JP3754847B2 - Data processing method, data processing apparatus and storage medium thereof - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
  The present invention relates to a data processing method, a data processing device, a data processing system, a storage medium thereof, and a computer program, and more particularly to a data processing method, a data processing device, and a storage medium for reproducing information from a plurality of object streams.
[0002]
[Prior art]
In recent years, MPEG-4 (Moving) has been developed as a technique for encoding data such as moving images and audio, treating each encoded data as an object, and combining these so-called multimedia data and transmitting it as a single bit stream. Picture Experts Group Phase 4) is being standardized. On the MPEG-4 reception side (reproduction side), for example, audio and a moving image scene are associated and reproduced. In such an MPEG-4 system, due to the characteristic that data is handled as an object, the received bit stream can be easily reorganized separately for each object. Here, when a copyright exists for each object, it is necessary to restrict the use of the entire data or a part thereof in order to protect the copyright.
[0003]
The MPEG-4 data stream as described above has a function of independently transmitting and receiving a number of video scenes and video objects on a single stream, unlike conventional general multimedia streams. Yes. Similarly, audio has a function of transmitting and receiving several objects independently on a single stream.
[0004]
There is BIFS (Binary Format For Scenes) in which VRML is corrected as information for synthesizing these objects and synthesizing a certain scene. In this BIFS, the scene is described in binary, and the scene is synthesized according to this BIFS.
[0005]
Since each individual object necessary for scene synthesis is transmitted after being optimally encoded individually, each object is also decoded individually on the decoding (receiving) side. Each object decoded in this way is synthesized and output in synchronism with the time axis of the individual data in accordance with the description of BIFS.
[0006]
In this way, since the MPGE-4 player combines a plurality of objects, if any object has a copyright, it is necessary to restrict the use of the object.
[0007]
In general, in order to protect copyright, the transmitting side performs encryption processing on the transmission data or inserts a digital watermark, and the receiving side, that is, the playback device, applies the copyright to the copyright. Only when a reasonable price is paid, information necessary for decrypting the encrypted data is obtained, the received data is decrypted, and data such as moving images and sounds can be reproduced. Has been done.
[0008]
In addition, the following methods are conceivable as copyright protection methods in MPEG-4 using digital watermarks. In this method, each object stream is separated from a data stream including a plurality of object streams each having predetermined information, and a video decoder for decoding moving image data is activated. Next, the video data is decoded by the video decoder, and the copyright information embedded as a digital watermark is extracted, and an authentication operation is performed with the data in the management stream for protecting the intellectual property. Do. As a result of this authentication work, in the case of “reproduction permission”, an operation start / continuation command is issued to the video decoder. As a result, the decoded moving image data is supplied to the scene synthesizing circuit so that the moving image data can be viewed.
[0009]
On the other hand, when the result of the authentication work is “reproduction not permitted”, an operation stop command or a data transfer stop command to the video decoder is issued to the video decoder. The video is not supplied to the scene synthesis circuit, and the moving image cannot be viewed.
[0010]
[Problems to be solved by the invention]
However, the conventional method has a problem that the copyright information embedded in the data of the object stream as a digital watermark is extracted after the data of the stream is once decrypted. This means that once decrypted, data such as images and sounds are present in the memory of the playback device without being protected by encryption or the like. Therefore, if a malicious third party is in an environment where the data stored in the memory can be copied, the decrypted data is illegally copied, which is not desirable. However, in the MPEG-4 system, no specific method has been proposed for dealing with such a situation.
[0012]
  The present invention has been made in view of the above conventional example,Protecting copyrighted object data from unauthorized playback by a third partyAn object of the present invention is to provide a data processing method and apparatus and a storage medium capable of the same.
