JP2000152214A - Data processing method, data processing unit and data storage medium - Google Patents

Abstract

PROBLEM TO BE SOLVED: To selectively apply encryption processing with respect to object data to an object to be protected being an object of copyright protection. SOLUTION: The data processing unit is provided with a plurality of data compression means 11-16 that conduct comparator circuit processing of each of object data corresponding to each of plurality of objects configuring a scene, a multiplexer means 17 that applies multiplex processing to scene description data and compression object data to provide an output of a multiplexed bit stream MB, and a scramble means 18a that applies encryption processing scrambling an individual stream corresponding to an object to be protected being an object of copyright protection to the multiplex bit stream MB so as to generate an encrypted bit stream SB, and the encrypted bit stream SB is outputted to a data recoding medium 19b or a data transmission medium 19a.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a data processing method and a data processing apparatus, and more particularly to a method for restricting illegal copying of information represented by digital image data, digital audio data, other digital data, and the like. The present invention relates to a countermeasure for rights protection and a data transmission / reception process for enabling the information to be used by charging control. Further, the present invention relates to a data storage medium storing a program for performing the data transmission / reception processing by software, and a data storage medium storing digital data subjected to the processing for restricting the illegal copy. is there.

[0002]

2. Description of the Related Art In recent years, with the progress of digitization of image data, the digital data has the property of not deteriorating the image quality even when copied, so that copyright protection of an image represented by the digital data is required. ing. Further, image copyright protection is closely related to charging control for the use of image data, and the conditional access system put into practical use in digital satellite broadcasting is also a type of copyright protection method for image data. You can think.

[0003] Referring to the drawings, a conditional access system for digital satellite broadcasting (Asada, Inoue et al., "System for digital satellite broadcasting", Matsushita Technical Journal Vo
l.44, No. 1, Feb. 1998). In this digital satellite broadcasting, MPEG (Moving Picture Exposure) is used.
(erts Group) 2 standards and a compression system and a multiplex system are used.

FIG. 9 is an explanatory diagram of a conventional conditional access system, and shows a data transmission / reception system employing the conditional access system. This data transmission / reception system 1000
Is a data transmitting side device 81 which performs image data (video data) Dvi and audio data Dau by performing compression processing, multiplexing processing and scrambling processing on these data in accordance with the MPEG2 system, and transmits the data. Scrambled data (transmitted data)
And a data receiving side device 91 for receiving and reproducing Sg.

The data transmission side device 81 performs an MPEG2 system compression process on the audio data Dau and outputs compressed audio data EDau, and performs an MPEG2 system compression process on the video data Dvi. A video encoder 83 for outputting compressed video data EDvi through the encoders 82 and 8
And multiplexing means 84 for packetizing the data EDau and EDvi output from 3 with a certain bit length to generate data packets, multiplexing a plurality of data packets and outputting a multiplexed bit stream MB. .
The packetization of the compressed data is performed separately for each program so that only one data of the same program is stored in one packet, and which program data is stored in the header of each packet. Is added.

Further, the data transmission side device 81 performs a scrambling process using a scrambling key Ks (t) on a predetermined portion of each data packet included in the multiplexed bit stream MB, and outputs an encrypted bit stream SB. A scrambler 85, and encrypting the scramble key Ks (t) with the work key KW to generate an encrypted scramble key Ks
(t) m, and generates the encrypted scramble key Ks (t) m as E
A scramble key encrypting unit 86 that stores and outputs it in a CM (Entitlement control message) packet, encrypts the work key KW with a master key KMm to generate an encrypted work key KWm, and converts the encrypted work key KWm into an EMM
(Entitlement management message) and has a work key encrypting unit 87 for storing and outputting the packet.

[0007] Further, the data transmission side device 81 transmits the encrypted bit stream SB (data packet), EC
A packet multiplexing unit 80 multiplexes the M packet and the EMM packet to generate multiplex transmission data Sg. The data transmitting side device 81 includes a scramble key generation unit (not shown) for generating a scramble key Ks (t) updated at regular intervals, and a work key generation unit (not shown) for generating the work key KW. Z). Further, the data transmission side device 81 has a master key storage unit (not shown) for storing a master key KMm to be supplied to the work key encryption unit 87.

On the other hand, the data receiving side device 91 receives the multiplexed transmission data Sg, and separates an encrypted bit stream SB (data packet), an ECM packet and an EMM packet contained in the multiplexed transmission data Sg into a packet separating section 90. have.

[0009] Further, the data receiving side device 91 transmits the encrypted work key KWm stored in the EMM packet.
A work key decryption unit 97 that decrypts the ECM packet with the master key KMm to generate a work key KW, and decrypts the encrypted scramble key Ks (t) m stored in the ECM packet with the work key KW to generate a scramble key. The scramble key decryption unit 96 for generating Ks (t) and the scramble key Ks for the scrambled portion of the data packet constituting the cipher bit stream SB
and a descrambler 92 for performing a descrambling process using (t) to generate a decoded bit stream DB.

[0010] Further, the data receiving side device 91 converts the compressed audio data E from the decoded bit stream DB.
Separating means 93 for separating and extracting Dau and compressed video data EDvi, an audio decoder 94 for performing expansion processing on the compressed audio data EDau to generate reproduced audio data RDau,
and a video decoder 95 that performs a decompression process on the vi to generate reproduced video data RDvi. Although not shown, the data receiving side device 91 has a master key storage unit for storing a master key KMm to be supplied to the work key decryption unit.

FIG. 10 shows the structure of the multiplex transmission data Sg (FIG.
(a)), the configuration of a data packet constituting the encrypted bit stream SB (FIG. (b)), and the configuration of an ECM packet (FIG.
(c)) and the configuration of the EMM packet (FIG. (d)).
The multiplex transmission data Sg includes, for example, as shown in FIG. 10A, the data packet 100a (i) [i = 1,
, 6, 7, 8,...], An ECM packet 110a (t) [t = 1, 2,...], And an EMM packet 120a.

Here, the data packet 100a
(1), 100a (2), 100a (3), ..., 100a
(6), 100a (7), and 100a (8) are the first to eighth data packets included in the cipher bit stream SB. The multiplexed bit stream MB includes data packets storing compressed video data and compressed audio data corresponding to various program data. For this reason, it goes without saying that the multiplex transmission data Sg shown in FIG. 10A includes those corresponding to various program data as data packets, ECM packets, and EMM packets constituting the encryption bit stream. .

Hereinafter, the configuration of each of the above packets will be briefly described. The data packet 100a (i) is shown in FIG.
As shown in FIG. 0 (b), it is composed of a header 100 at the head, an adaptation field 101 indicating attribute information of data following the header 100, and a data portion called a payload 102 following the adaptation field 101. The compressed audio data EDau and the compressed video data EDvi are stored in the payload 102 of each of the data packets 100a (i).
00a (i) is a scramble processing area to which scramble processing has been applied.

The ECM packet 110a (t)
Is composed of a header 110 and a key storage unit 111 in which an encrypted scramble key Ks (t) m is stored. The EMM packet 120a includes a header 120 and a key storage unit 121 in which an encrypted work key KWm is stored. The scramble key Ks (t) is updated as time t elapses. The scramble key Ks updated at t2
(1) The scramble key Ks (2) is encrypted with the work key KW.

In the data transmission / reception system 1000 as described above, charging control is performed for each program data. In other words, for paid programs that require a contract, etc., only the specific viewer who made the contract can view it.
The program data is subjected to a scramble process to provide a kind of copyright protection for specific program data.
Therefore, it is difficult for ordinary viewers who have not made a contract to normally reproduce and view the contents of the program for paid programs that require a contract or the like.

More specifically, the cipher bit stream S
The scrambling process is performed on the payload 102 of the data packet corresponding to the above-mentioned pay program in B, so that ordinary viewers cannot normally view the pay program. In addition, each data packet 1
00a (i) header 100 has its payload 102
Is given a scramble identifier F (i) indicating whether or not a scramble process has been performed.

Next, the operation will be described. In the data transmission side device 81, when video data Dvi and audio data Dau corresponding to various programs are input, these data are subjected to MPEG2 compression processing by a video encoder 83 and an audio encoder 82, respectively. Thus, compressed video data EDvi and compressed audio data EDau are generated. Then, each compressed data EDvi
The EDau is stored in a data packet by the multiplexing means 84 in a unit of a fixed packet length by the multiplexing process of the MPEG2 system, that is, by a fixed bit length. It is output as a stream MB.

When the multiplexed bit stream MB output from the multiplexing means 84 is input to the scrambler 85,
In the scrambler 85, the multiplexed bit stream MB
The scrambling process is performed on the payload 102 of the data packet 100a (i) corresponding to the program data to be subjected to charging control, and the charging control bit stream (encryption bit stream) S corresponding to the multiplexed bit stream is obtained.
B is output.

Hereinafter, the scrambling process will be described in detail. As described above, the multiplexed bit stream MB obtained by subjecting the compressed audio data EDau and the compressed video data EDvi corresponding to each program to multiplex processing in packet units is converted into a scramble key Ks (t) by the scrambler 85. Is performed, that is, the data is encrypted and output to the packet multiplexing unit 80 as an encrypted bit stream SB. At this time, the above-mentioned scramble key Ks (t) is updated at an interval of several seconds to several tens of seconds for its security by its generating unit (not shown). Note that the above-mentioned scramble key Ks (t) indicates time-series data, that is, a set of scramble keys such as the above-described scramble keys Ks (1) and Ks (2) updated at regular time intervals.

The scramble key Ks (t) is further encrypted by the scramble key encryption unit 86 based on the work key KW. And the encryption scramble key Ks (t) m is
Data packet 1 constituting the above cipher bit stream
It is stored in an ECM packet 110a (t) different from 00a (i) and output to the packet multiplexing unit 80.

The work key KW is stored in the work key encryption unit 8.
7, a key storage unit (not shown) of the data processing device 1000
Is encrypted with the master key KMm stored in the. The encrypted work key KWm is stored in the data packet 100.
a (i) and the ECM packet 110a (t) are stored in an EMM packet 120a different from the packet multiplexing unit 80a.
Is output to The master key KMm is a key that differs for each viewer, and is distributed in advance to the receiver (data receiving side device) 91 by a physical method such as an IC card, and is stored in a key storage unit (see FIG. (Not shown). Therefore, one work key KW includes a plurality of different master keys K corresponding to a plurality of receivers (viewers).
Mm. In the packet multiplexing unit 80, the data packet 100a (i), ECM
The packet 110a (t) and the EMM packet 120a are multiplexed and transmitted as multiplex transmission data Sg.

On the other hand, when the data receiving side device (receiver) 91 receives the multiplex transmission data Sg including the scrambled program data broadcast in real time and the encrypted scramble key Ks (t) m, From the multiplex transmission data Sg, a data packet 100a (i) corresponding to a required program, an ECM packet 110a (t),
And the EMM packet 120a are separated. Then, in work key decryption section 97, encrypted work key KWm stored in EMM packet 120a is decrypted by master key KMm held in this receiver, and work key KW obtained by this decryption is received. Held on board.

In the scramble key decryption section 96,
The encrypted scramble key Ks (t) m is decrypted by the work key KW held in the receiver, and the scramble key Ks (t) obtained by the decryption is output to the descrambler 92. Further, the descrambler 92 uses the scramble key Ks (t) to add the payload 102 of the data packet 100a (i) to the encrypted bit stream SB.
Is subjected to a descrambling process for canceling the scrambling process, and a decoded bit stream DB is generated. The separating means 93 extracts the compressed audio data EDau and the compressed image data EDvi from the decoded bit stream DB.

Thereafter, the compressed audio data EDau
The compressed image data EDvi and the compressed image data EDvi are subjected to expansion processing by an audio decoder 94 and a video decoder 95, respectively, and the decoders 94 and 95 output reproduced audio data RDau and reproduced image data RDvi.

[0025]

However, the configuration of the conventional data transmission / reception system as described above has the following problems. Briefly, in an MPEG4 compliant coding system, which is being standardized as an international standard for image compression technology, an image signal corresponding to one scene (an image corresponding to one frame) is converted into a plurality of images constituting the scene. And the image signal is compressed for each object.

On the other hand, MP which has already been standardized
In an encoding method based on EG2 (hereinafter, also simply referred to as MPEG2), a scene has one image object. If an audio object is also included as a scene object, the objects that make up the scene are two objects: an image object and an audio object.
However, since the sound is attached to the image, the MPEG playback is considered from the viewpoint that the reproduction of the scene is the reuse of the image corresponding to the scene.
The scene in 2 can be regarded as being composed of one image object.

By the way, in an encoding system conforming to MPEG4 (hereinafter simply referred to as MPEG4), an image signal corresponding to a scene is separately encoded for each object constituting the scene, and a decoding system compatible with MPEG4 is used. Since the encoded data corresponding to each object is decoded for each object, it is necessary to manage the copyright not for the entire scene but for each object constituting the scene. That is, some objects that make up a scene can be copied without the need for copyright protection, and MPEG4 requires copyright management on an object-by-object basis.

For example, if at least one object requiring copyright protection is included in a plurality of objects constituting a scene, all the objects constituting the scene are processed in the same manner as data handled by MPEG2. A method of performing scrambling processing on object data corresponding to.

However, in this case, descrambling of each object data is performed only by performing a single decryption process on the object data corresponding to all the objects. In addition, since the object data corresponding to each object constituting the scene can be individually separated, when the descrambling of each object data is performed, the object to be protected by the copyright can be extracted from the scene. Becomes possible. In this case, it is easy to use an object extracted from the scene as one of a plurality of objects constituting another scene.

