JP2008103072A - Information processor and method, and recording medium - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To appropriately manage copy control by adding copy control information to main information. <P>SOLUTION: A depacketizing circuit 71 extracts EMIs included in the 1394 header of an isochronous packet transmitted via an IEEE 1394 serial bus 55, outputs it to an EMI analysis circuit 72, and decodes a transport packet included in data_field based on EMI for outputting it to a recording format encoder 74. The EMI analysis circuit 72 analyzes the input EMI, and an EMI-CPI encoder 73 outputs a CPI corresponding to the analyzed EMI. The recording format encoder 74 adds CCI_invalid_flag output by a generation circuit 75 and CPI output by the EMI-CPI encoder 73 to the transport packet for recording them on a storage medium 76. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to an information processing apparatus and method, and a recording medium, and more particularly, to an information processing apparatus and method and a recording medium that can perform copy restriction more reliably.

  FIG. 1 shows a configuration example of a conventional information recording / reproducing system. An IRD (Integrated Recorder / Decoder) 1, digital signal recording / reproducing apparatuses 2, 3, and digital signal reproducing apparatus 4 are connected to each other by an IEEE 1394 serial bus 5.

  The IRD 1 receives the satellite broadcast by the receiving circuit 11 and outputs the received transport stream to the packetizing circuit 12. The packetizing circuit 12 packetizes the input transport stream into isochronous packets (IP packets) based on the IEEE 1394 digital interface standard, and outputs them to the digital signal recording devices 2 and 3.

  The digital signal reproduction apparatus 4 corresponds to a storage medium 41 (the storage medium 41 corresponds to, for example, the storage medium 24 recorded in the digital signal recording apparatus 2 or the storage medium 33 recorded in the digital signal recording apparatus 3. ) Is reproduced and decoded by the recording format decoder 42. The transport stream output from the recording format decoder 42 is packetized by the packetizing circuit 43 and supplied to the digital signal recording devices 2 and 3 via the IEEE 1394 serial bus 5.

  The digital signal recording apparatus 2 has a depacketization circuit 21, which depackets the data of the isochronous packet input via the IEEE1394 serial bus 5 and passes the transport stream via the CCI rewrite circuit 22. And output to the recording format encoder 23. The depacketization circuit 21 also outputs the transport stream to the CCI analysis circuit 25. The CCI analysis circuit 25 extracts and analyzes copy control information (Copy Control Information (CCI)) included in the transport stream, and outputs the analysis result to the CCI encoder 26.

  The CCI encoder 26 encodes (changes) the input CCI into a new CCI, and outputs the new CCI to the CCI rewrite circuit 22. The CCI rewriting circuit 22 rewrites the CCI in the transport stream supplied from the depacketizing circuit 21 with the CCI supplied from the CCI encoder 26 and outputs the rewritten CCI to the recording format encoder 23. The recording format encoder 23 encodes the input transport stream and records it on the storage medium 24.

  The depacketization circuit 31 and the recording format encoder 32 of the digital signal recording apparatus 3 perform the same processing as the depacketization circuit 21 and the recording format encoder 23 of the digital signal recording apparatus 2, and the IEEE1394 serial bus 5 The transmitted data is recorded on the storage medium 33. The digital signal recording device 3 is not provided with the CCI analyzing circuit 25, the CCI encoder 26, and the CCI rewriting circuit 22 in the digital signal recording device 2. That is, the digital signal recording device 3 is a non-cognizant device that cannot understand the CCI recorded in the stream. On the other hand, the digital signal recording device 2 is a cognizant device capable of understanding the contents of the CCI.

  Next, the operation will be described. For example, when data received by the IRD 1 is recorded by the digital signal recording device 3, the following operation is performed. That is, when a signal of a predetermined channel is received by the receiving circuit 11 of the IRD 1, the transport stream is input to the packetizing circuit 12. The packetizing circuit 12 packetizes the input transport stream into isochronous packets and supplies them to the digital signal recording device 73 via the IEEE 1394 serial bus 5.

  In the digital signal recording device 3, the depacketizing circuit 31 depackets the input isochronous packet and outputs the transport stream to the recording format encoder 32. The recording format encoder 32 encodes the input transport stream by a predetermined method and records it on the storage medium 33.

  It is also possible to record the data output from the IRD 1 in the digital signal recording device 2. In this case, the depacketization circuit 21 depackets the isochronous packet input via the IEEE 1394 serial bus 5 and outputs the transport stream to the CCI rewrite circuit 22 and the CCI analysis circuit 25. The CCI analysis circuit 25 extracts and analyzes the CCI included in the input transport stream, and outputs the analysis result to the CCI encoder 26. If the input CCI is copy once (one copy is allowed), the CCI encoder 26 changes this to copy prohibited (copy prohibited), and if it is copy free, it is left as it is. If the CCI is copy prohibited, the CCI encoder 26 controls the CCI rewrite circuit 22 to prohibit the recording operation.