[0013]
[Means for Solving the Problems]
  In order to achieve the above object, the data processing apparatus of the present invention comprises the following arrangement. That is,
  A data processing apparatus for separating and reproducing an object stream from a data stream including the object stream,
  Input means for inputting a data stream including at least one encrypted object stream each having predetermined information;
  Separating means for separating the object stream from the data stream input by the input means;
  Included in the data streamCopyright managementExtract informationCopyright managementInformation extraction means;
  Watermark information extracting means for extracting watermark information contained in the object stream;
  Acquisition means for acquiring ID information embedded in the data processing device or a storage medium connectable to the data processing device;
  SaidCopyright managementinformationAnd the watermark information and the ID informationKey information generating means for generating key information using
  Descrambling means for descrambling the object stream separated by the separation means based on the key information;
  And decoding means for decoding the predetermined information from the object stream descrambled by the descrambling means.
[0014]
  In order to achieve the above object, the data processing method of the present invention comprises the following steps. That is,
  A data processing method for separating and reproducing an object stream from a data stream including an object stream each having predetermined information,
  Included in the data streamCopyright managementExtract information,
  Extracting watermark information contained in the object stream;
  ID information unique to the user or device receiving and playing the data stream and theCopyright managementinformationAnd the watermark informationGenerate key information using
  The object stream is controlled to be descrambled based on the key information.
[0015]
DETAILED DESCRIPTION OF THE INVENTION
Preferred embodiments of the present invention will be described below in detail with reference to the accompanying drawings.
[0016]
In the present embodiment, first, a schematic configuration of the general MPEG-4 player shown in FIG. 1 will be described, and then an example of the descrambling process of the player according to the present embodiment will be described. Furthermore, an explanation will be given with reference to a flowchart showing an example of the operation of the regenerator according to the present embodiment, and finally an example of the entire system including the transmission side apparatus will be explained.
[0017]
FIG. 1 is a block diagram showing a schematic basic configuration of an MPEG-4 player according to the present embodiment.
[0018]
In FIG. 1, a transmission path 101 is a data transmission path such as various networks and a computer bus, and in this embodiment, a network to which an MPEG-4 stream is input is shown. Further, the transmission path 101 in the present embodiment means an interface with a playback device of a storage medium such as a CD-ROM, a DVD-ROM, and a DVD-RAM in addition to the meaning of a communication path.
[0019]
In the apparatus of the present embodiment, the MPEG-4 stream distributed from the transmission path 101, that is, the network, or the MPEG-4 stream transmitted from the storage medium apparatus is input to the demultiplexer 102. Here, the MPEG-4 stream is separated into scene description data, moving image object data, audio object data, object description data, and the like, and then input and stored in the corresponding memory units 103 to 106, respectively. That is, the memory unit 103 stores scene description data, the memory 104 stores audio object data, the memory unit 105 stores moving image object data, and the memory unit 106 stores object description data.
[0020]
Here, the audio object data is, for example, data that has been subjected to high-efficiency encoding such as well-known CELP (Code Excited Linear Prediction) encoding or transform domain weighted interleaved vector quantization (TWINVQ) encoding. The image object data is, for example, data that has been subjected to high-efficiency encoding by the well-known MPEG-2 or III H-263 system.
[0021]
Each object data of the memory units 104 to 106 is input to the corresponding decoding units 107 to 110. In each of the scene description decoding unit 107, the audio decoding unit 108, the moving image decoding unit 109, and the object description decoding unit 110, the scene description data, the audio object data, and the moving image object data that have been encoded with high efficiency as described above. Each of the object description data is decrypted.
[0022]
In the present embodiment, it is assumed that the audio object, the moving image object, and the object description data can be decoded even when a plurality of different types of objects exist in the MPEG-4 stream. Assume that a plurality of memory units 104 to 106 and decoding units 108 to 110 are prepared for audio, moving images, and object description data, respectively.
[0023]
Then, the audio object, the moving image object, and the object description data decoded by the decoding units 108 to 110 are combined / graphically processed by the scene combining unit 112 based on the scene description data decoded by the scene description decoding unit 107. Is done. The final data string obtained in this way is supplied to an output device 113 such as a display or a printer device, and is visualized and output.