Further, in the data transmission / reception system based on MPEG4, even if an object subject to copyright protection is illegally used, it is difficult to prove the illegal use. There is a concern that the situation will be increased. As described above, in a method in which scramble processing for image data of a scene including an object requiring copyright protection is performed uniformly for all objects constituting the scene, a data transmission / reception system based on MPEG4 requires a copyright protection method. There has been a problem that sufficient protection against unauthorized use of an object to be protected cannot be performed.

The present invention has been made in order to solve the above-described problems. Among a plurality of objects constituting a scene, an object such as an object to be protected by a copyright, etc.
The scrambling process can be individually performed only for a specific object set in advance.
It is an object of the present invention to provide a data processing method and a data processing device capable of sufficiently protecting an object subject to copyright protection from unauthorized use in a data processing system compliant with the ISO 4 standard.

Further, the present invention provides a data processing for processing object data corresponding to a plurality of objects constituting a scene so as to prevent unauthorized use of the specific object and outputting the data to a transmission medium or a recording medium. It is another object of the present invention to obtain a data storage medium storing a program to be realized by software, and a data storage medium storing data output by the data transmission processing.

Also, the present invention provides a data processing method and a data processing method which make it difficult to illegally copy image data corresponding to a specific object requiring copyright protection among a plurality of objects constituting a scene. The aim is to obtain a device.

[0034]

A data processing method according to the present invention (claim 1) includes a plurality of objects including object data as image data or audio data corresponding to each of a plurality of objects constituting a scene. A data processing method for recording or transmitting data and scene description data describing how the plurality of objects compose the scene, wherein at least a predetermined identification of the plurality of objects is performed. It includes an encryption process for encrypting object data corresponding to an object, and thereafter, a data output process for outputting the object data and the scene description data to a recording medium or a transmission medium.

According to a second aspect of the present invention, in the data processing method according to the first aspect, in the data output processing, it is determined whether or not object data corresponding to any of the plurality of objects is encrypted. Is included in the scene description data and output to a recording medium or a transmission medium.

According to a third aspect of the present invention, in the data processing method according to the first aspect, in the data output processing, control information necessary for the encryption processing is included in the scene description data or recorded on a recording medium or transmitted. Output to a medium.

According to a fourth aspect of the present invention, in the data processing method according to the first aspect, in the encrypting process, only the object data corresponding to the specific object among the scene description data and the plurality of object data is included. It is to be encrypted.

According to a fifth aspect of the present invention, in the data processing method according to the first aspect, in the encrypting process, object data corresponding to a plurality of specific objects is encrypted. In this case, a plurality of different types of control information corresponding to each of the plurality of specific objects are used as the control information necessary for the control.

According to a sixth aspect of the present invention, in the data processing method according to the first aspect of the present invention, in the encrypting process, as time elapses after the start of the encryption of the object data,
The type of control information required for the encryption processing is changed.

According to the data processing method of the present invention (claim 7), a plurality of object data including object data as image data or audio data corresponding to each of a plurality of objects constituting a scene;
And a data processing method for recording or transmitting scene description data describing how the plurality of objects compose the scene, and compressing object data corresponding to each of the plurality of objects composing the scene. Compression processing for outputting compressed object data, and then sequentially compressing at least compressed object data corresponding to a predetermined specific object among the plurality of objects for encryption corresponding to each specific object. An encryption process for encrypting using the control information; and thereafter, a data output process for outputting the object data and the scene description data to a recording medium or a transmission medium. Control information corresponding to the target object Before encrypting the object data, encrypt the object data with control information corresponding to the encrypted object whose object data has already been encrypted, and add the encrypted control information to the object data corresponding to the encrypted object. It is.

According to the data processing method of the present invention (claim 8), a plurality of object data including object data as image data or audio data corresponding to each of a plurality of objects constituting a scene;
And a data processing method for recording or transmitting scene description data describing how the plurality of objects compose the scene, and compressing object data corresponding to each of the plurality of objects composing the scene. Compression processing for outputting compressed object data, and then sequentially compressing first control information for encryption of at least compressed object data corresponding to a predetermined specific object among the plurality of objects. And a data output process for outputting each of the compressed object data and the scene description data to a recording medium or a transmission medium. With the second control information for encryption, and the encrypted first Control information is divided into a plurality of pieces of partial information so as to correspond to the number of the specific objects, and a process of adding each of the pieces of partial information to the object data of each specific object to which the information corresponds. It is.

According to the data processing apparatus of the present invention (claim 9), a plurality of object data including object data as image data or audio data corresponding to each of a plurality of objects constituting a scene;
And a data processing device for recording or transmitting scene description data describing how the plurality of objects compose the scene. The data processing device is provided in correspondence with each of the objects, and compresses each of the object data. A plurality of data compression means for outputting compressed object data, a multiplexing means for multiplexing the scene description data and each compressed object data as an individual stream and outputting a multiplexed bit stream, Encryption means for performing an encryption process for encrypting an individual stream corresponding to a predetermined specific object among the objects of (i) and (ii) to generate an encrypted bit stream. Output to recording media or data transmission media That.

According to the data processing method of the present invention (claim 10), a plurality of object data including object data as image data or audio data corresponding to each of a plurality of objects constituting a scene; For scene description data describing how the object composes the scene,
A data processing method for reading an encrypted bit stream obtained by performing an encryption process for encrypting object data for at least a predetermined specific object from a recording medium or receiving and reproducing the same via a transmission medium, and reproducing the encrypted bit stream. Then, it is determined whether or not the scene description data and each object data have been subjected to an encryption process, and according to the determination result, the encrypted bit stream A reproduction process including encryption / decryption and display of each object data is performed.

The data processing apparatus according to the present invention (claim 11) comprises a plurality of object data corresponding to each of a plurality of objects constituting a scene, including object data as image data or audio data, and the plurality of object data. For scene description data describing how the object composes the scene,
A data processing device for reading an encrypted bit stream obtained by performing an encryption process for encrypting object data for a predetermined specific object from a recording medium or receiving and reproducing the same via a transmission medium, comprising: An encryption / decryption means for performing encryption / decryption processing for decrypting the encrypted scene description data or object data on the encrypted bit stream based on the first control signal to generate decrypted data; A display means for displaying the scene with the decrypted data based on the control signal, and whether or not the scene description data and each object data have been subjected to encryption processing upon receiving the encrypted bit stream. Depending on the encryption and decryption of the encrypted data and the As the process is performed, in which the decryption means and display means, and control means for controlling by the first and second control signals.

A data storage medium according to the present invention (claim 12) includes a plurality of object data including object data as image data or audio data corresponding to each of a plurality of objects constituting a scene; A data storage medium storing a data processing program for performing, by a computer, data processing on scene description data describing how an object composes a scene, wherein the data processing program stores at least one of the plurality of objects. The computer is configured to perform a process of encrypting object data corresponding to a predetermined specific object, and then a process of outputting the object data and the scene description data to a recording medium or a transmission medium. A.

A data storage medium according to the present invention (claim 13) is a data storage medium in which digital data for reproducing a scene is recorded, wherein the digital data is stored in a plurality of objects constituting the scene. A plurality of object data corresponding to each, including a plurality of object data including object data as image data or audio data, and scene description data describing how the plurality of objects compose the scene, and are set at least in advance. This is data obtained by performing encryption processing on object data corresponding to a specific object.

According to the data processing method of the present invention (claim 14), a plurality of object data including object data as image data or audio data corresponding to each of a plurality of objects constituting a scene; For scene description data describing how the object composes the scene,
A data processing method for reading an encrypted bit stream obtained by performing an encryption process for encrypting object data for at least a predetermined specific object from a recording medium or receiving and reproducing the same via a transmission medium, and reproducing the encrypted bit stream. Detecting whether or not the encrypted object data corresponding to the specific object can be reproduced, and only when the encrypted object data is in a reproducible state, the encrypted object data corresponding to the specific object can be reproduced. The reproduction processing is performed on all the object data including the decryption of the object data and display of the object data.

According to the data processing method of the present invention (claim 15), a plurality of object data including object data as image data or audio data, corresponding to each of a plurality of objects constituting a scene, are compressed to form a plurality of data. Compressed object data corresponding to at least a predetermined specific object is generated for the compressed object data and scene description data describing how the plurality of objects constitute the scene. A data processing method of reading an encrypted bit stream obtained by performing an encryption process for encrypting data from a recording medium or receiving and receiving the same via a transmission medium, wherein the encryption bit stream corresponds to the specific object. Compressed object data can be played State or not, and only when the encrypted compressed object data is in a reproducible state, encrypts and decrypts the encrypted compressed object data corresponding to the specific object, and decrypts the compressed object data. The reproduction processing is performed on all the object data including the expansion and display.

[0049] According to the present invention (claim 16), in the data processing method according to claim 15, the reproducible state of the encrypted object data is determined by changing all the encrypted compressed object data corresponding to the specific object. , Which can be read from the recording medium or can be received via the transmission medium.

According to a seventeenth aspect of the present invention, in the data processing method according to the fifteenth aspect, the reproducible state of the encrypted object data is determined by reading the scene description data from the recording medium or the transmission medium. In which all of the encrypted compressed object data corresponding to the specific object can be read from the recording medium or can be received via the transmission medium. .

According to the present invention (claim 18), in the data processing method according to claim 15, the reproducible state of the encrypted object data is determined by reading the scene description data from the recording medium or the transmission medium. And all the object data including the encrypted compressed object data corresponding to the specific object can be read from the recording medium or can be received via the transmission medium. It is what it was.

According to a nineteenth aspect of the present invention, in the data processing method according to the fifteenth aspect, the reproducible state of the encrypted object data is determined by using the scene description data and all the object data constituting the scene. It is in a state of being read from the recording medium or received from the transmission medium.

According to the data processing method of the present invention (claim 20), a plurality of object data including object data as image data or audio data corresponding to each of a plurality of objects constituting a scene is compressed and compressed. Object data is generated, and the compressed object data and the scene description data describing how the plurality of objects compose the scene are compressed object data corresponding to at least a predetermined specific object. The encrypted bit stream obtained by performing the encryption process for encryption is
A data processing method for reading from a recording medium or receiving and reproducing via a transmission medium, wherein the encryption bit stream is subjected to encryption / decryption processing for canceling the encryption processing and corresponds to the specific object. The method includes a data generation process for generating compressed object data, and a decompression process for decompressing all the compressed object data constituting the scene to generate decompressed object data. Writes and reads the restored object data to and from the reference memory, performs a secondary encryption process on all the restored object data when writing to the memory, and reads the restored object data from the memory. In the read-out restored object data, Such is intended to apply a decryption process for decrypting process.

In the data processing method according to the present invention (claim 21), a plurality of object data including object data as image data or audio data corresponding to each of a plurality of objects constituting a scene is compressed and compressed. Object data is generated, and for the compressed object data and scene description data describing how the plurality of objects compose the scene, at least compressed object data corresponding to a predetermined specific object is generated. The encrypted bit stream obtained by performing the encryption process for encryption is
A data processing method for reading from a recording medium or receiving and reproducing via a transmission medium, wherein the encryption bit stream is subjected to encryption / decryption processing for canceling the encryption processing and corresponds to the specific object. A data generation process for generating compressed object data; and a decompression process for decompressing all the compressed object data constituting the scene to generate decompression object data. The decompression process includes a decompression process corresponding to each object. The object data is written to the reference memory corresponding to each object, read from the corresponding reference memory as necessary, and further subjected to a secondary encryption process for the restored object data when writing to the memory. And when reading from the memory,
Data processing for performing decryption processing for decrypting the secondary encryption processing on the read restored object data is performed independently for each memory.

The data processing apparatus according to the present invention (claim 22) compresses and compresses a plurality of object data corresponding to each of a plurality of objects constituting a scene, including object data as image data or audio data. Object data is generated, and object data corresponding to at least a predetermined specific object is encrypted with respect to the compressed object data and scene description data describing how the plurality of objects constitute the scene. A data processing device for reading an encrypted bit stream obtained by performing an encryption process for encrypting the data, reading the encrypted bit stream from a recording medium or receiving the encrypted bit stream via a transmission medium, and reproducing the encrypted bit stream. Perform decryption processing to cancel decryption processing Encryption / decryption means for generating data, and a plurality of data which are provided corresponding to each of the objects and perform decompression processing on compressed object data of the corresponding object included in the decrypted data to generate decompressed object data Decompressing means, and a plurality of memories provided corresponding to the respective objects and storing decompressed object data of the corresponding objects, wherein each of the data decompressing means outputs the decompressed object data to the corresponding memory. An encryption unit for performing a secondary encryption process on the decompressed object data;
An encryption / decryption unit that performs an encryption / decryption process on the decompressed object data read from the memory to release the secondary encryption process.

The data processing method according to the present invention (claim 23) includes a plurality of object data including object data as image data or audio data corresponding to each of a plurality of objects constituting a scene; For the scene description data that describes how the object
At least an encrypted bit stream obtained by performing an encryption process for encrypting object data corresponding to a predetermined specific object is read from a recording medium or received via a transmission medium to display image data. A data processing method for reproducing an encrypted bit stream including: extracting scene description data from the encrypted bit stream; and displaying an image using only the object data corresponding to the specific object based on the scene description data. Is to limit.

According to the data processing method of the present invention (claim 24), a plurality of object data including object data as image data or audio data corresponding to each of a plurality of objects constituting a scene; For scene description data describing how the object composes the scene,
At least an encrypted bit stream obtained by performing encryption processing for encrypting object data corresponding to a predetermined specific object is read from a recording medium or received via a transmission medium to display image data. A data processing method for reproducing an encrypted bit stream including: determining whether all of the encrypted object data corresponding to the specific object has been decrypted, and determining whether the encrypted object data corresponding to the specific object has been encrypted. The image display of the object data corresponding to the specific object is performed only when all the object data is decrypted.

