copyright, there is a method of restricting the use of the data by encrypting the data requiring the copyright protection.

  For example, when video / audio data (hereinafter referred to as “AV data”) is transmitted using a network, when it is necessary to protect the copyright of the AV data, the AV data is encrypted and transmitted. It has been broken. As such an example, a DTCP-IP (Digital Transmission Content Protection over Internet Protocol) system has been standardized.

  In the DTCP-IP system, copyright protection is realized by providing an authentication function and a key revocation function. That is, when transmitting AV data that requires copyright protection, an unauthorized device is excluded and the AV data is encrypted and transmitted. Further, in the DTCP-IP system, when AV data whose copy control information is “No more copies” (No More Copies) is recorded on another recording / reproducing apparatus, a system for moving the AV data is adopted.

  FIG. 16 is a diagram showing an execution sequence in the case of moving AV data between conventional recording / reproducing apparatuses. These recording / reproducing apparatuses are assumed to be compatible with the DTCP-IP system.

  First, an authentication process is executed between the transmission device (transmission-side recording / reproduction device) and the first reception device (reception-side recording / reproduction device). If the authentication is successful, the transmitting device distributes the exchange key to the first receiving device, and shares the exchange key between the transmitting device and the first receiving device (S901). In the mobile mode, the transmitting device distributes the exchange key only to one receiving device, and even if the second receiving device which is another receiving device requests authentication (S905), the request is rejected (S906). ). As a result, the second receiving apparatus cannot prevent the encrypted AV data from being decrypted, so that copying is prevented.

  Subsequently, when the transmission apparatus receives an AV data transmission request from the first reception apparatus (S902), the copy control information of the AV data read from the HDD (Hard Disk Drive) is “1 generation copy ready” (Copy One Generation). ). Then, the AV data is encrypted with the encryption key generated using the exchange key and transmitted to the first receiving device (S903), and the transmitted AV data is deleted (S904).

When receiving the AV data from the transmitting device, the first receiving device decrypts the AV data using the decryption key generated using the exchange key. Then, after changing the copy control information to “no more copies allowed”, the decrypted AV data is recorded.
JP 2002-245718 A (page 9) Digital Transmission Content Protection Specification Revision 1.4 (Informative Version)

  As described above, in the moving process, it is possible to prevent a plurality of receiving apparatuses from simultaneously receiving and decoding AV data. On the other hand, in copy processing other than moving, the maximum number of receiving apparatuses that can simultaneously receive AV data is limited to 34, but it is prevented that a plurality of receiving apparatuses simultaneously receive AV data. Absent.

  Here, a broadcaster or a distributor who distributes AV data may want to limit the number of copies or the number of copies (when copying is permitted up to a certain number or number of copies). However, according to the prior art, there is a problem that the number of licenses or the number of licenses cannot be guaranteed.

  In other words, the copy process does not prevent a plurality of receiving apparatuses from receiving AV data at the same time, and therefore the number of copies or the number of copies cannot be guaranteed. On the other hand, in the moving process, although it is possible to prevent a plurality of receiving apparatuses from simultaneously receiving AV data, the original AV data must be deleted after transmission. Therefore, AV data for which multiple copies or multiple copies are permitted cannot be handled under the permitted conditions.

  The present invention solves the above-mentioned problem, and can copy AV data for which a plurality of times or a plurality of copies are permitted, to another recording / reproducing apparatus while guaranteeing the number of times or the number of licenses. An object is to provide a recording / reproducing apparatus.

  In order to achieve the above object, a recording / reproducing apparatus according to the present invention is a recording / reproducing apparatus for recording and reproducing AV data having attribute information indicating that copying is permitted, and records the AV data. A recording means, a copying means for copying the recorded AV data and generating temporary data having attribute information indicating that copying is not permitted; and another apparatus for encrypting the generated temporary data. And transmitting means for transmitting to, and invalidating means for deleting or invalidating the transmitted temporary data. As a result, it is possible to prevent a plurality of receiving apparatuses from simultaneously receiving AV data even during copy processing.

  Here, the copy means generates the value of N every time the temporary data is generated for AV data having attribute information indicating that N copies (N is an integer of 1 or more) or N copies are permitted. One may be subtracted. As a result, AV data for which multiple copies or multiple copies are permitted can be copied to another recording / reproducing apparatus while guaranteeing the number of permitted times or the number of permitted copies.