[0024]
Here, in the received data stream according to the present embodiment, reproduction is executed for the protection of copyrights or the like for individual object data constituting a scene such as audio or moving image, or the reproduction is stopped. If control is necessary, control is performed using IPMP information. This IPMP information is transmitted in an IPMP stream that is a component of the received data stream.
[0025]
Based on the IPMP information 120 included in the IPMP stream from the demultiplexer 102, the IPMP control unit 111 blocks the stream at the control point as necessary, or accesses the decoding units 108 to 110 to stop the decoding operation. Command.
[0026]
For this reason, when it is determined by the IPMP information 120 or the like that there is no right to view the object data, the object data is not decrypted, and therefore the reproduction is not performed. By performing such control, it is possible to prevent the occurrence of a situation in which copyrighted data is illegally viewed by a third party.
[0027]
FIG. 2 is a diagram for explaining an example of the descrambling process in the playback device according to the present embodiment. The parts common to those in FIG. 1 are denoted by the same reference numerals, and the description thereof is omitted.
[0028]
Here, the authentication information 223 is generated in the authentication information processing unit 205 using the copyright management information 221 output from the IPMP control unit 111 and the player information 222 from the storage medium I / F 206, and the descrambling control unit. 204. The descrambling control unit 204 generates key information 225 using the authentication information 223 and the watermark information 224 extracted by the watermark extraction unit 202 and outputs the key information 225 to the descrambling unit 207. In this way, the encrypted data is descrambled. This will be described in detail below.
[0029]
Here, the copyright management information 221 is information described in the IPMP information 120, and the player information 222 is pre-installed in a storage medium of the player or connected to the player. The watermark information 224 is information embedded in a possible external storage medium. The watermark information 224 is information embedded in the object data as a digital watermark.
[0030]
An MPEG-4 stream including scene description data, audio object data, moving image object data, CG object data, object description data, IPMP information, and the like is separated into each object data by the demultiplexer 102, and then audio object data, Moving image object data, CG object data, and the like are sent to the watermark extraction unit 202, IPMP information 120 to the IPMP control unit 111, and object description data to the decoding units 107 to 110, respectively. The watermark extraction unit 202 is provided for each of audio, moving image, and object description data, and includes a memory and an extraction unit. Each object data separated by the demultiplexer 102 is stored in a corresponding memory of the watermark extraction unit 202. Here, the object data having the copyright is pre-encrypted.
[0031]
This encryption is performed on the object data transmission side, and an encryption key is required for this encryption. Here, the key information 225 generated by the descrambling control unit 204 is controlled so as to be the same data as the encryption key only when descrambling with a valid user's playback device. That is, the transmission side apparatus generates watermark information, IPMP information 120, and player information 222. The watermark information is embedded in the object data, and the IPMP information 120 is embedded in the IPMP stream for transmission. Further, the player information 222 is incorporated in advance in a storage medium of the player by some method or is incorporated in an external storage medium connectable to the player.
[0032]
In the player according to the present embodiment, the key information 225 is generated using the copyright management information 221, the player information 222, and the watermark information, but an encryption key (that is, key information) is generated in the transmission side device. There are many ways to use which information to use and how to combine them. Therefore, the selection of information to be used and the combination thereof are determined by the copyright holder of the data or the service provider. Therefore, it is necessary to provide a mechanism for transmitting information on this selection and combination to the player. Here, it is assumed that information regarding the selection and combination is transmitted to the playback device by the IPMP information 120.
[0033]
In this way, the playback device of the present embodiment first analyzes the IPMP information 120. The IPMP information 120 stored in the memory of the IPMP control unit 111 is analyzed by the control unit of the IPMP control unit 111. The IPMP information 120 includes a header portion and an information portion, and the information portion further includes a flag portion and an actual data portion. Also, copyright management information 221 is described in the actual data portion. In the MPEG-4 system, the configuration of the header portion of the IPMP information 120 is specified, but the configuration of the actual data portion is not specified. Therefore, the configuration as described above conforms to the MPEG-4 system standard.