[0058]

Embodiments of the present invention will be described below. Embodiment 1 FIG. FIG. 1 is a block diagram for explaining a configuration of the data processing device according to the first embodiment of the present invention.
The data processing device 1001 according to the first embodiment
This is a data transmitting side device configured to perform encoding processing, encryption processing, and multiplexing processing on an image signal Dg according to an encoding system conforming to ISO 4 and output transmission data Sg obtained by these processings. The image signal input to the data processing device 1001 corresponds to a moving image corresponding to various programs, and the encoding process of the image signal corresponding to each program is performed in a time-division manner. ing. Further, the data processing apparatus 1001 is configured to perform an encoding process (compression process) on an image signal Dg corresponding to each frame (one scene) of a moving image for each object constituting each scene. .

The data processing device 10 will be described in detail below.
01 is provided in correspondence with each of a plurality of objects constituting the scene, based on a plurality of object compression means for compressing object data corresponding to each object, and an image signal Dg corresponding to the scene. A scene description transmitting unit 10 for generating and transmitting scene description data Dsd describing how each object composes the scene. Further, the data processing device 1001 generates an object data (object data) that generates image data (object data) corresponding to each object constituting the scene based on the image signal Dg corresponding to the scene. have.

FIG. 2 shows one scene (FIG. (A)) of the moving image and its hierarchical structure (FIG. (B)). Here, the scene 20 is composed of six objects, 21 to 26. In this case, in the data processing device 1001, the object data Do1 to Do6 corresponding to the first to sixth objects 21 to 26 are set.
Are respectively compressed by the first to sixth object compression means, and the first to sixth objects 2
Compressed object data EDo1-E corresponding to 1-26
Do6 is output. The object shown in FIG.
(1) compression means 11, object (2) compression means 12, ...
, And the object (6) compression means 16 are the first, second,..., And sixth object compression means, respectively. Therefore, the data processing apparatus 1001 can perform encoding processing on an image signal corresponding to a moving image including up to six objects.

Further, the data processing device 1001 is provided with the compressed object data ED from each of the compression means 11 to 16.
o1 to EDo6 and the scene description data Dsd are packetized and multiplexed in units of a fixed-size bit length based on the control signal, and a multiplexing unit 17 for outputting a multiplexed bit stream MB; The transmission-side copyright protection device 18 that performs scramble processing and packet multiplexing processing on the bit stream MB and outputs transmission data corresponding to the output of the packet multiplexing unit 80 shown in FIG. 9 to the transmission medium 19a or the recording medium 19b. And Here, the transmission-side copyright protection device 18 includes a scrambler 18a for encrypting the multiplexed bit stream MB, and a CPU (central processing unit) 18b for outputting the control signals.

The scrambler 18a, as an encryption process of the multiplexed bit stream MB, outputs a protected object (a preset object) which is a subject of copyright protection among a plurality of objects (n) constituting one scene. The compressed object data (n) corresponding to the specified specific object) is encrypted by a scramble key Ks (n ′) corresponding to each protected object. Further, the CPU 18b is provided with the multiplexing unit 1.
7 and a process for controlling the scrambler 18a, a process for encrypting the scramble key Ks (n ') with the work key KW to generate an encrypted scramble key Ks (n') m, and It is configured to perform processing for encrypting with the key KMm and generating an encrypted work key KWm. Here, the master key KMm is different for each contract viewer who has made a viewing contract for a given program, and the master key KMm corresponding to each contract viewer is different.
Are stored in a key storage unit (not shown) of the data processing device 1001.

The CPU 18b is adapted to correspond to each object based on protection designation information set in advance by a user of the data processing device 1001 and stored in an information storage unit (not shown) of the data processing device 1001. As the access right information in the object descriptors OD1 to OD5 (see FIG. 4B), a protection flag indicating copy prohibition or copy permission is set.

A supplementary description of the scene 20 shown in FIG. 2 will be given. FIG. 2A shows a scene 20 which is an image of one frame of a moving image.
Are grouped so as to belong to one of three layers L1 to L3, as shown in FIG. 2B. That is, the image object 21 and the audio object 22 as the background belong to the upper first hierarchy L1, and the image object 23 and the character object 26 as the foreground belong to the lower second hierarchy L2. Two image objects 24 and 25 attached to the image object 23 as the foreground belong to the lower third hierarchy L3.

Next, the function and effect will be described. MPEG
In the encoding method based on the scene (1), as shown in FIG.
When transmitting image data Dg corresponding to an image (frame or the like) 20, the image data Dg is divided so as to correspond to an object (object) constituting the scene. The image data (object data) Do1, Do2,..., Do6 corresponding to each object is subjected to compression processing for each object.

Specifically, in the data processing apparatus 1001 on the data transmission side, for example, object data (specifically, image data, audio data, character data) corresponding to the objects 21 to 26 constituting the scene 20 are stored.
, Do6 are separately compressed for each object by the corresponding object compression means 11, 12,..., 16 to obtain compressed object data EDo1, ED
o2, ..., EDo6 are output.

In the data processing device 1001 on the transmitting side, the scene description sending means 10 configures the scenes 20 by the objects 21 to 26 based on the image data Dg corresponding to the scenes 20. The scene description data Dsd describing the above is generated. The scene description data Dsd informs the data processing device on the data receiving side of the number of objects constituting the scene 20, the display position, the display timing, and the like.

Then, the compressed object data ED
o1, EDo2, ..., EDo6 and scene description data Dsd
Is input to the multiplexing unit 17, the multiplexing unit 17 performs a packetization process on the data to generate a plurality of data packets. Further, the multiplexing unit 17 converts each data packet into a transmission path (transmission medium).
Multiplex processing for multiplexing the data into the optimal format is performed on the storage medium 19a or the storage medium 19b, and a multiplexed bit stream MB is output. Here, the packetization processing is performed by the data EDo1, EDo2,.
This is a process in which o6 and Dsd are divided for each fixed bit length and stored in a plurality of data packets.

FIG. 3A shows the multiplexed bit stream M
B shows an example. Usually, the multiplex bit stream M
In B, a data packet storing the scene description data Dsd is arranged at the head thereof, and subsequently, a compressed object data E corresponding to each of the objects 21 to 25 is placed.
Data packets storing Do1 to EDo5 are repeatedly arranged. As the size of the data packet, an optimum size is selected according to the transmission medium or the storage medium. However, the packet size may be changed for each object even if the packet size is fixed for all objects. . The packet size is
It may be changed over time.

In the compressed object data EDo6 corresponding to the character object 26, the bit string corresponding to the character object 26 is shorter than that corresponding to the other objects. Therefore, in the multiplexed bit stream MB, the scene description data Dsd It is inserted into the stored data packet.

For example, scene description data Dsd and compressed object data EDo6 are stored in the data packet Psd. Data packets P (1) o1 and P (2) o1 store compressed object data EDo1. The compressed object data E is included in the data packets P (1) o2 and P (2) o2.
Do2 is stored. The data packet P (1) o5 stores compressed object data EDo5.

Further, when the multiplexed bit stream MB is input to the transmission-side copyright protection device 18,
In the device 18, a control signal from the CPU 18b
The multiplexed bit stream MB is selectively scrambled for each object, and the transmission data Sg (see FIG. 10A) corresponding to the output of the packet multiplexing unit 80 shown in FIG. Alternatively, the storage medium 19
b. Here, the scene description data Dsd and the compressed object data E corresponding to the image object
Different scramble processing is performed on Do1, EDo3, EDo4, and EDo5, respectively, and scramble processing is not performed on the compressed object data EDo2 corresponding to the audio object. In this case, the compressed object data EDo2 corresponding to the audio object (2) can be reproduced without performing the descrambling process, and can be easily copied after the reproduction.

FIG. 3B shows an example of the encrypted bit stream SB included in the transmission data Sg. In the encrypted bit stream SB, the scene description data D
A data packet P'sd storing sd is arranged, and subsequently, each of the compressed object data EDo1, EDo2,.
.., data packet P '(1) o1, storing EDo5
P '(2) o1, P (1) o2, P (2) o2,..., P' (1) o5 are repeatedly arranged.

In the encrypted bit stream SB, the objects (1), (3), (4),
The data part of each data packet corresponding to (5) (the area where the compressed object data EDo1, EDo3, EDo4, and EDo5 are stored) is scrambled. The data area of the data packet storing the scene description data Dsd is also scrambled.

For example, the data packet P'sd is composed of a header Hsd and a data part Rsd that stores scene description data Dsd following the header Hsd, and the data part Rsd has been subjected to scramble processing. Also, the data packet P ′ (1) o
1, P ′ (1) o5 are headers Ho1 and Ho5 and a data portion R storing compressed object data EDo1 and EDo5, respectively.
The data portions Ro1 and Ro5 are scrambled. Also, each data packet P (2) corresponding to the object (2) which is not the object of copyright protection
o2 includes a header Ho2 and a data part Ro2 storing the compressed object data EDo2, and the data part Ro2 has not been subjected to scramble processing. The data portions Rsd, Ro1, Ro2, and Ro5 correspond to the payload 102 of the data packet 100a (i) shown in FIG. 10B, and in the data packet shown in FIG. Adaptation field 101 of 100a (i)
The part corresponding to is omitted.

In FIG. 3B, the scramble processing for the scene description data Dsd, the compressed object data EDo1, and the compressed object data EDo5 is different from each other using dot display and hatched display.

In such an encrypted bit stream SD in which the compressed object data is separately packetized for each object in one scene, a conventional encrypted bit stream in which the compressed image data corresponding to one scene is simply packetized There are the following effects as compared with.

That is, in the conventional example, since the stream to be scrambled (encrypted) is one piece of compressed image data corresponding to the scene, the control of the scrambling is performed by controlling all objects constituting the scene. On the other hand, it was only possible to perform a uniform control as to whether or not to perform the scramble processing. On the other hand, in the first embodiment, since a stream to be subjected to scramble processing (encryption processing) includes a plurality of pieces of compressed image data corresponding to objects constituting a scene, the scramble processing for the compressed object data is performed. Image objects and audio objects, etc., which can be selectively performed for each object and have no copy restriction, are distinguished from objects requiring copyright protection, and the compressed object data of these objects is given to these objects. Can be prevented from being protected by the scrambling process.

FIG. 4 is an explanatory diagram showing an example of scene description data in MPEG4. The scene description (description indicating how each object constitutes a scene) in MPEG4 includes a scene descriptor SD and object descriptors OD1 to OD5 as descriptors. Scene 20 shown in (b)
(See FIG. 4A).

That is, the following contents are shown in the scene descriptor SD. In other words, the notation “2D object” A1 indicates that the video object 21 and the audio object 22 are included in the first layer L1, and that the second layer L2 indicated by the notation “2D object” A2 exists. Have been. In addition, by the title “2D object” A2, the second layer L2
Contains text object 26 and video object 2
3 is included, and a third hierarchy L3 indicated by the title “2D object” A3 is shown to exist. Further, the title "2D object" A3 indicates that the video object 24 and the video object 25 are included in the third hierarchy L3.
Here, the titles “2D objects” A1 to A3 are:
The objects included in the corresponding layers L1 to L3 are two-dimensional objects. In addition, each of the objects 21 to 21 is included in the scene descriptor SD.
25 corresponding to the object descriptor (1) $ OD1
{Object descriptor (5)} OD5 is included.

Here, for example, the object descriptor (1)
Indicates that the object number of the corresponding object 21 is 1, the stream type is MPEG4 video, and the access right information is copy prohibited. The object descriptor (2) indicates that the object number of the corresponding object 22 is 2, the stream type is MPEG4 audio, and the access right information can be copied. . Other object descriptors (3)
4 to 5 also show the object number, the stream type, the access right information, and the like, as shown in FIG. The object number is for specifying a stream (that is, compressed object data stored in a data packet) corresponding to each object in the multiplexed bit stream MB.

[0082] Transmission-side data processing device 1 of the first embodiment
In 001, since the access right information is added to each object descriptor, the receiving side data processing device (decoding device)
Then, there is no need to directly examine the above-mentioned encrypted bit stream SB to determine whether the stream corresponding to any object is scrambled,
In addition, it is possible to easily perform an operation of extracting only a copyable object from the stream of the encrypted bit stream SB.

Next, referring to FIG. 5, the data processing device 1
The scrambling process and the multiplexing process by the transmission-side copyright protection device 18 in 001 will be described. The flowchart shown in FIG. 5 shows that the copyright protection device 18 performs a scramble process and a multiplex process on the multiplexed bit stream MB (see FIG.
The process of generating transmission data Sg including (see FIG. 3B) is shown.

As a specific method of the scramble processing, a method similar to the conventional example is used. However, the scramble processing of this embodiment differs from the scramble processing in the conventional data processing device in the following points. That is, M
Since the stream (compressed object data) of the PEG4 multiplexed bit stream is divided for each object constituting a scene, the scramble key Ks (t) is used as the number of protected objects (n ') to be copyright-protected. And the scramble process using the corresponding scramble key is performed on the stream (compressed object data) for each protected object. in this case,
The scramble key is defined by two variables, time t and the number of objects (n '), and the scramble key at time t for the n'th protected object is strictly a scramble key Ks (n', t) In the following description, for the sake of simplicity, the scramble key for the n'th protected object to be processed is represented as the scramble key Ks (n ') regardless of time.