  Further, the copy means may generate temporary data having attribute information meaning “no more copies are possible” defined in the DTCP (Digital Transmission Content Protection) method. Thereby, the temporary data can be transmitted in the movement mode.

  The recording / reproducing apparatus may further include display means for displaying attribute information of the AV data or the temporary data. Thereby, the attribute of AV data or temporary data can be clearly shown to the user.

  The display means may display the temporary data separately from the original AV data. As a result, it is possible to clearly indicate to the user that the temporary data is AV data temporarily created for copy processing.

  The display means may display that the temporary data is being transmitted in the “movement mode” defined in the DTCP method while the temporary data is being transmitted. This clearly indicates to the user that the temporary data is being transmitted in the movement mode.

  In addition, the copy means may virtually execute copying by assigning a plurality of AV data management information to the actual AV data. As a result, since copying is virtually executed, it is not necessary to secure an area for temporarily recording the actual AV data.

  The present invention can be realized not only as such a recording / reproducing apparatus, but also as an AV data copying method using characteristic means provided in such a recording / reproducing apparatus as a step. It can also be realized as a program executed by a computer. Needless to say, such a program can be distributed via a recording medium such as a CD-ROM or a transmission medium such as the Internet.

  As is apparent from the above description, the recording / reproducing apparatus according to the present invention can prevent a plurality of receiving apparatuses from simultaneously receiving AV data even during the copy process. Even when AV data for which a plurality of times or a plurality of copies are permitted is handled, it is possible to guarantee the number of permitted times or the number of permitted copies and copy it to another recording / reproducing apparatus.

  In addition, according to the recording / reproducing apparatus of the present invention, it is possible to clearly indicate to the user that the temporary data is AV data created temporarily for the copy process. Furthermore, while transmitting the temporary data, it is possible to clearly indicate to the user that the transmission is performed in the “movement mode” defined in the DTCP method.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

(Embodiment)
<Overall configuration>
FIG. 1 is a diagram showing a use environment of the recording / reproducing apparatus in the present embodiment.

  As shown in this figure, the recording / reproducing apparatuses 1 to 3 are connected to the broadband router 4 to constitute a home network. The broadband router 4 may be connected to the Internet 5. The recording / reproducing apparatus 1 is a set-top box or the like that has a built-in digital tuner and can receive a digital broadcast and record it in a built-in HDD. The recording / reproducing apparatus 1 transmits the AV content recorded in the built-in HDD to the recording / reproducing apparatus 2 and the recording / reproducing apparatus 3. The recording / reproducing apparatuses 2 and 3 are DVD / HDD hybrid recorders that receive AV contents from the recording / reproducing apparatus 1. Hereinafter, the recording / reproducing apparatus 1 may be referred to as “transmitting apparatus”, the recording / reproducing apparatus 2 may be referred to as “first receiving apparatus”, and the recording / reproducing apparatus 3 may be referred to as “second receiving apparatus”. Further, the first receiving device and the second receiving device may be referred to as “receiving device” without particularly distinguishing them.

  In the initial state, it is assumed that the AV content 1 that is “N times copyable” content is recorded by the recording / playback device 1 and that the AV content is transmitted to the recording / playback device 2. N is an integer of 1 or more. The method for generating AV content recorded in the recording / reproducing apparatus 1 is not particularly limited. For example, it can be received from the outside through a network, or can be generated in the recording / reproducing apparatus 1. There are various types of AV content such as moving images, still images, and music. As for the network, various forms such as the Internet and a home network can be considered. Regarding the form in which the recording / reproducing apparatuses 1 to 3 are connected to the network, various forms such as wired and wireless are possible.

  FIG. 2 is a diagram showing an outline of a process of copying AV content between the recording / playback apparatuses according to the present embodiment. As already described, a broadcaster or distributor who distributes AV data may want to limit the number of copies or the number of copies. However, according to the prior art, the number of licenses or the number of licenses cannot be guaranteed. Therefore, the following method is adopted in the present invention.