[0034]
In the header portion of the IPMP information 120, there is information indicating whether or not the object data stored in the memory of the watermark extraction unit 202 is encrypted. Specifically, when IPMP_Type in the header part of the IPMP information 120 is “1”, this indicates that the object data is encrypted. The flag portion of the information portion of the IPMP information 120 includes a watermark flag, an authentication information flag, a player information flag, and a copyright management information flag. Whether the watermark information is embedded in the object data, authentication information 223 is required when generating the key information 225, the player information 222 is required when generating the authentication information 223, or the copyright management information 221 is required when generating the authentication information 223. Or the like. Here, when the copyright management information 221 is “necessary”, the copyright management information 221 is described in the actual data portion of the IPMP information 120.
[0035]
In the present embodiment, authentication information 223 is generated using copyright management information 221 and player information 222, and key information 225 is generated using authentication information 223 and watermark information. A case where encrypted data is descrambled using H.225 will be described. Therefore, in this embodiment, in each of the above flags, the watermark embedding and authentication information 223 is set as “necessary”, the player information 222 is “necessary”, and the copyright management information 221 is set as “necessary”. Has been.
[0036]
The copyright management information 221 included in the IPMP information 120 is extracted by the control unit of the IPMP control unit 111 and sent to the authentication information processing unit 205. Also, the watermark information is extracted by the watermark extraction unit 202 from the encrypted object data in which the watermark information is embedded. Then, after the extracted watermark information is sent to the descrambling control unit 204, the object data from which the watermark information is extracted is sent to the descrambling unit 207.
[0037]
Further, the player information 222 included in the storage medium of the player and the external storage medium connected to the player is taken out by the storage medium I / F 206 and sent to the authentication information processing unit 205. The player information 222 is information unique to each player or user such as a player ID and a user ID, and is sent off-line from the transmission side device, or previously stored in a storage medium of the player, external It shall be incorporated in a storage medium. The player information 222 and the copyright management information 221 are processed in the authentication information processing unit 205 to generate authentication information 223, which is sent to the descrambling control unit 204. The descrambling control unit 204 generates key information 225 based on the watermark information 224 extracted by the watermark extraction unit 202 and the authentication information 223 from the authentication information processing unit 205, and sends the key information 225 to the descrambling unit 207. If the player is a legitimate user player, the key information 225 is the same data as the encryption key used for encryption on the transmission side. The descrambling process is normally performed by performing the descrambling process on the encrypted object data sent from the server.
[0038]
On the other hand, in the case of a playback device of an unauthorized user, the key information 225 generated by the descrambling control unit 204 is not the same as the encryption key used at the time of encryption in the transmission side device. Will not be descrambled.
[0039]
The data descrambled by the descrambling unit 207 is decoded by the decoding units 107 to 110, and data such as a moving image, a still image, and CG is output.
[0040]
As described above, according to the present embodiment, in the playback device of the user who is not permitted to play back the data, the object data exists in the memory or the like in an encrypted state. It is possible to protect copyrighted data from such threats.
[0041]
Furthermore, by transmitting an electronic watermark embedded in object data, transmission efficiency is improved by the amount of data embedded as a watermark. Furthermore, since important information that is the basis of key information is embedded, a good effect in terms of security can be obtained.
[0042]
In the above, the authentication information 223 is generated using the copyright management information 221 and the player information 222, the key information 225 is generated using the authentication information 223 and the watermark information 224, and the key information 225 is used. In the above description, the encrypted data is descrambled. However, the key information 225 is generated using at least one of the watermark information 224, the player information 222, and the copyright management information 221. This key information 225 may be used for descrambling. In this case, the player analyzes the contents of the header part and the information part of the IPMP information 120, acquires necessary information from the watermark information, the player information, and the copyright management information, and processes it. Finally, the key information 225 is generated and the descrambling process is performed.