That is, when the work key KW is input to the CPU 18b from the key storage unit of the data processing device 1001,
(Step 501) In the CPU 18b, the work key KW
Is the master key KMm corresponding to each viewer from the key storage unit.
And the encrypted work key KWm is stored in the EMM packet and sent to the scrambler 18a.
(Step 502). Next, the CPU 18b generates scramble keys Ks (0) and Ks (1).
3). Then, the CPU 18b encrypts the scramble key Ks (0) with the work key KW, stores the encrypted scramble key Ks (0) m in the ECM packet, and sends it to the scrambler 18a (step 50).
4).

Subsequently, the scene descriptor SD and the object descriptors OD1 to OD5 included in the scene description data Dsd of the multiplex bit stream MB are stored in the scrambler 1
8a via the CPU 8b (step 50).
5). Then, a protection flag is set as access right information in the object descriptors OD1 to OD5 for each object (step 506). That is, the protection flags are set in the object descriptors OD1 and OD3 to OD5 of the protected objects (1) and (3) to (5) to be protected by the copyright, and the access right information is copy-protected. On the other hand, objects that do not need copyright protection (2)
No protection flag is set in the object descriptor OD2, and the access right information can be copied. At this time, the CPU 18b is supplied with protection designation information P (n) indicating which object descriptor of the object has the protection flag set. Note that this protection designation information P (n)
Is set in advance by the user of the data processing device 1001 and is stored in an information storage unit (not shown) of the data processing device 1001.

Next, in the CPU 18b, the scramble key Ks (1) is encrypted with the scramble key Ks (0), and FIG.
As shown in (b), the encrypted scramble key Ks (1) m is added to the header Hsd of the scene description data (step 5).
07). Further, the scrambler 18a encrypts the data portion Rsd of the data packet storing the scene description data with the scramble key Ks (0) and outputs it (step 508). After that, in the CPU 18b,
The count values n and n 'are set to 1 (step 509).

Here, the count value n corresponds to the object number of a plurality of objects constituting the scene. The processing for each object data by the transmission-side copyright protection device 18 is performed in the order of the object numbers. Done in The count value n 'corresponds to the number of times a scramble key is generated each time the protected object is encrypted. Therefore, the object data n is the object data corresponding to the object number (n), that is, the object data of the object represented by the object descriptor (n), and the scramble key Ks (n ') , N'th.

Next, when the packet data (object data stored in the packet) is input to the CPU 18b (step 510), the CPU 18b determines whether or not the input packet data corresponds to a new object. Is determined (step 511).
If this does not correspond to a new object,
The CPU 18b further determines whether or not this corresponds to an object that is subject to copyright protection (step 512).

As a result of the determination, if the packet data corresponds to the object whose copyright is to be protected, the CPU 18b encrypts the compressed object data (n) using the scramble key Ks (n '). And the encrypted object data is output (step 51).
3). Specifically, the data portion of the data packet in which the compressed object data (n) is stored is subjected to the scrambling process using the scramble key Ks (n '). After that, the CPU 18b starts the scramble processing or after updating the previous scramble key Ks (n '),
It is determined whether or not a predetermined time has elapsed (step 520).

On the other hand, if the result of determination in step 512 is that the packet data does not correspond to the object to be protected, the CPU 18b immediately determines in step 520 whether a predetermined time has elapsed.

If the result of determination in step 511 is that the packet data corresponds to a new object, the CPU 18b further checks that the packet data corresponds to an object that is subject to copyright protection. Is determined (step 51).
4). If the result of this determination is that the packet data corresponds to a protected object, the CPU 18b generates a scramble key Ks (n '+ 1) corresponding to the new protected object (step 515).
Then, in the CPU 18b, the scramble key Ks (n '+ 1)
Is encrypted with the scramble key Ks (n '), and the encrypted scramble key Ks (n' + 1) m is output to the scramble means 18a. Further, the scrambler 18a adds the encrypted scramble key Ks (n '+ 1) m to the header of the data packet storing the compressed object data (n) (step 516). And scramble means 1
8a, a scramble key Ks is added to the data portion of the data packet storing the compressed object data (n).
A scrambling process (encryption process) using (n ') is performed (step 517).

By doing so, encrypted object data corresponding to a single object from the encrypted bit stream SB (see FIG. 3B) (that is, stored in a data packet in which the data portion has been scrambled). Extracted compressed object data)
Unscrambling becomes impossible.

More specifically, to descramble the object (4), a scramble key for the object (4) is required, and the scramble key is in the stream of the object (3). Since the scrambling key of the object 4 existing in the header of the stream (data packet) of the object (3) is encrypted with the scrambling key of the object 3, the scrambling key of the object 3 is required. That is, in order to descramble the object (n), streams corresponding to all the objects below the object (n-1) are required. By doing so, if there is no copyright-protected object data transmitted before the predetermined object data, it becomes impossible to descramble the predetermined object, thereby preventing the object from being extracted alone. I have. The scramble key corresponding to each protected object is updated at regular intervals for security as in the conventional example. The update of the scramble key is performed using at least the time required for the scramble process corresponding to the scene (image corresponding to one frame) as a minimum unit. Then, the CPU 18b increments the count values n and n '(step 518), and determines whether a predetermined time has elapsed (step 520).

On the other hand, if the result of determination in step 514 is that the packet data does not correspond to the protected object, the CPU 18b immediately counts n
Is incremented (step 519), and the elapse of a predetermined time is determined (step 520).

If the result of determination in step 520 is that a predetermined time has elapsed, the scramble keys Ks (0) and Ks (1) are updated in step 521, and thereafter, in step 504 520 are performed again. If the result of determination in step 520 is that the predetermined time has not elapsed, the CPU 18b determines whether or not processing of all packet data has been completed.
(Step 522) If not completed, the processing of Steps 510 to 522 by the copyright protection device 18 is performed again, and if completed, the scramble process by the copyright protection device 18 ends.

As described above, in the first embodiment, the compressed object data EDo1, EDo3 to EDo5 corresponding to the protected object to be protected from the copyright among a plurality of objects constituting the scene are subjected to the predetermined processing. After that, the compressed object data EDo1 to EDo6 and the scene description data D
Since the sd is recorded or transmitted, the encryption processing for the object data can be selectively performed on the protected object to be copyright protected.

Further, since the scene description data includes a flag (access right information) corresponding to each object indicating whether or not to protect the copyright, the data reading side or the data receiving side actually stores each object data. By the time it is received, it can be determined whether or not encryption / decryption processing is necessary, and the processing for reproducing object data can be simplified and speeded up.

Further, since a predetermined encryption key (scramble key Ks (n ')) for the above-mentioned encryption processing is recorded or transmitted in the scene description data, the encryption key is encrypted together with the encrypted object data. The key is also transmitted to the data receiving side. Therefore, the data receiving side does not need to hold the encryption key in advance. For example, even if the encryption processing on the data recording side or the transmission side uses a high encryption strength using a large number of encryption keys, the number of encryption keys held on the data reading side or the data reception side increases. There is no effect.

In the encryption processing in which a plurality of objects are subject to copyright protection, the predetermined encryption key (scramble key Ks (n ')) is different from each other corresponding to each of the plurality of objects. Since a plurality of encryption keys are used, it becomes difficult to decrypt the encrypted object data, and as a result, the protection of each protected object by encryption can be enhanced. Further, at the time of the encryption processing, the type of the encryption key used as the predetermined encryption key (scramble key Ks (n ')) is changed with the lapse of time, so that the encrypted object data is decrypted. Therefore, the protection of the protected object by encryption can be enhanced.

In the first embodiment, the scene description in MPEG4 has been described as an example.
The scene description is not limited to this, and any descriptor such as HTML, JAVA, or MHEG in a coding method can be used as long as it is a descriptor indicating the attribute of the object. In FIG. 5, the scene description data Dsd is also scrambled in step 508. However, since the scene description data itself does not include object data, the scramble processing may not be performed. Rights protection is possible.

Further, in the first embodiment, the scramble key is added to the header of the data packet storing the scene description data. However, no scramble key is inserted into the data packet of the scene description data. Alternatively, the scramble key may be added only to the data packet of the object data. Further, the first embodiment
In the scene description data, a flag (access right information) corresponding to the object indicating whether or not to protect the copyright is included, but if the security of the scene description data itself can be maintained, the The scramble key can be added directly or encrypted to the object descriptor.

Embodiment 2 FIG. 6 is a diagram for explaining a data processing device according to the second embodiment of the present invention, and shows a flow of an encryption process (scramble process) by a data processing device on the data transmission side. The data processing device according to the second embodiment is different from the data processing device 10 according to the first embodiment.
01 differs from the content of the scramble processing, that is, only the operation of the CPU 18b for controlling the scrambler 18a.

That is, in the second embodiment, the CPU 1
8b is a first scramble key composed of a bit string having the same length as the scramble key in the first embodiment, instead of the process of generating the scramble key Ks (n ') corresponding to each protected object in the first embodiment. A process for generating Ksa and a second scramble key Ksb composed of a bit string longer than the scramble key in the first embodiment is performed.

Further, in the second embodiment, the compressed object data corresponding to each protected object is the second object.
, And the second scramble key Ksb is encrypted using the first scramble key Ksa. Then, the encrypted second scramble key Ksbm is divided into a plurality of parts (key division parts) Ksbd corresponding to the number of the protected objects, and each key division part is divided into a corresponding protected part. The compressed object data of the object is inserted into a user data area of a data packet storing the object.

Hereinafter, the scrambling process (encryption process) on the multiplexed bit stream MB in the data processing device of the second embodiment will be described. First, when the work key KW is input to the CPU 18b (step 60).
1), the work key KW is encrypted by the master key KMm and transmitted by an EMM packet (step 60).
2). Subsequently, when the scene description data is input to the CPU 18b (step 603), the CPU 18b sets the protection specification information P (n) according to the first embodiment, which indicates which object should be copyright-protected by the user.
, The number n of objects (protected objects) subject to copyright protection is set (step 60).
4).

Next, the CPU 18b differs from the first embodiment in that a scramble key Ksb having a longer bit sequence than the scramble key of the first embodiment and a scramble key Ksa composed of a bit sequence of a normal length are used. Generated (step 605). Further, in the CPU 18b, the scramble key Ksa is encrypted by the work key KW, and the encrypted scramble key Ksa is stored in the ECM packet and sent to the scramble means 18a (step 60).
6).

Subsequently, in the CPU 18b, the scramble key Ksb is encrypted with the scramble key Ksa, and the encrypted scramble key Ksbm is divided into n (step 607). Here, the encrypted scramble key Ksbm is divided into a plurality of scramble key parts (key division parts) by bit division. Specifically, when the scramble key is divided into four, for example, the scramble key “1001000111” is divided into a scramble key divider “100”, a scramble key divider “0001”, and a scramble key divider “11”. You.

Thereafter, the packet data (compressed object data stored in the data packet) is
8b (step 608), the CPU 18b
Then, it is determined whether or not the packet data corresponds to a protected object that is subject to copyright protection (step 609). If the packet data corresponds to the protected object, the scrambler 18a sets the key division portion Ksbd of the scramble key Ksb to the user data of the data packet storing the stream of the protected object (compressed object data). It is inserted into the area or header (step 610). Note that no scrambling process is performed on the user data area or the header area.

Then, the scrambling means 18a performs a scrambling process on the stream (object data) corresponding to the protected object (n) using the scramble key Ksb (step 611). afterwards,
The CPU 18b determines whether or not the processing by the copyright protection device 18 for all the packet data corresponding to one program has been completed (step S612).

On the other hand, if the result of determination in step 609 is that the input packet data does not correspond to the protected object, the CPU
It is determined whether or not processing of all packet data corresponding to one program has been completed (step 612). If the result of determination in step 612 is that processing of all packet data has not been completed, the CPU 18b
In step S615, it is determined whether a predetermined time has elapsed after the start of the scramble process or after the previous update of the scramble key. As a result of the determination in step 615, if the predetermined time has elapsed, the CPU 18b updates the scramble keys Ksa and Ksb (step 614). The key is not updated, and the copyright protection device 18 performs the processing of the above steps 606 to 615 again.

As described above, in the second embodiment, the scramble key Ksbm corresponding to all the protected objects constituting the moving image corresponding to the predetermined program is encrypted with the scramble key Ksa, and then encrypted. The scramble key Ksb is divided so as to correspond to the number of protected objects, and a divided key portion Ksbd obtained by the division is further divided.
Is inserted into the unscrambled user data area of the data packet corresponding to each protected object, and then the stream (compressed object data stored in the data portion of the data packet) of each protected object is The scramble key Ksb is scrambled using the scramble key Ksb, and the scramble key Ksb is transmitted. Therefore, the scramble key Ksb cannot be reproduced unless data packets corresponding to all protected objects are extracted.
In other words, even if only the data packet corresponding to the required protected object is extracted from the cryptographic bit stream, the object data of the required object cannot be reproduced, and the illegal copy of each protected object cannot be performed. Can provide strong defense.

In the second embodiment, when the scramble key Ksb is divided so as to correspond to the number (n) of the protected objects, the bit division of the scramble key Ksb is performed by using keys having different bit lengths obtained by the division. Although the case where the divided part is generated is described, the method of dividing the scramble key is not limited to this. For example, the scramble key Ksb may be divided such that the bit lengths of the key division portions are all the same. In this case, a specific bit (for example, the fourth bit from the head) of the key division part may be replaced so that its value “0” or “1” becomes “1” or “0”. Further, the specific bit of the key division part may be always set to “1” or “0”. The specific bit of the key division portion may be a value obtained by an exclusive OR of the value “1” or “0” and another value “1” or “0”. Also, the specific bits (for example, the fourth bit from the beginning) of the key division part are switched between those corresponding to the object currently being scrambled and those corresponding to the object to be scrambled next. You may. As a result, the method of dividing the bit of the scramble key Ksb may be any method as long as the scramble key Ksb cannot be reproduced unless packet data corresponding to all protected objects is prepared.