  In other words, when it is desired to copy the AV content 1 that is “N times copyable” content only to the recording / reproducing apparatus 2, the recording / reproducing apparatus 1 copies the AV content 1 and is in an “uncopyable” state. The content 1a is generated, and the generated AV content 1a is encrypted in the movement mode and transmitted to the recording / reproducing apparatus 2. In the transfer mode, the exchange key for decrypting the encrypted data can be acquired only by the recording / playback apparatus 2 that is the transfer destination. In other words, the recording / reproducing apparatus 3 that is not the destination cannot decrypt the encrypted data even if it is received. In this way, it is possible to prevent a plurality of receiving apparatuses from simultaneously receiving AV data even during copy processing.

  Hereinafter, the configuration of the present invention will be described in more detail with reference to the drawings.

<Configuration of transmitter>
FIG. 3 is a diagram showing a configuration of the recording / reproducing apparatus in the present embodiment.

  As shown in this figure, the recording / reproducing apparatus 1 includes a transmission / reception unit 21, an encryption processing unit 22, a key exchange processing unit 23, an authentication processing unit 24, a transmission control unit 25, an HDD (Hard Disk Drive) 26, a copy processing unit. 27, a deletion processing unit 28, and an attribute information display processing unit 29.

  The transmission / reception unit 21 is an example of a transmission unit according to the present invention. That is, the transmission / reception unit 21 is a digital interface for transmitting AV content (hereinafter also referred to as “AV data”) to the network and transmitting / receiving commands to / from other devices connected to the network.

  The encryption processing unit 22 encrypts the AV data read from the HDD 26. The encryption key (Kc) is generated using the exchange key (Kx) received from the key exchange processing unit 23, the copy control information (E-EMI) received from the transmission control unit 25, and the key update counter value (Nc). The The encrypted AV data is divided into AV data packets and transmitted via the transmission / reception unit 21.

FIG. 4 is a diagram showing a format of the AV data packet in the present embodiment.
As shown in this figure, the AV data packet is composed of a header part and a data part. The header part includes copy control information (E-EMI), a key update counter value (Nc), and a byte length (Length) of the data part. The copy control information is information relating to copy control of AV data, and is specifically an identification indicating one of “copy prohibited”, “copy prohibited further”, “1 generation copy allowed”, “copy free”, and “moving”. Code. “Moving” is set when moving AV data of “No more copies”. The key update counter value (Nc) is a counter value used when generating an encryption key and a decryption key. The key update counter value (Nc) is incremented by +1 for each AV data transmission request from the receiving device by the transmission control unit 25 of the transmitting device, and +1 whenever the transmission of AV data in response to the AV data transmission request exceeds 128 MB. Count up. In this case, every time the AV data exceeds 128 MB, the transmission device divides the AV data into new AV data packets and transmits the AV data.

  The key exchange processing unit 23 generates an exchange key (Kx) used by the receiving device for decrypting the encryption of AV data. Then, the generated exchange key (Kx) is encrypted using the authentication information (Kauth) received from the authentication processing unit 24. The encrypted exchange key (Kx) is output via the transmission / reception unit 21.

  The authentication processing unit 24 receives an authentication start request command from the receiving device, performs authentication processing, and shares authentication information (Kauth) with the receiving device. In the mobile mode, if the exchange key has already been distributed to one receiving device, the authentication start request command is rejected. In the copy mode, if the exchange key has already been distributed to 34 receiving apparatuses, the authentication start request command is rejected.

  The transmission control unit 25 is a control processing unit that controls each unit of the transmission device and executes AV data transmission processing. When transmitting AV data that is in the “copy prohibited” state, the transmission control unit 25 sets the AV data copy control information (E-EMI) to “moving” and encrypts and transmits the AV data. . Then, after the transmission of the AV data is completed, a request to delete the transmitted AV data is output to the deletion processing unit 28 to execute the deletion process. On the other hand, when transmitting AV data that is in the “N times copy possible” state, a copy request is output to the copy processing unit 27 to generate a copy of the AV data. Then, the state of the original AV data is set to the “N−1 times copy possible” state, the copy control information of the copied AV data is set to “moving”, and encrypted transmission is performed. Further, after the transmission of the AV data is completed, a request to delete the AV data of the transmitted copy is output to the deletion processing unit 28 to execute the deletion process.

  The HDD 26 is an example of a recording unit according to the present invention. The HDD 26 records AV data received by a built-in digital tuner (not shown), AV data generated by the copy processing unit 27, and an attribute information management table T1 for managing attribute information of the AV data. Has been. The HDD 26 outputs the reproduced AV data to the encryption processing unit 22. Deletion of AV data recorded in the HDD 26 is executed by the deletion processing unit 28.

