JP2002237788A - Digital broadcast receiver - Google Patents

Abstract

(57) [Summary] PROBLEM TO BE SOLVED: To provide a disadvantage to a user in some cases due to a function provided in a receiver for the purpose of copyright protection. A copyright protection function of a receiver, an I / F information management unit for recognizing the same function of a connected device, an information analysis unit for analyzing information related to copyright protection from received information, and restrictions on contents. It has a program duplication management processing unit to add, and changes the content restriction method according to each information.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus for displaying a program transmitted through a broadcast or the like, and more particularly to a system and an apparatus for processing and applying information for the purpose of copyright protection.

[0002]

2. Description of the Related Art Digital broadcasting is expected to rapidly rise with the use of a service using a communication satellite (CS) and spread steadily to broadcasting satellites (BS) and terrestrial waves in the future. In digital broadcasting, since high-quality video can be received and reproduced and recorded, interest in copyright protection is increasing. In particular, a management method for storing high-quality video and audio in a recording device is an issue. JP-A-11-14637
Japanese Patent Publication No. 8 proposes a technique for solving this problem. The outline of the known example will be described with reference to FIG.

In FIG. 2, reference numeral 201 denotes a viewable condition adding means for adding a viewable condition to data to be transmitted;
Is an uplink equipment, 203 is a satellite repeater, 204 is a receiving antenna, 205 is a digital broadcast receiver, 206, 2
07 and 208 are components of the digital broadcasting receiver.
06 is a data storage means, 207 is a deterioration processing means for performing data deterioration processing, and 208 is a viewing condition judgment means.
Further, the receiving side has a means 209 for viewing the received data as a component thereof.

[0004] Data such as video and audio to which viewing conditions have been added are stored in the uplink equipment 202 and the satellite 203.
, And received by the digital broadcast receiver 205. The digital broadcast receiver 205 includes the viewing means 2
In addition to the output to the data storage unit 09, the data is directly recorded in the data recording unit 206, and then the image quality or sound quality is degraded by the degradation processing unit 207 and output to an external storage device. Further, depending on conditions, it is also possible to store the data in the storage unit after passing through the deterioration processing unit 207. The viewable condition determining unit 208 determines the viewing condition in the data storage unit 206 and controls whether to output the data subjected to the degradation processing to the viewing unit 209 or to output the data without the degradation processing.

In this known example, the problem is solved by lowering the quality of an image or sound to a level at which copyright can be protected by the deterioration processing means 207.

[0006]

In the above-mentioned known example, means for deteriorating the quality of the content is employed in order to protect the copyright, and the problem is solved in that illegal copying is rendered meaningless. ing. However, a legitimate user has a demand to save the content in a recording device without deteriorating the value of the content, and this cannot be said to be a method satisfying both the content holder and the user in this regard.

[0007] It is an object of the present invention to provide a system and an apparatus for preventing the illegal copying and enabling high-quality content to be stored for a legitimate user, which guarantees the benefits of both the content holder and the user. And

[0008]

According to the present invention, in order to solve the above-mentioned problems, information acquisition processing means for extracting necessary information packets from a received digital broadcast stream, and contents for decoding video and audio are provided. Decryption means;
A program duplication management processing means for processing contents based on information relating to program duplication, an information analyzing unit for analyzing at least the contents of various information packets, and an I for managing the level of the copyright protection function of the connected device through an external interface
/ F information control unit, a decrypted content output unit, and a stream input / output unit, and copyright protection of a device connected by the I / F information analysis unit in the control unit. After confirming the function level, the information analysis section in the control means analyzes information related to copyright protection contained in the input stream, changes the processing content in the program copy management processing means, and connects Depending on the level of the copyright protection function of the device, it is possible to obtain an output that ensures broadcast quality.