[0043]
Here, regarding a method of simultaneously embedding and encrypting information in an MPEG stream and extracting the embedded information before descrambling on the playback device side, “a scrambled / digital watermarking method for compressed video” ”(21st Information Theory and its Applied Symposium).
[0044]
In general, in the MPEG system, an image is divided into 16 × 16 pixel macroblocks, and then frame prediction is performed. Further, DCT (discrete cosine transform) is performed for each 8 × 8 pixel block to calculate DCT coefficients. . These DCT coefficients are zigzag scanned after conversion, and are expressed as variable-length codewords with a set of runs representing zero coefficients and levels representing the coefficients. In such an MPEG system, attention is paid to the fact that there are always a plurality of codewords having the same codeword length and run value, although the levels are different. First, codewords having the same codeword length and run value as the codeword Ci to be encrypted / embedded are arranged so that they are even-numbered if the level value is even and odd-numbered if odd. . Next, a random number sequence Si is generated from the encryption key, and the encryption / embedding code word Ci is replaced with the 2 (Si mod N) + Wi-th code word Ci ′ arranged in the above-described encryption. Perform embedding. Here, N is the number of codewords having the same codeword length and run value as Ci, and Wi is a value that takes “1” or “0” (“1” when information is embedded in the target codeword). “0” is selected when not embedded).
[0045]
In extracting the embedded information in this way, “1” is embedded if Ci ′ is arranged in an odd number in the above arrangement, and “0” is embedded if it is arranged in an even number. Done.
[0046]
Here, descrambling means that when Ci 'is arranged in an odd number, the code word arranged in the direction opposite to the above by 1 + 2 (Si mod N) is Ci. When Ci 'is evenly arranged, the code word arranged opposite to the above by 2 (Si mod N) is Ci.
[0047]
By adopting such a method, information embedded in the encrypted MPEG stream can be extracted before descrambling. However, the above method is not the only one, and it is possible to extract the information embedded in the encrypted MPEG stream before descrambling using another method.
[0048]
In the following, an operation in the playback device according to the embodiment of the present invention, particularly an example of descrambling control and key information generation processing will be described with reference to the flowchart of FIG.
[0049]
FIG. 3 shows that the player information 222 is generated from the player information 222 and the copyright management information 221, and the key information 225 is generated from the authentication information 223 and the watermark information 224. 10 is a flowchart for explaining a descrambling process and a key information generating process for descrambling encrypted data using key information 225; Hereinafter, a series of processing will be described by dividing it into two processing flows: generation of key information 225 and descrambling of encryption / watermark data.
[0050]
First, in step S301, when the playback device receives an MPEG-4 stream including scene description information, moving image object data, audio object data, object description data, IPMP information, etc., the demultiplexer 102 separates it into each object data. In step S302, each object data separated by the demultiplexer 102 is stored in a corresponding memory unit. Here, the IPMP information 120 is processed by the key information generation processing routine, and the video object data and audio object data in which the encryption / watermark is embedded is processed by the descrambling processing routine. The following steps S303, S305, S306, S307, and S308 are performed by a key information generation process routine, and the processes of steps S304 and S309 are performed by a descrambling process routine.
[0051]
First, the process of the key information generation process routine will be described.
[0052]
In step S303, the information described in the IPMP information 120 is analyzed to determine what operation is to be performed next. In this embodiment, authentication information 223 is generated from the player information 222 and copyright management information 221, and key information 225 is generated from the authentication information 223 and watermark information 224. Since the encrypted data is descrambled using the key information 225, the object data in the IPMP information 120 is “encryption and watermark embedding”, the authentication information 223 is “necessary”, and the player information 222 is “ Necessary ”and copyright management information 221 indicate“ necessary ”, respectively.