  The copy processing unit 27 is an example of a copy unit according to the present invention. That is, in response to a request from the transmission control unit 25, the copy processing unit 27 generates a copy in a “no more copy” state from the copyable AV data recorded in the HDD 26, and the AV data of the generated copy Attribute information related to (temporary data) is added to the attribute information management table T1.

  When the generated temporary data is used only for transmission in the movement mode and is not used for reproduction or the like, it is not necessary to record the temporary data in the HDD 26. Therefore, in this case, the copy process may be executed virtually by assigning a plurality of AV data management information to the actual AV data. That is, when a request from the transmission control unit 25 is received, attribute information is added to the attribute information management table T1, and temporary data is generated on a RAM (Random Access Memory). Then, the generated temporary data is transmitted in the movement mode, while the transmitted temporary data is deleted from the RAM. In this way, there is no need to record temporary data on the HDD 26.

  The deletion processing unit 28 is an example of an invalidating unit according to the present invention. That is, in response to a request from the transmission control unit 25, the deletion processing unit 28 deletes the AV data recorded in the HDD 26 and updates the attribute information management table T1.

  The attribute information display processing unit 29 is an example of a display unit according to the present invention. That is, the attribute information display processing unit 29 creates display data for user display based on the content of the attribute information management table T1 recorded in the HDD 26 and displays it.

<Configuration of receiving device>
FIG. 5 is a diagram illustrating a configuration of the first receiving apparatus according to the present embodiment.

  As shown in this figure, the first receiving device includes AV data receiving means, a transmitting / receiving unit 31, a decryption processing unit 32, a key exchange processing unit 33, an authentication processing unit 34, a transmission control unit 35, and an HDD 36. The Here, the first receiving apparatus is illustrated, but the configuration of the second receiving apparatus is also the same.

  The transmission / reception unit 31 is a digital interface for receiving AV data via a network and transmitting / receiving commands and the like to / from other devices connected to the network.

  The decryption processing unit 32 decrypts the encryption of the AV data received from the transmission device. The decryption key (Kc) is generated using the exchange key (Kx) received from the key exchange processing unit 33, the copy control information (E-EMI) in the header portion of the AV data packet, and the key update counter value (Nc). The AV data decrypted by the decryption processing unit 32 into plain text is recorded in the HDD 36.

  The key exchange processing unit 33 uses the authentication information (Kauth) received from the authentication processing unit 34 to decrypt the received exchange key and transmits it to the decryption processing unit 32.

  The authentication processing unit 34 transmits an authentication start request command to the authentication processing unit 24 of the recording / reproducing apparatus 1, executes authentication processing, and shares authentication information (Kauth).

  The transmission control unit 35 is a control processing unit that controls each unit of the receiving device and executes AV data transmission processing. When the copy control information of the received AV data is “moving”, the transmission control unit 35 records the received and decoded AV data in the HDD 36 as it is. On the other hand, when the copy control information of the received AV data is “1 generation copy is possible”, the received and decoded AV data is changed to the “copy is impossible” state and recorded in the HDD 36.

  In the HDD 36, AV data output from the decoding processing unit 32 and an AV data management table T2 for managing the AV data are recorded.

  Next, operations of the transmission device and the reception device in the present embodiment will be described.

<Operation of transmitter>
FIG. 6 is a flowchart showing the operation of the transmission apparatus according to this embodiment. Here, a process in the case where AV content is copied or moved from the transmission apparatus (recording / reproducing apparatus 1) to the receiving apparatus (recording / reproducing apparatus 2) will be described.

  The authentication processing unit 24 of the transmitting device receives the authentication start request command from the receiving device (S101), and executes the authentication processing (S102). If the authentication of the receiving device fails (NO in S103), the transmission control unit 25 ends the process. On the other hand, when the authentication of the receiving apparatus is successful (YES in S103), it is confirmed whether or not copying is possible by referring to the copy control information of the AV data to be transmitted (S104). If copying is possible (YES in S104), the copy processing unit 27 copies the original AV data to generate temporary data (S105), and then executes the AV data transmission process (S106). On the other hand, if copying is not possible (NO in S104), the AV data transmission process is immediately executed (S106). After completing the AV data transmission process, the transmission control unit 25 deletes the AV data transmitted to the deletion processing unit 28 and updates the attribute information management table T1 (S107).