[0009]

FIG. 1 shows an embodiment of the present invention.
In FIG. 1, reference numeral 101 denotes an input terminal of a digital broadcast signal,
Reference numeral 102 denotes a reception processing unit that receives a broadcast signal and obtains a digital stream, 103 denotes an information acquisition processing unit that extracts various information from the received digital stream, and 104 decodes a video or audio signal obtained from the information acquisition processing unit 104. 105, a program duplication management processing unit for performing specific processing on the decrypted content; 106, an output unit A for outputting analog baseband content; 107, a digital baseband content output Output units B and 108 are input / output units of the digital stream converted into the packet configuration required by the information acquisition processing unit, and 109, 110 and 111 are the output units A 106 and
The output unit B107, the output or input / output terminal of the input / output unit 108, 112 is a control unit for controlling the entire apparatus of the present embodiment, 113 to 117 are components included in the control unit 112, and 113 is a CPU. , 114 are processing work memories, 115 is a program storage memory, 11
Reference numeral 6 denotes an information analysis unit for analyzing information transferred from the information acquisition processing unit 103. Reference numeral 117 denotes a function determination of the output unit A106, the output unit B107, and the input / output unit 108, and a determination of a function of a connected device. An I / F information management unit that performs the following.

In this embodiment, three interfaces are assumed as outputs of the apparatus. The output unit A106 is a normal analog output, and has a function of protecting a content, such as a signal insertion function for inhibiting reproduction of an analog VTR. The output unit B107 is a digital output, and has a function of interlocking with a connected display device or the like to encrypt contents and prevent illegal duplication. On the other hand, the input / output unit 108 assumes, for example, an IEEE 1394 interface,
This is an interface that is interfaced in the form of a digital stream before content decryption, and performs a content protection function by authentication between devices. The digital broadcast signal received by the reception processing unit 102 is subjected to processes such as channel selection and demodulation, and is converted into a packetized bit stream format called a transport stream. The information acquisition processing unit 103 selects necessary information from the transport stream and transfers the information to the content decoding unit 104 and the control unit 112.
The content decoding unit 104 decodes digitally compressed video and audio.

The control unit 112 extracts and analyzes information packets related to a program from the transport stream selected by the information acquisition processing unit 103, and controls each block. Here, information on the copyright protection of the program is also analyzed, and the
5 is determined. For copyright protection information,
For example, information such as copy prohibition, copy permitted, and copy once permitted. Further, depending on the broadcasting system, it may be conceivable that copying is determined in advance depending on the quality of the content. On the other hand, the I / F information analysis unit recognizes the specifications of the I / F of the output unit A 106, the output unit B 107, and the input / output unit 108. For example, when the output unit A106 is an output terminal for an analog baseband signal for connecting to a normal TV, the copyright protection function level of this I / F is a type that degrades synchronization performance. judge. If the output unit B107 is an I / F that performs authentication with the display device side and transmits an encrypted digital baseband signal, the I / F in which the copyright protection function is established is provided.
F is recognized. If the input / output unit 108 is, for example, a terminal conforming to the IEEE1394 specification, it can be determined that the copyright protection function has been established.

When the information about the copyright of the received program or the content inputted from the input / output terminal 108 is copy-prohibited, the control unit 112 sends the information from the output unit A 106 having a low copyright protection function level. Stop video output. Alternatively, depending on the conditions of the system, the program duplication management processing unit 105 performs a filtering process or the like for lowering the resolution of the content to make the quality conform to the duplication conditions, and then outputs from the output terminal 109. Also, when the output unit B107 is connected to a display device, the content protection function can be confirmed by authentication with the display device, etc., so that the content protection function of the connected device can be recognized as valid. After performing the encryption process and the like in the output unit B107, the data is output to the display device. Further, when it is determined that the copyright protection function is insufficient, even if the connected device is merely a presentation device, the program copy management processing unit 105 outputs after limiting the resolution. Similarly, since the input / output unit 108 is an interface for which the content protection function is guaranteed, it is possible to output high-quality content after checking the function of the connected device.

In this embodiment, the information analysis unit 116 for analyzing the protection information of the content, and the I / F for detecting and managing the content protection function of each interface of the apparatus.
Even when the duplication of the content is prohibited by the information management unit 117 or the like, it is possible to display and display the transmitted content while keeping the quality of the content.