In the first and second embodiments, the transmission-side copyright protection device 18 adds the scramble key corresponding to each object to the header or user data area of the data packet storing the corresponding object data. Although the method of transmitting the scramble key is described above, the method of transmitting the scramble key is not limited to this. For example, if the scramble key is highly secure,
The data packet storing the object data may be stored in a different packet and transmitted.

Further, in the first and second embodiments, each of the copyright protection devices 18 has been described in which the scramble process by the CPU 18b is different. However, the scramble process by the copyright protection device 18 is different from the first and second embodiments. It is not limited to what is indicated by 2. For example, the encryption process performed on the protected object by the copyright protection device 18 may be performed on any object if at least all of the encrypted object data corresponding to the protected object to be protected for copyright constituting the scene is not available. Any structure may be used as long as the encrypted object data cannot be decrypted or the encrypted object data corresponding to a single object is extracted but the extracted encrypted object data cannot be decrypted.

Also, in the second embodiment, unlike the first embodiment, the encryption process for the data portion of the data packet corresponding to the protected object is simple, and descrambling is performed for all the protected objects. There are advantages such as a condition that packet data corresponding to the object is prepared, but there are also the following disadvantages. That is, if a portion of the data packet where the key division portion of the scramble key Ksb is inserted is extracted, the scrambling process can be easily decrypted thereafter.

Therefore, in the data transmission / reception system, as the data processing device on the data transmission side, the most suitable one of the data processing device of the first embodiment and the data processing device of the second embodiment is used according to the system configuration. You need to choose.

Embodiment 3 FIG. 7 is a diagram for explaining a data processing device according to the third embodiment of the present invention, and FIG. 7A shows the configuration of the data processing device. The data processing device 1003 according to the third embodiment performs an encoding process, an encryption process, and the like on an image signal corresponding to an image (scene) of one frame constituting a moving image by an encoding method conforming to MPEG4. This is a data receiving side device that receives the obtained multiplex transmission data Sg including the encrypted bit stream SB and reproduces an image signal corresponding to each scene constituting a moving image. Here, the multiplex transmission data Sg is
This is sent from the data processing device 1001 of the first embodiment. The data processing apparatus 1003 extracts a packetized encryption bit stream SB from the input multiplex transmission data Sg, and performs a descrambling process on the encryption bit stream SB based on a control signal. It has a descrambling unit 71 for generating a decompressed bit stream DB, and a separating unit 73 for separating scene description data and compressed object data corresponding to each object from the packetized decompressed bit stream DB.

Further, the data processing device 1003 is provided corresponding to each of the objects, a plurality of object decompression means for decompressing the corresponding compressed object data based on the control signal, and the data decompression device 1003 is separated from the decompressed bit stream. And a scene description reproducing means 70 for receiving the scene description data and outputting synthetic information Csd such as a scene descriptor and an object descriptor necessary for synthesizing the scene. Here, the data processing device 1003 corresponds to the data transmitting device 1001 and, as an object decompression means, compressed object data EDo1 to EDo6 corresponding to the first to sixth objects 21 to 26 (see FIG. 2).
First to sixth object decompression means 741 and 74 for decompressing and outputting decompressed object data RDo1 to RDo6
, 746. In FIG. 7, the object (1) decompression means 741 is the first object decompression means, the object (2) decompression means 742 is the second object decompression means, and the object (6) decompression means 746 is the sixth object decompression means. It is.

In the MPEG encoding method, except for a specific frame, difference image data between the previous frame image data and the current frame image data is encoded and transmitted as image data corresponding to the current frame. Therefore, in the process of generating decompressed object data, it is necessary to store the restored image data of the previous frame. Therefore, the data processing device 1003 includes six reference memories corresponding to the object decompression means 741, 742,.
, 756.

Further, the data processing device 1003 combines the decompressed object data EDo1 to EDo6 based on the combining information Csd obtained from the scene description data Dsd, and restores a restored image signal RD corresponding to the scene. A synthesizing unit 78 and a display control unit 7 which receives the restored image signal RD and outputs an image display signal Ds for displaying the scene to a monitor (not shown) based on the control signal.
9 and the descrambling means 71,
746, the scene description reproducing means 70, and the CPU 72 for controlling the display control means. Here, the receiving side copyright protection device 3 is constituted by the descrambling means 71 and the CPU 72. The data processing device 1003
Has a key storage unit (not shown) for storing the master key KMm unique to the device, which is distributed in advance by an IC card or the like.

Next, the operation will be described. FIG. 8 is a flowchart for explaining the operation of the copyright protection device 3, and shows a process in which the input transmission data Sg is descrambled by the descrambler 71 under the control of the CPU 72. Here, the processing flow of the CPU 72 constituting the copyright protection device 3 is substantially opposite to the processing flow of the CPU 18b in the first embodiment.

Data processing apparatus 100 of the first embodiment
When the transmission data Sg output from No. 1 is input to the copyright protection device 3 of the receiving-side data processing method 1003 according to the third embodiment, the descrambler 71 converts the multiplex transmission data Sg into a packet. The encrypted bit stream SB, the ECM packet, and the EMM packet are extracted, and the encrypted bit stream SB is descrambled based on a control signal from the CPU 72.

That is, first, when the EMM packet is inputted from the descrambling means 71 to the CPU 72, the CPU 72 converts the EMM packet into the encrypted work key K.
Wm is extracted, and the encrypted work key KWm is subjected to encryption / decryption processing using the previously distributed master key KMm, to generate a work key KW (step 80).
1). Next, when the ECM packet is input from the descrambling means 71 to the CPU 72, the CPU 72 extracts the encryption scramble key Ks (0) m from the ECM packet, and hand,
The encryption / decryption process using the work key KW is performed to restore the scramble key Ks (0) (step 802).

Subsequently, the descrambling means 71 performs a decryption process on the scene description data in the encrypted bit stream using the scramble key Ks (0) from the CPU 72 (step 803). further,
In the CPU 72, an encrypted scramble key Ks (1) m is extracted from the scene description data Dsd, and the scramble key Ks (0) is extracted for the encrypted scramble key Ks (1) m.
And the scramble key Ks (1)
Is restored (step 804).

Thereafter, in steps 805 to 817, the corresponding encrypted objects are protected in the order of the object number (n ') represented by the object descriptor, from among the protected objects to be protected. Extraction processing of the scramble key Ks (n ') m, encryption / decryption processing for the encrypted scramble key Ks (n') m, and compression object data E stored in the data packet P '(k) on'
The descrambling process for Don 'is repeatedly performed. Here, the data packet P ′ (k) on ′ is n ′
The k-th data packet storing the compressed object data EDon ′ corresponding to the th protected object is shown. Here, since the four objects to be protected by the copyright are the objects 21, 23, 24, and 25, the number n ′ is a value of 1 to 4.
Hereinafter, the processing of steps 805 to 817 will be described in detail.

First, the same count values n and n 'as those in the first embodiment are set to 1 (step 805). Then, when packet data (data stored in each data packet) is input to the descrambler 71 (step 806), the CPU 7
In step 2, it is determined whether the input packet data corresponds to a new object (step 807).

If the input packet data does not correspond to a new object, it is determined whether or not the input packet data corresponds to an object that is subject to copyright protection. (Step 808). If the packet data corresponds to the object (n) subject to copyright protection, the descrambling means 71 applies the CP data to the encrypted compressed object data.
An encryption / decryption process is performed using the scramble key Ks (n ') from U72, and the compressed object data is restored.
Thereafter, the CPU 72 determines whether or not the processing by the copyright protection device 3 for all packet data is completed by the copyright protection device 3 (step 817).

If the result of determination in step 808 is that the packet data does not correspond to the object to be protected, step 81
It is determined in step 7 that the processing is completed for all data. If the result of determination in step 807 is that the packet data corresponds to a new object, the CPU 72 further determines that the input packet data corresponds to a protected object that is subject to copyright protection. Is determined (step 81).
0). As a result of this determination, if the packet data corresponds to the protected object, the CPU 72
An encryption scramble key Ks (n '+ 1) m is extracted from the header of the data packet corresponding to the object (n), and the encryption scramble key Ks (n' + 1) m is used as the scramble key Ks.
It is decrypted by (n ') (step 811).

Next, the scramble key Ks (n '+ 1) obtained by encryption / decryption is transmitted from the CPU 72 to the descrambling means 7.
1 (step 812). Then, the descrambling means 71 performs an encryption / decryption process using the scramble key Ks (n ') on the encrypted compressed object data stored in the data packet corresponding to the object (n), and the compressed object data is converted. Restored
(Step 813). Thereafter, the CPU 72 increments the count values n and n 'by one (step 81).
4), the data end determination is performed (step 81)
7).

On the other hand, as a result of the determination in step 810, if the input packet data does not correspond to the protected object, the CPU 72 immediately increments the count value n by one (step 81).
5), the data end determination is performed (step 81)
7). Then, as a result of the end determination in the step 817, if the processing on all the objects in the receiving-side copyright protection device 3 has not been completed, the CPU 72
It is determined whether or not the scramble key Ks (n ') has been updated with the passage of time (step 816).
If the scramble key Ks (n ') has been updated,
Steps 802 to 81 in the receiving-side copyright protection device 3
7 is performed again, and if the scramble key Ks (n ') is not updated, the processes of steps 806 to 817 are performed again.

After that, the de-scrambled bit stream (restored bit stream) DB is subjected to data separation processing by the separation means 73. Thus, the scene description data Dsd is extracted from the data packet corresponding to the scene description, and the compressed object data corresponding to each object is extracted from the data packet corresponding to each object.

Then, the compressed object data EDo1, EDo2,..., EDo6 corresponding to each object are
Decompression means 741, 742,... Of the corresponding object
, 746, the data that can be displayed after being subjected to the decompression processing (decompressed object data RD01, RD02,.
D06). In the scene description reproducing means 70, based on the scene description data Dsd, decompressed object data RD01, R
.., RD06 are generated.

Further, each of the above-mentioned object decompression means 74
The decompressed object data output from 1, 742,... 746 is synthesized by the synthesizing means 78 based on the synthesizing information Csd based on the scene description data Dsd, and corresponds to a scene (frame image). Restored image signal R
D is generated. Then, the display means 79 performs image display corresponding to the scene based on the restored image signal RD.

As described above, in the third embodiment, compressed object data corresponding to a plurality of objects constituting a scene and scene description data describing how the plurality of objects constitute the scene are selected. Depending on whether or not the scene description data and each object data have been subjected to encryption processing on the encrypted data obtained by performing the encryption, the decryption processing on the encrypted data and the Since the reproduction process including the display of the object data is performed, the object data corresponding to the object is sequentially scrambled, and the header portion of the data packet storing the object data to be scrambled first is added to the header portion of the data packet. The scramble key used for scrambling the object data of Decryption processing can be performed for the bit stream obtained by entering. Thus, the image signal RD corresponding to the scene can be reproduced and displayed based on the transmission data Sg including the encrypted bit stream output from the data processing device of the first embodiment.

In the third embodiment, the case where the image data (object data) corresponding to each object included in the encrypted bit stream is compressed data has been described. The data may be uncompressed data. In this case, the object decompression means and the reference memory corresponding to each object shown in FIG. 7 are not required, and the configuration of the receiving-side data processing device can be simplified.

In the third embodiment, the display means 79 displays the image signal RD output from the synthesizing means 78 as it is.
9 may be configured to be controlled by the CPU 72 so as to display an image of the output of the synthesizing means 78 only when certain conditions are satisfied. For example, certain conditions for displaying the image of the output of the synthesizing unit 78 as images include that scramble processing has been performed on the image data of all protected objects constituting the scene to be displayed (encryption / decryption conditions), the scene configuration That the object data decompression processing for all the objects necessary for the object has been completed (decompression condition), or the compositing means 78 has completed the compositing of the object data corresponding to all the objects required for displaying the scene. That you have (synthesis conditions)
PU72 confirms. Here, certain conditions for displaying the output of the synthesizing means 78 as an image include:
All of the above-mentioned encryption / decryption conditions, decompression conditions, and synthesis conditions may be set, or one or only two of them may be set.

(Modification 1 of Embodiment 3) Hereinafter, as a data processing device according to Modification 1 of Embodiment 3, the output of the synthesizing means 78 is displayed as an image when the encryption / decryption condition is satisfied. The data processing device will be described. FIG. 13 is a diagram for explaining an operation of the data processing device according to the first modification of the third embodiment, and shows a flow of a descrambling process in the data processing device.

In the descrambling process in this data processing apparatus, before the step 817 in the descrambling process of the third embodiment, the CPU 72 determines the condition of the display restriction, step 820a, and the CPU 72 instructs the display restriction, step 820b. And Other descrambling processes are exactly the same as those by the copyright protection device 3 in the third embodiment.

Specifically, Modification 1 of Embodiment 3
Then, before the CPU 72 determines whether or not the processing on the compressed object data of all objects by the receiving-side copyright protection device 3 has been completed (step 817), the CPU 72 first sets all protected objects. It is determined whether the encrypted and compressed object data of the object has been decrypted (step S820).
a). If the result of this determination is that encryption / decryption of the encrypted compressed object data has not been completed for all protected objects, the CPU 72 returns the display means 7
9 is notified of a display restriction command (step 82).
0b). As a result, in the display means 79, the reproduction operation of the image signal corresponding to the scene including the protected object is prohibited. On the other hand, if the result of the determination is that the decryption of the encrypted compressed object data has been completed for all the protected objects, the CPU 72 does not notify the display means 79 of the display restriction command and the processing in step 817 is not performed. The end determination is made by the CPU 72.