  In the case of the exchange key in the normal mode, a new exchange key is not generated. Subsequently, key exchange processing S106 is executed to update the receiving device management table T3.

FIG. 7 is a diagram showing the configuration of the reception device management table in the present embodiment.
The receiving device management table T3 is an information table managed by the transmitting device (recording / reproducing device 1), and is an information table that records information for managing 34 receiving devices. The receiving device management table T3 records the IP address and device ID of the receiving device when the authentication / key exchange process is performed. The receiving device management table T3 shown in FIG. 7 indicates that information for three receiving devices is registered, and information for the remaining 31 devices is in an unregistered state. The information registered in the receiving device management table T3 is initialized when the exchange key is discarded under a predetermined condition.

<Operation of receiving apparatus>
FIG. 8 is a flowchart showing the operation of the receiving apparatus according to this embodiment. Here, processing from authentication / key exchange processing during encrypted transmission to encrypted transmission will be described.

  The authentication processing unit 34 of the receiving device transmits an authentication start request command to the transmitting device, starts authentication / key exchange processing (S201), and acquires an exchange key from the transmitting device. Next, the transmission control unit 35 of the receiving device transmits an AV data transmission request for requesting transmission of AV data in the movement mode or the normal mode to the transmitting device (S203), and receives the AV data from the transmitting device. The AV data is decrypted and recorded in the HDD 36 (S204).

  The transmission control unit 35 of the receiving device checks copy control information (E-EMI) stored in the header portion of the received AV data packet. If the copy control information is “moving”, the AV data is recorded in the HDD 36 as it is. On the other hand, if the copy control information is “1 generation copy is possible”, the copy control information is changed to a state where “copying is no longer possible” and AV data is recorded in the HDD 36. Finally, it is determined whether the reception process should be terminated (S205). If the reception process should be continued, an AV data transmission request is transmitted again to the transmission device (S202), and the reception process is repeated.

<Overall operation sequence>
The overall operation sequence in the AV data copy process will be described below.

  FIG. 9 is a diagram showing a communication sequence when AV data is copied from the transmission device to the reception device in the present embodiment.

  First, the receiving device transmits an authentication start request command to the transmitting device (S250), executes authentication / key exchange (S251), and then transmits an AV data transmission request to the transmitting device (S252). The transmitting device copies the requested AV data to generate temporary data (S253), and transmits the generated temporary data to the first receiving device in the movement mode (S253). At this time, “moving” indicating the movement mode is set in E-EMI. The receiving device records the received AV data in the HDD 36. When the transmission is completed, the transmission device deletes the transmitted temporary data (S255).

FIG. 10 is a diagram showing the configuration of the attribute information management table in the present embodiment.
The attribute information management table T1 is an information table managed by the transmission apparatus (recording / reproducing apparatus 1), and is an information table for recording attribute information of AV data recorded in the HDD 26. As shown in this figure, in the attribute information management table T1, each item of “program name”, “recording start time”, “recording time”, “copy control information”, and “playback / recording state” is set as attribute information for each AV data. I manage. The attribute information of each AV data is newly generated and added to the table T1 when recording or copying is executed, and is deleted from the table T1 when deletion processing is executed.

  As the playback / recording state, any one of “recording”, “playback”, “move”, “copy”, “delete”, and “stop” is set. The AV data generated by the copy processing unit 27 is set with a program name indicating that it is a temporary copy in order to distinguish it from the original AV data recorded by the normal recording process. As copy control information, “copy not possible” or “copy possible (number of times of copying)” is set. “No copy” means “no more copies” defined in the DTCP system. The number of copies that can be made in “Copy available (number of copies allowed)” is decremented by one every time the copy generation process is executed.

FIG. 11 is a diagram showing a list of recorded programs in the present embodiment.
The attribute information display processing unit 29 generates display data based on the attribute information recorded in the attribute information management table T1. The generated display data is output as a recorded program list to a display device 6 such as a liquid crystal television connected to the recording / reproducing device 1 as shown in FIG. Of course, the contents of the recorded program list are not limited to the contents shown in this figure.