[0053]
Therefore, in the key information generation processing routine, first, the player information 222 is extracted in step S305, the copyright management information 221 is extracted in step S306, and authentication is performed from the player information 222 and the copyright management information 221 in step S307. Information 223 is generated, and in step S308, each process is performed in the order of generating key information 225 from the authentication information 223 and the watermark information 224. In step S303, since the watermark embedding flag of the IPMP information 120 indicates “watermark embedded”, in the key information generation processing routine, the watermark information from the object data is compared with the descrambling processing routine (S304) described later. An instruction is issued to extract 224 and input the extracted watermark information 224 to the key information generation processing routine (S308).
[0054]
Hereinafter, each step will be described. First, in step S305, the player information 222 that is incorporated in advance in the storage medium of the player or that is incorporated in the external storage medium that can be connected to the player is extracted. In step S306, copyright management information 221 described in the information part of the IPMP information 120 is extracted. In step S307, authentication information 223 is generated from the playback device information 222 extracted in step S305 and the copyright management information 221 extracted in step S306.
[0055]
In step S308, the key information generation process routine generates key information 225 from the authentication information 223 generated in step S307 and the watermark information 224 extracted by the descrambling process routine, and the key information 225 is decrypted. The data is output to the scramble processing routine (S309).
[0056]
Next, the descrambling process routine will be described.
[0057]
First, in step S304, since the watermark embedding flag of the IPMP information 120 indicates “embedding”, it is embedded in object data such as moving image object data and audio object data in accordance with a command from the key information generation processing routine (S303). Watermark information 224 is extracted. Then, the extracted watermark information 224 is input to the key information generation processing routine (S308).
[0058]
In step S309, descrambling of the encrypted data is performed using the key information 225 generated in step S308. Here, in the case of a legitimate user player, the correct key information 225 (the encryption key used when encrypting the object data on the transmission side) is generated in the key information processing routine, so that the correct descrambling is performed. However, in the case of a playback device of an unauthorized user, the incorrect key information 225 is generated and used, and therefore cannot be correctly descrambled.
[0059]
By repeating such a cycle, the encrypted object data is descrambled.If the player is not a valid user of the object data, the data is not correctly descrambled. Can't play.
[0060]
[Description of data processing system]
FIG. 4 is a diagram showing a configuration example of the entire data processing system including the regenerator according to the present embodiment described above and an encoding device that transmits encoded data to the regenerator.
[0061]
The content DB 402 stores data such as moving images, audio, and CG transmitted as MPEG-4 stream content, and each data is sent to the encoding unit 403 in response to the transmission request. The encoding unit 403 performs high-efficiency encoding according to each data sent from the content DB 402. This means CELP coding or transform domain weighted interleave vector quantization coding for audio data, and compression coding based on H-263 or DCT transformation for moving image data. The scene description information is sent to the multiplexing unit 411 immediately after being encoded. This is because the scene description information is data necessary for reproducing each object, and is not content data that may have a copyright such as a moving image or sound, and therefore it is not necessary to encrypt the data. Each data encoded by the encoding unit 403 is sent to the encryption / watermark embedding unit 404 to be encrypted, and watermark insertion is performed. In the method in which encoding, encryption, and watermark embedding are performed at the same time as described in “One Method of Scramble / Digital Watermark for Compressed Video”, the encoding unit 403 and the encryption / watermark embedding unit 404 are It consists of one part.
[0062]
The encryption / watermark embedding unit 404 performs encryption based on the key information 420 from the key information generation unit 405 for each of the encoded audio, moving image, and object description data, and the watermark information generation unit 406 The watermark information 421 is embedded in the data. This encryption is performed on the copyrighted data, and there is no need for encryption. That is, for the data having no copyright, the encryption / watermark embedding unit 404 is skipped and the multiplexing unit 411. Similarly, when it is not necessary to embed a watermark, the encryption / watermark embedding unit 404 is skipped.
[0063]
The key information generation unit 405 generates key information 420 under the control of the control unit 408. The key information 420 is data used when the encryption / watermark embedding unit 404 encrypts data, that is, an encryption key.