Other conditions for displaying an image of the output of the synthesizing means 78 as described above may be as follows. For example, in the receiving data processing device,
When it is detected that all the encrypted object data corresponding to the protected object to be protected by the copyright protection can be read from the recording medium or can be received via the transmission medium, Playback processing is performed on the object data.

Further, in the state where the scene description data has been read out or received by the receiving side data processing apparatus, all the encrypted object data corresponding to the protected object to be protected by the copyright protection is stored. When it is detected that the object data can be read from the recording medium or can be received via the transmission medium, reproduction processing is performed on all object data.

Further, in the above-mentioned receiving side data processing device,
In a state where the scene description data is read or received, it is determined that all the object data corresponding to all the objects constituting the scene can be read from the recording medium or can be received via the transmission medium. When detected, a reproduction process is performed on all object data.

Further, when the scene data and all the object data constituting the scene are read out from the recording medium or received from the transmission medium, all the data constituting the scene are received by the receiving side data processing device. Playback processing is performed on the object data.

By reproducing and displaying a scene under such conditions, that is, by displaying only image signals corresponding to a synthesized scene on the display unit (display monitor) by the display means 79, It becomes difficult to extract the image data corresponding to the protected object to be protected from the display means, and the protection of the copyright in the data transmission / reception system is strengthened. The above conditions are detected by the CPU 72 inquiring of the recording medium or the server on the transmitting side whether or not each object data or scene description data exists.

(Modification 2 of Embodiment 3) Hereinafter, a data processing device according to Modification 2 of Embodiment 3 of the present invention will be described. FIG. 12 is a block diagram illustrating a data processing device according to a second modification of the third embodiment.
This data processing device 1003a is different from the data processing device 1003 of the third embodiment in that the transmission data S including the encrypted bit stream SB is used instead of the receiving-side copyright protection device 3.
g, a descrambler 71 for outputting a decoded bitstream DB by performing a descrambling process, and a display 7 based on display timing information Tsd included in scene description data constituting the decoded bitstream DB.
9 is provided with a receiving-side copyright protection device 3a including a CPU 72a for controlling the CPU 9a. This data processing device 10
Other configurations of 03a are exactly the same as those of the data processing device 1003 of the third embodiment.

That is, the CPU 72a constituting the copyright protection device 3a of the data processing device 1003a outputs from the descrambling means 71 in addition to the processing of the CPU 72 in the copyright protection device 3 of the third embodiment. Timing detecting means for receiving a decoded bit stream DB and detecting display timing information Tsd for independently displaying a protected object to be copyright-protected based on scene description data constituting the bit stream DB (shown in FIG. Z). And this CPU7
2a is configured to control the display means 79 based on the display timing information Tsd such that reproduction display of only the object data corresponding to the protected object is prohibited.

Next, the operation and effect will be briefly described. For example, as described above, in a configuration in which the image signal RD output from the synthesizing unit 78 is directly input to the display unit 79, and an image is displayed based on the image signal by the display unit 79, the synthesizing unit 78 outputs When the image signal RD corresponding to the scene including one object is output, one object is displayed alone. For this reason, even if the bit stream corresponding to a moving image including a plurality of objects included in the transmission data Sg is a scrambled encrypted bit stream, only one object is displayed as a moving image at the timing. By copying the image display signal supplied to the display unit (monitor) by the display means, there is a danger that the object data of the protected object that is subject to copyright protection will be illegally used.

On the other hand, a second modification of the third embodiment
In the data processing device 1003a, the copyright protection device 3a
Display timing information Tsd in which the protected object to be copyright protected is displayed alone based on the scene description data constituting the restored bit stream DB output from the descrambling means 71 by the CPU 72a.
Is detected. The display means 79 is provided by the CPU 7
2a, based on the display timing information Tsd, so that at the timing when only one protected object is displayed as a moving image, supply of the image display signal to the display unit (monitor) in the display means 79 is prohibited or Limited. As a result, it becomes difficult for the display means 79 to normally copy the image display signal of the scene consisting of only the protected object supplied to the display unit (monitor), and the protected object protected by the copyright is protected. Illegal use of the object data can be prevented.

Further, according to the third embodiment, an encryption bit stream obtained by performing scrambling on a stream portion corresponding to each object with respect to a multiplex bit stream including image data corresponding to a plurality of objects is received. In the above, the data receiving side apparatus for descrambling the encrypted bit stream and reproducing the image data corresponding to each object has been described. However, as in the third embodiment, the encoding method conforming to the MPEG4 is adopted. The data receiving side device may perform the scrambling process and the descrambling process even when accessing the reference memory that stores the restored data at the time of the decompression process of the compressed data. In this case as well, the protection of the object to be protected by the copyright can be strengthened.

In other words, in a data transmission system using an ordinary MPEG-compatible encoding method, most of the image data is converted as compressed image data obtained by compressing difference image data between the current frame and the previous frame. In order to transmit the compressed image data, it is necessary to store the restored image data of the previous frame at the time of expanding the compressed image data. For this reason, the image data restored by each object decompression means is stored in the corresponding reference memory.

In a data receiving device in which the reference memory is configured by hardware, it is difficult to copy the contents of the reference memory because the device is remodeled. However, the data receiving device in which the reference memory is configured by software is difficult. In the device, for example, object data, that is, image data corresponding to each object, is written out to a storage device on a computer. Therefore, it is possible to extract the contents of the reference memory by creating a special program. . Therefore, a data processing device that solves such a problem will be described as a third modification of the third embodiment.

(Modification 3 of Embodiment 3) A data processing device according to Modification 3 of Embodiment 3 uses the object decompression means of the data processing device 1003 of Embodiment 3 to encrypt object data. The configuration is such that encryption / decryption processing is performed on the object data written in the reference memory and read out from the reference memory.
It is the same as 03.

FIG. 7B shows a specific configuration of the object decompression means 741 which performs scramble processing and descrambling processing even when accessing data in the reference memory. The object decompression means 741
A decompression processing unit 74a that performs decompression processing on compressed object data corresponding to an object output from the separation unit 73, and subjects the decompressed object data to scramble processing and outputs it to a reference memory. A descrambling unit 74b for performing descrambling processing on the data read from the reference memory and returning the data to the decompression processing unit 74a.
c.

FIG. 7B shows only the object corresponding to the object (1) decompression means 741 in the third embodiment, but other object decompression means 742,
, 726 have the same configuration as that shown in FIG.

Modification 3 of Embodiment 3 with Such a Configuration
In the above, the object decompression means is configured to encrypt the object data, write the object data into the reference memory, and perform the decryption processing on the object data read from the reference memory. Even if the image data corresponding to each object is written to a storage device on a computer by a special program, it is impossible to reproduce the object because the contents of the reference memory (object data) are encrypted. .

Further, the method of performing the scrambling process at the time of accessing the reference memory of the object data is not limited to the method of performing the scrambling process for each object data in units of the reference memory. Alternatively, when image signals corresponding to scenes are temporarily stored in a memory, they may be collectively performed.

The scrambling method is the same as the scrambling method used in transmitting or recording a bit stream in the first embodiment.
Alternatively, a more simplified version of this scrambling process, that is, a method of using the scrambling key used for the scrambling process of each object data as it is for the encryption process at the time of memory access, or the scrambling key Ks (0 ), Various methods can be used depending on the necessity of the copyright protection strength or the ease of copying the contents of the reference memory in the system.

Further, in Embodiments 1 to 3 described above,
Although the number of objects has been described as six, the number of objects is not limited. Also, as the multiplexing processing, the object data and the scene description data are packetized and output as one multiplexed bit stream. However, the multiplexing processing is not limited to this, and the multiplexing processing is transmitted in packet units like the Internet. However, the same effect can be obtained by treating the same as packet data in one multiplexed bit stream.

Further, in each of the above embodiments, the scramble processing method has been described by taking the same method as the conventional example as an example, but the present invention is not limited to this. For example, it is possible to realize copyright protection for each object, such as one that uses stronger encryption than the scramble processing method described in the above embodiment, or a method that uses a common secret key encryption method or a public key. Any scrambling process that can achieve the object of the present invention can be applied to the encryption process (scramble process) of the present invention.

Further, in each of the above embodiments, the scrambling process using the scramble key is shown as the encrypting process.
k) may be inserted into the preset compressed object data (content) of the specific object at the time of data transmission or compression. By detecting the digital watermark data at the time of data reception or decompression, it is possible to determine whether or not the content into which such digital watermark data is inserted is copyright protected. Therefore, when the data receiving apparatus determines that the content is copyright-protected based on the digital watermark data, the data receiving side apparatus does not reproduce the content. Similarly, copyright protection can be implemented for each object. Here, the digital watermark data is a number indicated by a copyright holder of the content, a flag having an array of “1” or “0” indicating that the content is prohibited from being copied, and the like.

In each of the above embodiments, MPEG4
However, the encoding method in the data transmission system is not limited to this. If the scene is composed of a plurality of objects and the system transmits data for each object, , Data compression method is MPEG1, MPEG, JPE
G, H. 261, H .; For example, the method of performing the scrambling process for each object according to the present invention can be applied to a data transmission system that does not perform data compression.

In each of the above embodiments, the data processing device includes a copyright protection device that performs scramble or descramble processing on the bit stream independently of the data compression means or the data decompression means. However, the data processing device is not limited to this. For example, the object compression means in the data processing device on the transmission side may be configured to perform the scrambling process simultaneously with the compression of the object data. Specifically, a normal decompression process such as performing a scrambling process on the motion vector data, performing a scrambling process on a part of the DCT coefficient, or inverting a part of the compressed object data according to a certain rule is performed. If the compressed data that cannot be restored is generated and the compressed object data corresponding to all the protected objects that are subject to copyright protection is not available at the data receiving side, the compressed data is decompressed. If a mechanism that cannot be restored by the above-described method is used, the same effects as those of the above embodiments can be obtained. Further, by recording a data processing program for realizing the data processing method described in each of the above embodiments on a data storage medium such as a floppy disk, the processing described in each of the above embodiments can be performed. It can be easily implemented in an independent computer system.

FIG. 11 is a diagram for explaining a case where the data processing of the first to third embodiments is executed by a computer system using a floppy disk storing the data processing program. FIG. 11 (a)
Fig. 11 (b) shows the appearance, cross-sectional structure and floppy disk body viewed from the front of the floppy disk.
Shows an example of the physical format of the floppy disk body.

The above-mentioned floppy disk FD is composed of the above-mentioned floppy disk main body D and a floppy disk case FC.
A plurality of tracks Tr are formed concentrically from the outer circumference toward the inner circumference on the surface of the floppy disk main body D, and each track Tr has 16 sectors Se in the angular direction. Is divided into Therefore,
In the floppy disk FD storing the program, the floppy disk main body D has data as the program recorded in an area (sector) Se allocated thereon.

FIG. 11C shows a configuration for recording the above program on the floppy disk FD and performing data processing using the program stored in the floppy disk FD.

The above program is stored on a floppy disk FD
, The data as the program is written from the computer system Cs to the floppy disk FD via the floppy disk drive FDD.
In addition, the data processing device is connected to the computer system C by a program recorded on the floppy disk FD.
To build during s, use the floppy disk drive F
The program is read from the floppy disk FD by DD and loaded into the computer system Cs.

Further, the multiplex transmission data Sg including the encryption bit stream output from the data processing device of the first embodiment may be stored in the storage medium. In this case, it is possible to obtain a recording medium in which copyright protection for a recorded image signal is applied to each object constituting a scene.

In the above description, the description has been made using a floppy disk as a data recording medium.
Even when an optical disk such as a ROM or a DVD-ROM is used, data processing by software can be performed as in the case of the floppy disk. Further, the recording medium is not limited to the above-mentioned optical disk or floppy disk,
An IC card, a ROM cassette, or the like may be used as long as it can record a program. Even when these recording media are used, data processing by software can be performed in the same manner as when using the above-mentioned floppy disk or the like.

[0170]

As described above, according to the data processing method according to the present invention (claim 1), object data corresponding to a predetermined specific object among a plurality of objects constituting a scene is obtained. Since the object data and the scene description data are recorded or transmitted after performing the encryption processing, the object data is selectively subjected to the encryption processing, for example, to a specific object to be protected by copyright. Can be.

According to the present invention (claim 2), claim 1
In the data processing method described above, an encryption identifier indicating whether encryption processing has been performed on object data corresponding to any of the plurality of objects is included in the scene description data and recorded or transmitted. Therefore, the data reading side or the data receiving side can determine whether or not encryption / decryption processing is necessary before actually receiving each object data, thereby simplifying and speeding up the object data reproduction processing. Can be planned.

According to the present invention (Claim 3), Claim 1
In the data processing method described above, information necessary for the encryption processing is recorded or transmitted in the scene description data, so that information necessary for the encryption processing together with the encrypted object data, for example, an encryption key Is transmitted to the data receiving side, so that the data receiving side does not need to hold an encryption key or the like in advance. For example, even if the encryption processing on the data recording or transmission side uses a high encryption strength using a large number of encryption keys, the number of encryption keys held on the data reading side or the data reception side does not increase. There is no effect.

According to the present invention (claim 4), claim 1
In the described data processing method, without encrypting the scene description data, encrypting only the object data corresponding to the specific object, and recording or transmitting these data, On the data recording side or the transmission side, encryption processing is efficiently performed only on object data corresponding to a specific object to be protected by copyright, etc., thereby simplifying and speeding up the encryption processing. Can be.

According to the present invention (claim 5), claim 1
In the described data processing method, in the encryption processing of a plurality of object data in which a plurality of objects are protected objects, information necessary for the encryption processing corresponds to each of the plurality of object data.
Since a plurality of different types of information are used, it becomes difficult to decrypt the encrypted object data, and as a result, the protection of each protected object by encryption can be enhanced.