FIG. 12 is a diagram showing another recorded program list in the present embodiment.
As shown in this figure, the copy control information may be represented by a mark indicating its meaning. For example, since the copy control information of the AV data corresponding to the management number “1” is “copy not possible”, “x” may be added before the program name. On the other hand, since the copy control information of the AV data corresponding to the management number “2” is “Copy permitted (N times)”, “◯” may be added before the program name. Thus, when the copy control information is represented by a mark, there is an advantage that it is possible to immediately grasp whether or not the AV data can be copied.

  FIGS. 13-15 is a figure for demonstrating the transition of the video recording program list in this Embodiment.

  In the attribute information table T1 of FIG. 10, the AV data corresponding to the management number “3” includes the characters “temporary copy” in the program name. Therefore, it can be seen that the AV data corresponding to the management number “3” is not the original AV data but temporary data. When the copying is completed, the playback / recording state of the AV data corresponding to the management number “3” is updated from the “copy” state to the “move” state as shown by the arrow portion in FIG. Therefore, it can be seen that the AV data corresponding to the management number “3” is being transmitted in the “movement mode” defined in the DTCP system. When the transmission is completed, the playback / recording state of the AV data corresponding to the management number “3” is updated from the “move” state to the “delete” state as shown by the arrow in FIG. As indicated by the arrow, the “deleted” state is updated to the “stopped” state. Here, the point that the contents of the recorded program list displayed on the display device 6 are transitioned has been described, but it goes without saying that the contents of the attribute information management table T1 similarly transition.

  As described above, according to the recording / reproducing apparatus of the present embodiment, even when it is desired to copy AV data for which multiple copies or a plurality of copies are permitted to other recording / reproducing apparatuses, a plurality of receiving apparatuses can simultaneously receive AV data. Can be prevented from being received. Further, since it is not necessary to delete the original AV data after transmission, it is possible to execute the permitted copy processing while guaranteeing the number of copies or the number of copies.

  In addition, the recording / reproducing apparatus of the present embodiment displays the temporary data generated by the copy processing unit 27 separately from the original AV data. As a result, it is possible to clearly indicate to the user that the temporary data is AV data temporarily created for copy processing.

  In addition, the recording / reproducing apparatus of the present embodiment displays that the transmission is performed in the “movement mode” defined in the DTCP method while the temporary data generated by the copy processing unit 27 is being transmitted. This clearly indicates to the user that the temporary data is being transmitted in the movement mode.

  Note that when the AV data is transmitted in the movement mode, the recording / reproducing apparatus in the present embodiment deletes the entire AV data after the transmission of the entire AV data is completed, but transmits a part of the AV data. Sometimes that part may be deleted sequentially. Further, invalidation processing such as destruction of the local encryption key may be performed instead of performing the deletion processing.

  Further, when the AV data is transmitted in the movement mode, the recording / reproducing apparatus according to the present embodiment deletes the AV data without confirming that the AV data is recorded in the receiving apparatus. AV data may be deleted after confirming that the data has been recorded.

  Further, although the recording / reproducing apparatus in the present embodiment detects that AV data is transmitted in the movement mode based on the copy control information added to the AV data, the movement mode detecting means is not limited to this. . For example, it may be detected that the AV data is transmitted in the movement mode by determining the content of the transmission mode notification from the transmission device.

  Further, although the recording / reproducing apparatus in the present embodiment moves the AV data of “No more copies”, the AV data of “Copy Never” may be moved. That is, even when the copy control information is AV data in other copy-impossible states, the same effect as in the case of AV data with “no more copies allowed” can be obtained.

  In this embodiment, the recording / reproducing apparatus is distinguished from the transmitting apparatus and the receiving apparatus. However, it is apparent that the recording / reproducing apparatus may have both functions of a transmitting function and a receiving function. In that case, the HDD 26 may be shared by the transmission function and the reception function, or the HDD 26 may be provided for each of the transmission function and the reception function.

  The recording / reproducing apparatus in the present embodiment starts transmission / reception of AV data by receiving an AV data transmission request from the receiving apparatus. However, the recording / reproducing apparatus uses an AV data reception request such as a POST request in HTTP. May be transmitted to the receiving device to start transmission / reception of AV data.

  In this embodiment, the HDD is exemplified as the recording unit, but the recording unit in the present invention is not limited to the HDD. For example, other recording means such as an optical disk drive or a semiconductor memory may be employed, or a plurality of types of recording means may be used in combination.