FIG. 3 shows some of the components of the program duplication management processing unit 105. 3, reference numeral 301 denotes an input terminal of a video signal from the content decoding unit 104, 302 denotes an output terminal to each of the output units 106 and 107, 303 denotes a vertical filter, 304 denotes a horizontal filter, and 305 denotes the control unit 1.
12 is an input terminal for a control signal from In FIG.
The vertical filter 303 and the horizontal filter 304
Basically reduces the vertical and horizontal resolutions of a video. The resolution of a video signal output for the purpose of copyright protection is analyzed by the information analyzer 115 and the I / F information manager 117. Used to limit the The resolution limit is set to a predetermined value as a system-specific value, but it can also be determined for each program or the like based on transmission information. Also, only vertical resolution,
Alternatively, only the horizontal resolution may be limited. In the present embodiment, the output terminal of the video whose resolution has been reduced is described as one. However, it has a plurality of output units like the components in FIG. There may be a case where there is no resolution restriction and the other has a resolution restriction. In this case, having two filters of FIG.
By providing a pass for the through processing, it becomes possible to cope with this.

FIG. 4 shows the output section A10 in this embodiment.
6, a specific configuration of the output unit B107 will be described. FIG.
, 401 is a receiving apparatus described in the present embodiment, 402 is a program copy management processing unit, 403 is a system control unit, and 404 is
Is an output unit, 405 is an encryption unit, 405 is an authentication processing unit, 4
07 is an output terminal for video / audio data, etc., 408 is an input / output terminal for information for performing authentication, 409 is a recording device for video / audio, etc., 410 is an input terminal for video / audio data, etc., 411 is data for authentication processing Input / output terminals of 412
Is a decoding unit, 413 is an information compression unit for video and audio, 41
Reference numeral 4 denotes a recording unit; and 415, an authentication processing unit. The receiving device 401 and the recording device 409 in FIG. 4 mainly show only functional blocks related to the present embodiment, and other components as a receiver or a recording device are omitted. When the receiving device 401 is connected to another device, the system control unit 403 performs an authentication operation to check the validity of the device connected through the authentication processing unit 406 and the device. If it is confirmed that the device is valid, the authentication processing units 406 and 415 exchange a key for encryption. The receiving device 401 encrypts the data based on the transmitted program information or the like and, if necessary, outputs the data after encrypting the data with the encrypting unit 405. The recording device 409 decrypts the received data such as video and audio based on the exchanged key,
After performing information compression for recording, the recording unit 414
To record. In FIG. 4, the reproduction mechanism of the recording device 409 is not described because it is not particularly related to the present invention. In this way, if it can be confirmed that unauthorized duplication etc. is not executed by the device connected by the authentication work,
The program duplication management processing unit 402 can record and reproduce high-quality and high-quality contents without performing signal processing that is disadvantageous to the viewer such as lowering the resolution of the video.

FIG. 5 shows another device connected to the receiving device 401 shown in FIG. 4, wherein 501 is a display device, 502 is a data input section for video and audio, and 503 is authentication data data. An input / output terminal 504 is a decoding unit for data such as encrypted video and audio, 505 is a display unit such as a display, and 506 is an authentication processing unit. Display device 5
01 is a device having only a display unit with respect to the receiving device 401 by the authentication work, and is confirmed to be a device that does not illegally transfer data to another device.
A key can be obtained, and high-quality and high-quality content can be received and displayed.

The data paths for authentication shown in FIGS. 4 and 5 include, for example, a method using the same bus according to the IEEE 1394 standard, and are not particularly specified to different terminals.

Although the authentication and encryption with the connection device described in the present embodiment are not particularly novel,
After confirming the legitimacy of the connected device by the authentication unit, etc., by performing processing control on video and audio information to be output in combination with the copy management information of the transmitted program, the owner of the valid device can obtain high image quality, The effect of supplying high-quality content can be expected.