According to the present invention (Claim 6), Claim 1
In the data processing method described above, at the time of the encryption processing,
As the type of information required for the encryption process changes over time, it becomes difficult to decrypt the encrypted object data, and as a result, the protection of the protected object by encryption is enhanced. it can.

According to the data processing method of the present invention (claim 7), control information (encryption key) corresponding to the target object to be encrypted is already stored in the object data before the target object. Is encrypted by the control information (encryption key) corresponding to the encrypted object, and added to the object data corresponding to the encrypted object, so that the object corresponding to one protected object is encrypted. To reproduce the data, the object data sent before the data of the protected object is required. This
It becomes more difficult to decrypt the object encrypted object data, and as a result, the protection of each protected object by encryption can be greatly enhanced.

According to the data processing method of the present invention (claim 8), the first control information (encryption key) for encrypting the compressed object data corresponding to the specific object is transmitted to the second control information. (Encryption key)
The encrypted first control information is divided into a plurality of pieces of partial information so as to correspond to the number of specific objects, and each piece of partial information is added to the corresponding object data of each specific object. If the data packet corresponding to the protected object is not extracted, the scramble key Ksb
Can not play. That is, even if only the object data corresponding to a certain protected object is extracted from the encrypted bit stream, the object data of the protected object cannot be reproduced, and it is extremely difficult to illegally copy each protected object. Can provide strong defense.

According to the data processing apparatus of the present invention (claim 9), a plurality of data compression means provided corresponding to each of a plurality of objects constituting a scene and performing compression processing of each object data are provided. Multiplexing means for multiplexing scene description data and compressed object data output from each data compression means as an individual stream to output a multiplexed bit stream, and a multiplexing bit stream corresponding to a predetermined specific object. Encryption means for performing an encryption process for encrypting the individual stream to generate an encrypted bit stream, and outputting the encrypted bit stream to a data recording medium or a data transmission medium. Processing is performed on, for example, a specific object subject to copyright protection. It is possible to selectively apply for.

According to the data processing method of the present invention (claim 10), how the plurality of object data corresponding to each of the plurality of objects constituting the scene and the plurality of objects constitute the scene. Whether the above scene description data and each object data have been subjected to encryption processing to the encrypted data obtained by performing selective encryption processing on the scene description data describing Depending on the data, the decryption process for the encrypted data and the reproduction process including the display of each object data are performed, so that the data reading side or the receiving side can selectively perform the encrypted object data or the scene description data. Subject to the various encryption and decryption processes,
The reproduction process for the encrypted data can be performed efficiently.

According to the data processing device of the present invention (claim 11), how the plurality of object data corresponding to each of the plurality of objects constituting the scene and the plurality of objects constitute the scene. A device that reads encrypted data obtained by performing selective encryption processing on scene description data that describes the scene description data from a recording medium or receives the data via a transmission medium and reproduces the encrypted data. Encryption / decryption means for performing selective encryption / decryption processing on the encrypted data to generate decrypted data;
Display means for displaying the scene with the decrypted data; and encryption / decryption processing for the encrypted data and each object according to whether or not the scene description data and each object data have been subjected to encryption processing. A control unit for controlling the encryption / decryption unit and the display unit so that a reproduction process including a display of data is performed.
By selectively performing encryption / decryption processing on the encrypted object data or scene description data, it is possible to efficiently perform the reproduction processing on the encrypted data.

According to the data storage medium of the present invention (claim 12), the data processing program is used by a computer to store object data corresponding to a predetermined specific object among a plurality of objects constituting a scene. Since the process of encrypting and then the process of recording or transmitting the above-described object data and scene description data are performed, for example, of a plurality of objects, for example, selective access to a specific object to be protected by copyright is performed. Various encryption processes can be realized by software.

According to the data storage medium of the present invention (claim 13), the recorded digital data is converted into a plurality of object data corresponding to a plurality of objects constituting a scene and the plurality of objects The configuration includes scene description data describing how the scene is configured, and encryption processing is performed on object data corresponding to a predetermined specific object. By selectively encrypting and decrypting the object data or the scene description data, the reproducing process on the encrypted data can be efficiently performed.

According to the data processing method of the present invention (claim 14), how the plurality of object data corresponding to each of the plurality of objects constituting the scene and the plurality of objects constitute the scene. When the encrypted data obtained by performing a predetermined encryption process on the scene description data describing the above is read out from the recording medium or received and reproduced through the transmission medium, the predetermined specific object is Only when a reproducible state in which the corresponding encrypted object data can be reproduced is detected, all of the above, including decryption of the encrypted object data corresponding to the specific object and display of the object data. Since the playback processing is performed for the object data of Mamoru strength can be increased, it can be difficult to unauthorized use of such unauthorized copy of the object requiring copyright protection.

According to the data processing method of the present invention (claim 15), object data corresponding to each of a plurality of objects constituting a scene is compressed, and the compressed object data and the plurality of objects are compressed. Reads from a recording medium or receives and reproduces encrypted data obtained by performing predetermined encryption processing on scene description data describing how the above-described scene is configured. Only when a reproducible state in which encrypted object data corresponding to a predetermined specific object can be reproduced is detected, encryption / decryption of the object data corresponding to the specific object and the object data are performed. All the above object data, including decompression and display of Since the reproduction processing for, it is possible to enhance the protection strength for a particular object, it can be difficult unauthorized use of such illegal copying of an object requiring copyright protection.

According to the present invention (claim 16), in the data processing method according to claim 15, all of the encrypted object data corresponding to the specific object can be read from the recording medium in the reproducible state. Or a state in which the object data can be received via the transmission medium. Therefore, only when the object data recording medium or the transmitting side has the object data corresponding to all the protected objects, the reproduction processing for the specific object is performed. Will be performed. For this reason, it is possible to effectively prevent unauthorized use of the protected object to be protected, such as unauthorized copying.

According to the present invention (claim 17), in the data processing method according to claim 15, the reproducible state is a state in which the scene description data is read from the recording medium or received via a transmission medium. Since all the encrypted object data corresponding to the specific object can be read from the recording medium or can be received via the transmission medium, the object data recording medium or Reproduction processing for a specific object is performed only when object data corresponding to all protected objects is available on the transmission side and scene description data is read or received. Therefore, it is possible to more effectively prevent unauthorized use of the protected object to be protected, such as illegal copying.

According to the present invention (claim 18), in the data processing method according to claim 15, the reproducible state is a state in which the scene description data is read from the recording medium or received via a transmission medium. Since all the object data including the encrypted object data can be read from the recording medium or can be received via the transmission medium, the object data recording medium or transmission Only when the object data corresponding to all the objects constituting the scene are prepared and the scene description data is read or received, the reproduction processing for the specific object is performed. Therefore, it is possible to more effectively prevent unauthorized use of the protected object to be protected, such as illegal copying.

According to the present invention (claim 19), in the data processing method according to claim 15, the reproducible state is read from the recording medium by reading the scene description data and all object data constituting the scene. Or a state in which the object is received from a transmission medium, so that the reproduction processing of a specific object alone among a plurality of objects constituting the scene is restricted, and illegal copying of a protected object to be protected by copyright is performed. Can be almost completely prevented.

According to the data processing method of the present invention (claim 20), a plurality of object data corresponding to each of a plurality of objects constituting a scene are compressed, and the plurality of compressed object data and Encrypted data obtained by performing predetermined encryption processing on scene description data describing how the plurality of objects compose the scene is read from a recording medium or transmitted via a transmission medium. When receiving and playing back, in the decompression process of decompressing all the compressed object data obtained by performing the decryption process on the encrypted data to generate the restored object data,
Write and read the restored object data corresponding to all the objects to and from the reference memory, and perform a secondary encryption process on all the restored object data when writing to the memory; and At the time of reading from the memory, a decryption process for decrypting the secondary encryption process is performed on the read restored object data. It is possible to prevent unauthorized use of the object data of the protected object, which is stored in the reference memory during the decompression processing, which is the object of the copyright protection, such as illegal copying, and to improve the protection strength of the protected object.

According to the data processing method of the present invention (claim 21), a plurality of object data corresponding to each of a plurality of objects constituting a scene are subjected to compression processing, and the plurality of compressed plurality of object data are processed. Object data and scene description data describing how the plurality of objects compose the scene are read out from a recording medium or transmitted as encrypted data obtained by performing predetermined encryption processing. At the time of receiving and reproducing via a medium, the decompression process of decompressing all the compressed object data obtained by performing the decryption process on the encrypted data to generate the decompressed object data corresponds to each object. Write the restored object data to the reference memory corresponding to each object, and Read from the corresponding reference memory, perform a secondary encryption process on the restored object data at the time of writing to the memory, and read the restored object data at the time of reading from the memory. In contrast, since the decryption process for decrypting the secondary encryption process is performed independently for each memory, the data is stored in the reference memory during the decompression process on the data reading side or the data receiving side. Unauthorized use such as illegal copying of the object data of the protected object subject to the copyright protection can be prevented for each protected object, and the protection strength for a plurality of protected objects can be selectively improved. .

According to the data processing apparatus of the present invention (claim 22), a compression process is performed on a plurality of object data corresponding to each of a plurality of objects constituting a scene, and the compressed object data is And encrypting data obtained by performing predetermined encryption processing on scene description data describing how the plurality of objects compose the scene, by reading from a recording medium or via a transmission medium. A device for receiving and reproducing the encrypted data, performing decryption processing on the encrypted data to generate decrypted data,
A plurality of data decompression means for performing decompression processing on compressed object data included in the decoded data corresponding to each of the objects to generate decompressed object data; and decompressed objects of the objects corresponding to each of the objects A plurality of memories for storing data, wherein each of the data decompression means, when outputting the decompressed object data to the corresponding memory, performs a secondary encryption process on the decompressed object data; And an encryption / decryption unit that performs an encryption / decryption process on the decompressed object data read from the memory to release the secondary encryption process.
At the data reading side or the data receiving side, illegal use such as illegal copying of the object data of the protected object to be copyright protected stored in the reference memory stored during the decompression processing is prevented for each protected object. The protection strength for a plurality of protected objects can be selectively improved.

According to the data processing method of the present invention (claim 23), how the plurality of object data corresponding to each of the plurality of objects constituting the scene and the plurality of objects constitute the scene. Encrypted data obtained by performing a predetermined encryption process on scene description data describing the above is read from a recording medium or received via a transmission medium, and encrypted data including a display of image data. When playing back an image, the display of only the image data corresponding to the specific object set in advance is restricted, so that unauthorized use of the protected object, which is subject to copyright protection, such as illegal copying is made difficult. Can be.

According to the data processing method of the present invention (claim 24), compression processing is performed on a plurality of object data corresponding to a plurality of objects constituting a scene, and the compressed object data is , And scene description data describing how the plurality of objects compose the scene,
When the encrypted data obtained by performing the predetermined encryption processing is read out from the recording medium or received via the transmission medium, and the encrypted data including the display of the image data is reproduced, a predetermined identification is performed. Since the display of the image data corresponding to the protected object is performed only when the compressed object data corresponding to all the objects constituting the scene is decompressed, an unauthorized copy of the protected object which is subject to copyright protection is performed. Etc. can be made difficult.

[Brief description of the drawings]

FIG. 1 is a block diagram for explaining a data processing device according to a first embodiment of the present invention.

FIG. 2 shows M in the data processing device of the first embodiment.
FIG. 3 is a diagram for explaining the concept of an object encoding system conforming to PEG4, and shows a scene (FIG. 1A) composed of a plurality of objects and a hierarchical structure thereof (FIG. 1B).

FIG. 3 is a schematic diagram showing a multiplexed bit stream (FIG. (A)) generated by the data processing apparatus according to the first embodiment and an encrypted bit stream (FIG. (B)) subjected to scramble processing;

FIG. 4 is a diagram for explaining an example of a scene description used in the object encoding method according to the first embodiment;
7A shows the contents of the scene descriptor SD, FIG. 7B shows the contents of the object descriptor (1), and FIG. 7C shows the contents of the object descriptor (2).

FIG. 5 shows C in the data processing device according to the first embodiment.
It is a figure which shows the flow of the scramble process by PU.

FIG. 6 is a diagram showing a flow of a scrambling process by a CPU in a data processing device according to a second embodiment of the present invention.

FIG. 7 is a diagram for explaining a data processing device according to a third embodiment of the present invention. FIG. 7 (a) shows the configuration of the data processing device according to the third embodiment, and FIG. 15 shows a configuration of an object decompression unit in a data processing device according to a third modification of the third embodiment.

FIG. 8 shows C in the data processing device according to the third embodiment.
It is a figure which shows the flow of the descrambling process by PU.

FIG. 9 is a diagram showing a data transmission / reception system employing a conventional conditional access system.

FIG. 10 is a diagram showing a packet structure of a multiplexed bit stream output from a data transmission side device in the conventional data transmission / reception system.

FIGS. 11A and 11B are diagrams for explaining a data storage medium storing a program for performing the data processing of each of the above embodiments by a computer system, and FIG. FIG. 2 is a diagram showing the computer system.

FIG. 12 is a diagram showing a flow of a descrambling process in a data processing device according to a second modification of the third embodiment.

FIG. 13 is a diagram showing a configuration of a data processing device according to a first modification of the third embodiment.