[0064]
The watermark information generation unit 406 generates watermark information under the control of the control unit 408. The watermark information 421 is data that is embedded in data by the encryption / watermark embedding unit 404.
[0065]
In order to make it possible to descramble, decrypt, and reproduce content data having copyrights only by a valid user's player, key information 420 used in encryption, embedded watermark information 421, IPMP information 120, and reproduction The machine information 222 needs to be correctly combined and sent to the playback device at an accurate timing. Therefore, the control unit 408 controls the key information generation unit 405, the watermark information generation unit 406, and the IPMP information generation unit 409 based on the control information from the user management unit 407, thereby generating the key information 420 and the watermark information 421. And the generation process of the IPMP information 120 are managed so that normal descrambling can be performed only when the playback device 410 is a valid user of the content.
[0066]
The player information 222 is information unique to each player or user such as a player ID and a receiver ID, for example, and is generated by the control unit 408 and incorporated in advance in a storage medium in the player 410 or an external storage medium. Or sent offline.
[0067]
The user management unit 407 has information such as what kind of content data is encoded and transmitted, and who is the contractor. Specifically, the content data includes information indicating whether the content data is copyrighted data or not. If the data is copyrighted, it includes the name of the legitimate user (contractor), the contract period, the contract form, the user ID, or the player ID. Furthermore, in order to generate the key information 225 in the playback device 410 of a legitimate user, information regarding which of watermark information, playback device information, and copyright management information is required may be provided. Based on these pieces of information, control information is sent to the control unit 408.
[0068]
The IPMP information generation unit 409 is information about which of watermark information, copyright management information, and playback device information is used and combined based on the control information from the control unit 408. Actual data of each flag information and copyright management information is generated, and IPMP information 120 is generated based on these information and sent to the multiplexing unit 411.
[0069]
For example, as described with reference to FIG. 2, “authentication information is generated using copyright management information and player information, and key information is generated using authentication information and watermark information, and encrypted data is generated. Is descrambled ”, IPMP_Type = 1 in the header part of the IPMP information 120, and in the flag part of the information part, the watermark information is“ embedded ”, the authentication information is“ necessary ”, and the player information is“ necessary ”. In the copyright management information, information indicating “necessary” is set.
[0070]
The multiplexing unit 411 multiplexes the encoded data such as moving images, audio, and CG, scene description information, and IPMP information 120 to generate an MPEG-4 stream. Thereafter, this MPEG-4 stream is sent to the playback device 410.
[0071]
By constructing an MPEG-4 data processing system with such a transmission side device 401 and a playback device 410, copyrighted object data can be played back only with a valid playback device 410, and with an unauthorized playback device. Since only encrypted data can be handled, copyright data can be protected.
[0072]
Note that the present invention can be applied to a system (for example, a copier, a facsimile machine, etc.) composed of a single device even if it is applied to a system composed of a plurality of devices (for example, a host computer, interface device, reader, printer, etc.). May be.
[0073]
Also, an object of the present invention is to supply a storage medium (or storage medium) that records a program code of software that realizes the functions of the above-described embodiments to a system or apparatus, and to perform a computer (or CPU or CPU) of the system or apparatus. (MPU) can also be achieved by reading and executing the program code stored in the storage medium. In this case, the program code itself read from the storage medium realizes the functions of the above-described embodiments, and the storage medium storing the program code constitutes the present invention. Further, by executing the program code read by the computer, not only the functions of the above-described embodiments are realized, but also an operating system (OS) running on the computer based on the instruction of the program code. A case where part or all of the actual processing is performed and the functions of the above-described embodiments are realized by the processing is also included.
[0074]
Furthermore, after the program code read from the storage medium is written in the memory of the function expansion card inserted into the computer or the function expansion unit connected to the computer, the function expansion is performed based on the instruction of the program code. This includes a case where the CPU or the like provided in the card or the function expansion unit performs part or all of the actual processing and the functions of the above-described embodiments are realized by the processing.