FIG. 6 shows another embodiment of the present invention. 6, reference numeral 601 denotes a presentation unit for video and audio, and the other components are the same as those in the embodiment of FIG. In the present embodiment, the presentation unit 601 includes a display, a speaker, and the like, and is different from the embodiment of FIG. The control unit 112 outputs to the presentation unit 601 without processing by the program copy management processing unit 105 regardless of the copy information to be transmitted. That is, even if it is necessary to lower the resolution of a high-quality image for recording, the image is output to the presentation unit 601 without lowering the resolution. On the other hand, for the output unit B107 and the like, FIG.
In the same manner as in the embodiment of the present invention, based on the information about the copy of the transmitted program, the copyright protection management level of the output unit B107, and the information of the device connected to the output terminal 110, the output information data is The output is performed after predetermined processing is performed by the program duplication management processing unit 105.

According to this embodiment, at least a program can be presented with high quality regardless of the level of the copy information.

Although not shown, when a recording device is incorporated in the receiving device, the control unit 112 also manages the time recorded in the recording device. In the duplication management processing unit 105, it is necessary to perform predetermined processing also on the built-in presentation unit 601 to present a video or audio with reduced quality.

[0022]

According to the present invention, illegal copying is prevented,
In addition, it is possible to provide a system and an apparatus that enable a regular user to store high-quality content and guarantee the benefits of both the content holder and the user.

[Brief description of the drawings]

FIG. 1 is a block diagram showing one embodiment of the present invention.

FIG. 2 is a block diagram showing a conventional example of the present invention.

FIG. 3 is a block diagram showing a partial configuration of a program copy management processing unit according to the present invention.

FIG. 4 is a block diagram showing a specific example of an output unit and a connection device according to the present invention.

FIG. 5 is a block diagram showing a specific example of the connection device of the present invention.

FIG. 6 is a block diagram showing one embodiment of the present invention.

[Explanation of symbols]

101 input terminal, 102 reception processing unit, 103 information acquisition processing unit, 104 content decryption unit, 105 program replication management processing unit, 106 information output unit, 107 information output unit, 108 information input / output unit , 112 ... control unit, 113
... CPU, 114, memory, 116, information analysis unit, 11
7 ... I / F information management unit.

──────────────────────────────────────────────────の Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat ゛ (Reference) H04N 7/08 H04N 7/08 Z 7/081 (72) Inventor Hiroyuki Koreeda Yoshida-cho, Totsuka-ku, Yokohama-shi, Kanagawa 292 F-term (Reference) in Digital Media Development Division, Hitachi, Ltd. HL08 HL11

Claims (7)

[Claims] 1. A receiving device for receiving a signal including video and audio information and program duplication information relating to duplication of a program, and outputting the signal to an external device, comprising: an obtaining unit for obtaining program duplication information from the received signal; And information output means or information input / output means or both for outputting video and audio information to the outside, and analysis of the program copy information and analysis of the information output means or the information input / output means or both regarding copy management. A digital broadcast receiving apparatus, comprising: an information analyzing means for performing; and a program copy management processing means for performing a different copy management restriction process depending on a result analyzed by the information analyzing means. 2. The digital broadcast receiving apparatus according to claim 1, wherein said program duplication management processing means includes a filter means for limiting a resolution of a video. 3. The digital broadcast receiving apparatus according to claim 2, wherein said filter means limits only a vertical resolution. 4. The digital broadcast receiving apparatus according to claim 2, wherein said filter means limits only a horizontal resolution. 5. The program duplication management processing means, as a result of detecting the duplication management capability of the external device connected by the information analysis means, if the external device is capable of duplication management,
If the analyzed result is not copy-prohibited, output is performed without restriction by the program copy management processing means. If the external device is not copy-manageable, the program copy management processing 2. The digital broadcast receiving apparatus according to claim 1, wherein the digital broadcast receiving apparatus outputs the digital broadcast after limiting by means. 6. When the external device connected by the information analysis unit is confirmed to be a device limited to program presentation, the program duplication management processing unit outputs the result analyzed by the information analysis unit. The program information is supplied to an external device as it is, regardless of the case.
Digital broadcast receiver according to any one of the above. 7. When the information output means is a built-in information presenting means, the program duplication management processing means presents the input program information as it is with respect to the information presenting means. Item 7. A digital broadcast receiving device according to any one of Items 1 to 6.