[Explanation of symbols]

3, 3a Receiving-side copyright protection device 10 Scene description transmitting means 11 Object (1) compression means 12 Object (2) compression means 16 Object (6) compression means 17 Multiplexing means 17 Multiplexing means 18 Transmission-side copyright protection device 18a Scramble Means 18b CPU 19a Transmission medium 19b Recording medium 20 Scene 21, 23 to 25 Image object 22 Audio object 26 Character object 70 Scene description reproduction means 71 Descramble means 72, 72a CPU 73 Separation means 74a Scramble section 74b Descramble section 74c Decompression processing Unit 75 object (2) decompression means 76 object (3) decompression means 77 scene description reproduction means 78 synthesis means 79 display means 81 data transmission side device 82 audio encoder 83 video encoder Coder 84 multiplexing means 85 scrambler 91 data receiving side device 92 descrambler 93 separating means 94 audio decoder 95 video decoder 100 header 100a packet 101 adaptation field 102 payload 741 object (1) expanding means 742 object (2) expanding means 746 object ( 6) Decompression means 751, 752, 756 Reference memory 1000 Data transmission / reception system 1001, 1003, 1003a Data processing device A1 to A3 2D object Cs Computer system D Floppy disk body FC Floppy disk case FD Floppy disk FDD Floppy disk drive Se Sector Tr Track MB multiplexed bit stream SB encrypted bit stream DB decrypted bit stream Reams Ksn, Ks, Ksa, Ksb, Ks0, Ks1, Ks (n '), Ks
(n '+ 1) scramble key KW work key KWm encryption work key KMm master key Do1, Do2, Do6 object data Dau audio data Dvi video data Dsd scene description data EDo1, EDo2, EDo5 compressed object data EDau compressed audio data EDvi compression Video data RDo1, RDo2, RDo6 Decompressed object data RDau Reproduced audio data RDvi Reproduced video data OD1 to OD5 Object descriptors L1 to L3 First to third layers

Continued on the front page (51) Int.Cl. ⁷ Identification code FI Theme coat ゛ (Reference)

Claims (24)

[Claims] 1. A plurality of object data corresponding to each of a plurality of objects constituting a scene, including object data as image data or audio data, and how the plurality of objects constitute the scene. A data processing method for recording or transmitting the described scene description data, comprising: at least an encryption process for encrypting object data corresponding to a predetermined specific object among the plurality of objects; A data output process for outputting each object data and scene description data to a recording medium or a transmission medium. 2. The data processing method according to claim 1, wherein, in the data output processing, an encryption identifier indicating whether or not object data corresponding to any of the plurality of objects is encrypted, A data processing method characterized in that the data is output to a recording medium or a transmission medium while being included in the scene description data. 3. The data processing method according to claim 1, wherein, in the data output processing, control information necessary for the encryption processing is included in the scene description data and output to a recording medium or a transmission medium. Data processing method. 4. The data processing method according to claim 1, wherein in the encryption processing, only the object data corresponding to the specific object among the scene description data and the plurality of object data is encrypted. Data processing method to be used. 5. The data processing method according to claim 1, wherein in the encrypting process, object data corresponding to a plurality of specific objects is encrypted, and at this time, control information necessary for encrypting each object data includes: A data processing method characterized by using a plurality of different types of control information corresponding to each of the plurality of specific objects. 6. The data processing method according to claim 1, wherein in the encryption processing, the type of control information required for the encryption processing is changed as time elapses after the encryption of the object data is started. A data processing method comprising: 7. A plurality of object data corresponding to each of a plurality of objects constituting a scene, including object data as image data or audio data, and how the plurality of objects constitute the scene. A data processing method of recording or transmitting described scene description data, comprising: a compression process of compressing object data corresponding to each of a plurality of objects constituting the scene to output compressed object data; An encryption process of sequentially encrypting compressed object data corresponding to a predetermined specific object among the plurality of objects using control information for encryption corresponding to each specific object; Each object data and scene description data A data output process of outputting the data to a recording medium or a transmission medium. In the encryption process, the control information corresponding to the target object to be encrypted is stored in front of the target object. A data processing method comprising: encrypting data using encrypted control information corresponding to an encrypted object; and adding the encrypted control information to object data corresponding to the encrypted object. . 8. A plurality of object data corresponding to each of a plurality of objects constituting a scene, including object data as image data or audio data, and how the plurality of objects constitute the scene. A data processing method of recording or transmitting described scene description data, comprising: a compression process of compressing object data corresponding to each of a plurality of objects constituting the scene to output compressed object data; An encryption process for sequentially encrypting compressed object data corresponding to a predetermined specific object among the plurality of objects using first control information for encryption; Data and scene description data on a recording medium or Includes a data output process for outputting to a transmission medium, wherein the encryption process encrypts the first control information with second control information for encryption, and the encrypted A process of dividing the first control information into a plurality of pieces of partial information so as to correspond to the number of the specific objects, and a process of adding each piece of the partial information to the object data of each specific object corresponding to the pieces of partial information. A data processing method characterized by the following. 9. A plurality of object data corresponding to each of a plurality of objects constituting a scene, including object data as image data or audio data, and how the plurality of objects constitute the scene. What is claimed is: 1. A data processing device for recording or transmitting described scene description data, comprising: a plurality of data compression means provided in correspondence with each of the objects, for compressing the object data and outputting compressed object data; Multiplexing means for multiplexing the description data and each compressed object data as an individual stream to output a multiplexed bit stream; and for the multiplexed bit stream, an individual corresponding to a predetermined specific object of the plurality of objects. Encrypt stream An encryption means for performing an encryption process for generating an encrypted bit stream to generate an encrypted bit stream, and outputting the encrypted bit stream to a data recording medium or a data transmission medium. 10. A plurality of object data corresponding to each of a plurality of objects constituting a scene, including object data as image data or audio data, and how the plurality of objects constitute the scene. An encrypted bit stream obtained by subjecting the described scene description data to encryption processing for encrypting at least object data for a predetermined specific object is read from a recording medium or received via a transmission medium. A data processing method for performing reproduction by determining whether or not the scene description data and each object data have been subjected to an encryption process; On the other hand, decryption of encrypted data and each object Data processing method characterized by performing a reproduction process including display of Kutodeta. 11. A plurality of object data corresponding to each of a plurality of objects constituting a scene, including object data as image data or audio data, and how the plurality of objects constitute the scene. An encrypted bit stream obtained by subjecting the described scene description data to encryption processing for encrypting object data for a predetermined specific object is read from a recording medium or received via a transmission medium. A data processing device for performing decryption processing for decrypting the encrypted scene description data or object data on the encrypted bit stream based on a first control signal, and decoding the decrypted data. Based on the generated decryption means and the second control signal Display means for displaying the scene with the decrypted data; and receiving the encrypted bit stream, and performing encryption based on whether the scene description data and each object data have been subjected to encryption processing. Control means for controlling the encryption / decryption means and the display means by the first and second control signals so that the decryption processing on the encrypted data and the reproduction processing including the display of each object data are performed. A data processing device characterized by the above-mentioned. 12. A plurality of object data corresponding to each of a plurality of objects constituting a scene, including object data as image data or audio data, and how the plurality of objects constitute the scene. A data storage medium storing a data processing program for performing data processing on the described scene description data by a computer, wherein the data processing program corresponds to at least a predetermined specific object among the plurality of objects. A data storage medium characterized in that the computer is configured to perform a process of encrypting object data to be performed, and thereafter, a process of outputting the object data and the scene description data to a recording medium or a transmission medium. 13. A data storage medium on which digital data for reproducing a scene is recorded, wherein the digital data is image data or audio data corresponding to each of a plurality of objects constituting the scene. A plurality of object data including object data and scene description data describing how the plurality of objects compose the scene, and at least object data corresponding to a predetermined specific object are encrypted. A data storage medium obtained by performing processing. 14. A plurality of object data corresponding to each of a plurality of objects constituting a scene, including object data as image data or audio data, and how the plurality of objects constitute the scene. An encrypted bit stream obtained by subjecting the described scene description data to encryption processing for encrypting at least object data for a predetermined specific object is read from a recording medium or received via a transmission medium. A data processing method for reproducing the encrypted object data corresponding to the specific object, and detecting whether or not the encrypted object data is reproducible. Encrypted corresponding to the above specific object Including encryption decoding and display of each object data for the object data, the data processing method, which comprises carrying out the regeneration process for the all object data. 15. Compressing a plurality of object data including object data as image data or audio data corresponding to each of a plurality of objects constituting a scene to generate a plurality of compressed object data; And scene processing data describing how the plurality of objects compose the scene by performing an encryption process for encrypting at least compressed object data corresponding to a predetermined specific object. A data processing method for reading out an encrypted bit stream from a recording medium or receiving and transmitting the same via a transmission medium, wherein the encrypted compressed object data corresponding to the specific object is in a reproducible state. Whether or not the encrypted compression Only when the object data is in a reproducible state, decryption processing for the encrypted compressed object data corresponding to the specific object, and reproduction processing for all the object data, including decompression and display of each of the compressed object data A data processing method. 16. The data processing method according to claim 15, wherein in the reproducible state of the encrypted object data, all of the encrypted compressed object data corresponding to the specific object can be read from the recording medium. Or a state in which the data can be received via a transmission medium. 17. The data processing method according to claim 15, wherein the reproducible state of the encrypted object data is a state in which the scene description data is read from the recording medium or received via a transmission medium. A data processing method wherein all of the encrypted compressed object data corresponding to the specific object can be read from the recording medium or can be received via a transmission medium. 18. The data processing method according to claim 15, wherein the reproducible state of the encrypted object data is a state in which the scene description data is read from the recording medium or received via a transmission medium. Wherein all object data including the encrypted compressed object data corresponding to the specific object can be read from the recording medium or can be received via a transmission medium. Data processing method. 19. The data processing method according to claim 15, wherein the reproducible state of the encrypted object data is determined by reading out the scene description data and all the object data constituting the scene from the recording medium or A data processing method characterized by being received from a transmission medium. 20. Compressed object data is generated by compressing a plurality of object data corresponding to each of a plurality of objects constituting a scene, including object data as image data or audio data,
An encryption process for encrypting at least compressed object data corresponding to a predetermined specific object with respect to the compressed object data and scene description data describing how the plurality of objects constitute the scene. A data processing method for reading out an encrypted bit stream obtained by performing the above from a recording medium or receiving and reproducing the same via a transmission medium, wherein the encryption processing is released from the encrypted bit stream. A data generation process of performing a decryption process to generate compressed object data corresponding to the specific object, and a decompression process of decompressing all the compressed object data constituting the scene to generate restored object data; In the decompression processing, the decoding corresponding to all the objects is performed. Write and read the original object data to and from the reference memory, perform a secondary encryption process on all the restored object data when writing to the memory, and A decryption process for decrypting the secondary encryption process on the read restored object data. 21. Compressing a plurality of object data corresponding to each of a plurality of objects constituting a scene, including object data as image data or audio data, to generate compressed object data;
An encryption process for encrypting at least compressed object data corresponding to a predetermined specific object with respect to the compressed object data and scene description data describing how the plurality of objects constitute the scene. A data processing method for reading out an encrypted bit stream obtained by performing the above from a recording medium or receiving and reproducing the same via a transmission medium, wherein the encryption processing is released from the encrypted bit stream. A data generation process of performing a decryption process to generate compressed object data corresponding to the specific object, and a decompression process of decompressing all the compressed object data constituting the scene to generate restored object data; In the decompression processing, the restoration processing corresponding to each object is performed. Writes the object data to the reference memory corresponding to each object, reads the object data from the corresponding reference memory as necessary, and performs a secondary encryption process on the restored object data when writing to the memory. In addition, when reading from the memory, data processing for performing decryption processing for decrypting the secondary encryption processing on the read restored object data is performed independently for each memory. A data processing method characterized in that the data processing method is performed. 22. Compressing a plurality of object data including object data as image data or audio data corresponding to each of a plurality of objects constituting a scene to generate compressed object data;
For the compressed object data and scene description data describing how the plurality of objects compose the scene, encryption processing for encrypting at least object data corresponding to a predetermined specific object is performed. A data processing device for reading an encrypted bit stream obtained by performing the encryption bit stream from a recording medium or receiving and reproducing the same via a transmission medium, wherein the encryption processing unit decrypts the encrypted bit stream with the encryption process. Encryption / decryption means for performing decryption processing to generate decryption data; and providing decompression processing for decompressing compressed object data of the corresponding object included in the decryption data and provided for the respective objects. And a plurality of data decompression means for generating A plurality of memories provided correspondingly to each other and storing decompressed object data of the corresponding object, wherein each of the data decompression means stores the decompressed object data in the corresponding memory when outputting the decompressed object data to the corresponding memory. An encryption unit for performing a subsequent encryption process; and an encryption / decryption unit for performing an encryption / decryption process on the decompressed object data read from the memory to release the secondary encryption process. A data processing device characterized by the above-mentioned. 23. A plurality of object data including object data as image data or audio data corresponding to each of a plurality of objects constituting a scene, and how the plurality of objects constitute the scene. An encrypted bit stream obtained by subjecting the described scene description data to encryption processing for encrypting at least object data corresponding to a predetermined specific object is read from a recording medium or transmitted via a transmission medium. A data processing method for receiving and reproducing an encrypted bit stream including display of image data, extracting scene description data from the encrypted bit stream, and extracting the scene description data based on the scene description data. The corresponding object data alone Data processing method characterized by limiting the display image. 24. A plurality of object data corresponding to each of a plurality of objects constituting a scene, including object data as image data or audio data, and how the plurality of objects constitute the scene. An encrypted bit stream obtained by subjecting the described scene description data to encryption processing for encrypting at least object data corresponding to a predetermined specific object is read from a recording medium or transmitted via a transmission medium. A data processing method for playing back an encrypted bit stream including display of image data, wherein it is determined whether or not all the encrypted object data corresponding to the specific object has been decrypted, The encrypted object corresponding to the specific object Only when the object data is decryption of all, the data processing method and performs image display of the object data corresponding to the specific object.