[0075]
As described above, according to the present embodiment, at least one of a plurality of encrypted object streams is descrambled based on the key information when descrambling the encrypted stream. Here, the key information is generated using at least one of watermark information, copyright management information, and player information. This watermark information is embedded in this object stream as a digital watermark, copyright management information is included in the stream for protecting and managing intellectual property, and player information separates, descrambles, and reproduces each object stream. Incorporated in an external storage medium that is pre-installed in a data processing apparatus storage medium or connectable to the data processing apparatus so that the copyrighted data is not encrypted and is not a legitimate user There is no risk of being present in the memory on the player. In this way, it is possible to protect copyrighted data from threats such as unauthorized copying by a third party.
[0076]
When watermark information is embedded as an electronic watermark, the transmission efficiency is improved by the amount of data embedded as a watermark by embedding the watermark information in the object data and transmitting it.
[0077]
Furthermore, since important information that is the basis of key information is embedded, a good effect in terms of security can be obtained.
[0079]
【The invention's effect】
  As described above, according to the present invention, copyrighted object data can be protected from unauthorized reproduction by a third party.There is an effect.
[Brief description of the drawings]
FIG. 1 is a block diagram showing a schematic basic configuration of an MPEG-4 player according to the present embodiment.
FIG. 2 is a functional block diagram for explaining the operation of the data processing apparatus according to the embodiment of the present invention.
FIG. 3 is a flowchart for explaining the operation of the data processing apparatus according to the present embodiment;
FIG. 4 is a functional block diagram of a data processing system including a data processing apparatus and a transmission side apparatus according to the present embodiment.

Claims (11)

A data processing method for separating and reproducing an object stream from a data stream including an object stream each having predetermined information,
Extracting copyright management information contained in the data stream;
Extracting watermark information contained in the object stream;
Generating key information using ID information unique to a user or device that receives and reproduces the data stream, the copyright management information, and the watermark information ;
A data processing method comprising controlling the object stream to be descrambled based on the key information. The data processing of claim 1, wherein the copyright based management information in said ID information to generate authentication information, wherein the key information based on the said authentication information the watermark information is generated Method. 3. The data processing method according to claim 1, wherein the copyright management information is included in a stream for protecting and managing the copyright . The data processing method according to any one of claims 1 to 3 , wherein the ID information is set in a data processing apparatus that separates, descrambles, and reproduces the object stream. 5. The data processing method according to claim 4 , wherein the ID information is incorporated in a storage medium connectable to the data processing apparatus. The data processing method according to any one of claims 1 to 5, characterized in that information of the object stream is high-efficiency encoding. The data stream includes at least one of an audio object stream, a still image object stream, a moving image stream, and a computer graphics stream, and a scene description information stream for synthesizing objects. The data processing method according to any one of 1 to 6 . A data processing apparatus for separating and reproducing an object stream from a data stream including the object stream,
Input means for inputting a data stream including at least one encrypted object stream each having predetermined information;
Separating means for separating the object stream from the data stream input by the input means;
Copyright management information extracting means for extracting copyright management information contained in the data stream;
Watermark information extracting means for extracting watermark information contained in the object stream;
Acquisition means for acquiring ID information embedded in the data processing device or a storage medium connectable to the data processing device;
Key information generating means for generating key information using the copyright management information , the watermark information and the ID information ;
Descrambling means for descrambling the object stream separated by the separation means based on the key information;
A data processing apparatus comprising: decoding means for decoding the predetermined information from the object stream descrambled by the descrambling means. And an authentication information processing unit configured to generate authentication information based on the copyright management information and the ID information, wherein the key information generation unit generates the key information based on the authentication information and the watermark information. The data processing apparatus according to claim 8 , wherein: 10. The data processing apparatus according to claim 8, wherein the copyright management information is included in a stream for protecting and managing the copyright . A computer-readable storage medium storing a computer program for executing the data processing method according to claim 1 and capable of being read by a computer.

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