  The present invention relates to a set-top box, a DVD / HDD hybrid recorder, or the like that needs to copy AV data for which copying is permitted a plurality of times or a plurality of copies to another recording / reproducing apparatus while guaranteeing the number of times or the number of permitted AV data. Can be applied to.

The figure which shows the use environment of the recording / reproducing apparatus in this Embodiment The figure which shows the outline | summary of the process which copies AV content between the recording / reproducing apparatuses in this Embodiment The figure which shows the structure of the recording / reproducing apparatus in this Embodiment The figure which shows the format of AV data packet in this Embodiment The figure which shows the structure of the 1st receiver in this Embodiment. Flowchart showing operation of transmitting apparatus in the present embodiment The figure which shows the structure of the receiver management table in this Embodiment. Flowchart showing operation of receiving apparatus in this embodiment The figure which shows the communication sequence in the case of copying AV data from the transmitter in this Embodiment to a receiver The figure which shows the structure of the attribute information management table in this Embodiment. The figure which shows the recorded program list in this Embodiment The figure which shows another recorded program list in this Embodiment The figure for demonstrating the transition of the recorded program list in this Embodiment The figure for demonstrating the transition of the recorded program list in this Embodiment The figure for demonstrating the transition of the recorded program list in this Embodiment The figure which shows the execution sequence in the case of moving AV data between the conventional recording / reproducing apparatuses

Explanation of symbols

1, 2, 3 Recording / reproducing apparatus 21 Transmission / reception unit 22 Encryption processing unit 23 Key exchange processing unit 24 Authentication processing unit 25 Transmission control unit 26 HDD
27 Copy Processing Unit 28 Deletion Processing Unit 29 Attribute Information Display Processing Unit 31 Transmission / Reception Unit 32 Decryption Processing Unit 33 Key Exchange Processing Unit 34 Authentication Processing Unit 35 Transmission Control Unit 36 HDD
S105 Copy generation processing

Claims (9)

A recording / reproducing apparatus for recording and reproducing AV data having attribute information indicating that copying is permitted,
Recording means for recording the AV data;
Copying means for copying the recorded AV data and generating temporary data having attribute information indicating that copying is not permitted;
Transmitting means for encrypting the generated temporary data and transmitting it to another device;
A recording / reproducing apparatus comprising: invalidating means for deleting or invalidating the transmitted temporary data. The copying means increments the value of N by one each time the temporary data is generated for AV data having attribute information indicating that N copies (N is an integer of 1 or more) or N copies are permitted. The recording / reproducing apparatus according to claim 1, wherein subtraction is performed. The recording / reproducing apparatus according to claim 1, wherein the copying unit generates temporary data having attribute information meaning “no more copies” defined in a DTCP (Digital Transmission Content Protection) method. The recording / reproducing apparatus further includes:
The recording / reproducing apparatus according to claim 1, further comprising display means for displaying attribute information of the AV data or the temporary data. The recording / reproducing apparatus according to claim 4, wherein the display means displays the temporary data separately from the original AV data. 5. The recording / reproducing apparatus according to claim 4, wherein the display unit displays that the temporary data is being transmitted in a “movement mode” defined in the DTCP method while the temporary data is being transmitted. The recording / reproducing apparatus according to claim 1, wherein the copying unit virtually executes copying by assigning a plurality of AV data management information to the actual AV data. An AV data copy method in which a recording / reproducing apparatus for recording and reproducing AV data having attribute information indicating that copying is permitted copies the AV data to another apparatus,
A recording step for recording the AV data;
A copy step of copying the recorded AV data and generating temporary data having attribute information indicating that copying is not permitted;
A transmission step of encrypting the generated temporary data and transmitting it to the other device;
And an invalidation step of deleting or invalidating the transmitted temporary data. A recording / reproducing apparatus for recording and reproducing AV data having attribute information indicating that copying is permitted is a program for copying the AV data to another apparatus,
A recording step for recording the AV data;
A copy step of copying the recorded AV data and generating temporary data having attribute information indicating that copying is not permitted;
A transmission step of encrypting the generated temporary data and transmitting it to the other device;
A program for causing a computer to execute an invalidation step of deleting or invalidating the transmitted temporary data.

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