  When copy free or copy prohibited CCI is input from the CCI encoder 26, the CCI rewrite circuit 22 rewrites the CCI in the transport stream input from the depacketization circuit 21 with this CCI, and the recording format encoder 23 Output to. The recording format encoder 23 encodes the input transport stream and records it on the storage medium 24.

  In the above, the data output from the IRD 1 is recorded, but the data reproduced by the digital signal reproducing device 4 can also be recorded. In this case, the data reproduced from the storage medium 41 is decoded by the recording format decoder 42 and packetized into isochronous packets by the packetizing circuit 43. Then, the packetized data is transmitted to the digital signal recording devices 2 and 3 via the IEEE 1394 serial bus 5. Then, the recording operation is performed in the same manner as described above.

  The transport stream output from the receiving circuit 11 is an MPEG2 systems (ISO / IEC13818-1) transport stream, and a video stream and an audio stream are multiplexed in units of transport packets having a length of 188 bytes. For example, when the digital signal recording device 2 is a consumer use DVCR (Digital Video Cassette Recorder), the depacketizing circuit 21 generates a 188-byte transport packet of a transport stream of MPEG2 systems as shown in FIG. A 3-byte TSP_extra_header is added to 187 bytes excluding the first 1-byte sync byte, and output. The syntax of TSP_extra_header is configured as shown in FIG. That is, 21-bit time_stamp_counter is arranged in this TSP_extra_header. This time_stamp_counter represents the expected arrival time of the first bit of the first byte of the transport packet at the input of the smoothing buffer defined by ISO / IEC13818-1 (MPEG2 systems) or T-STD (Transport Stream System Target Decoder) ing.

  DVCR locks the clock with a frequency of 27 MHz to PCR (Program_Clock_Reference) included in the transport stream, and the clock counter when the first byte of the transport packet is input to the smoothing buffer or T-STD, It is added as time_stamp_counter of the transport packet. At the time of reproduction, when the clock counter value of the 27 MHz frequency clock possessed by the DVCR becomes equal to the time_stamp_counter value of the transport packet, a process of outputting the transport packet is performed.

  In the conventional system, since the copy is controlled based on the CCI in the cognizant apparatus capable of analyzing the CCI as described above, the copy can be correctly managed. However, in the case of a non-cognizant device, since the CCI cannot be analyzed, there is a problem that even if the CCI is copy prohibited, the data is recorded on the storage medium. In addition, when CCI is copy once, this permits one copy. Therefore, when copying is performed once, it is necessary to rewrite CCI from copy once to copy prohibited. Since this rewriting is not performed in the Zant device, copying is performed any number of times.

  The present invention has been made in view of such a situation, and makes it possible to correctly manage copies.

  The first information processing apparatus according to the present invention extracts, from input information, extraction means for extracting main information including the first copy control information and auxiliary information representing attributes of the main information, and the extraction means. And generating means for generating second copy control information based on the auxiliary information, and adding the second copy control information generated by the generating means to the main information extracted by the extracting means. First adding means.

  There is further provided generating means for generating information representing the validity of the first copy information, and second adding means for adding the information generated by the generating means to the main information extracted by the extracting means. be able to.

  The main information may be a transport stream, and the auxiliary information may be information indicating a mode in which the main information is encrypted.

  The first addition means may add the second copy control information for each transport packet of the transport stream.

  The information may be input through an IEEE1394 digital interface, and the auxiliary information may be EMI.

  Analyzing means for extracting and analyzing the first copy control information from the main information, and rewriting means for rewriting the first copy control information of the main information corresponding to the analysis result of the analyzing means. Further, it can be provided.

  Recording means for recording the main information, to which the second copy control information is added by the adding means, on a recording medium can be further provided.

  In the first information processing method of the present invention, an extraction step for extracting main information including the first copy control information and auxiliary information representing an attribute of the main information from input information, and extraction in the extraction step are performed. And generating the second copy control information based on the auxiliary information, and adding the second copy control information generated in the generation step to the main information extracted in the extraction step. Additional steps.

  The program recorded in the first recording medium of the present invention is an extraction step of extracting main information including first copy control information and auxiliary information representing attributes of the main information from input information, Based on the auxiliary information extracted in the extraction step, a generation step of generating second copy control information, and the second copy control information generated in the generation step are extracted in the extraction step. Causing the computer to execute a process including an additional step to be added to the main information.

  The second information processing apparatus according to the present invention includes, from input information, main information including first copy control information, and extraction means for extracting second copy control information added to the main information; Based on the second copy control information extracted by the extraction means, generation means for generating rewrite information for rewriting the first copy control information included in the main information, and generated by the generation means Rewriting means for rewriting the first copy control information of the main information extracted by the extracting means with the rewriting information.

  Reproducing means for reproducing the main information to which the second copy control information recorded on the recording medium is added can be further provided.

  The extraction means has means for extracting information representing the validity of the first copy control information from the input information, and based on the information representing the validity extracted by the extraction means, There may be further provided output means for outputting one of the main information in which the first copy control information has been rewritten by the rewrite means or the main information in which the first copy control information has not been rewritten.

  The second information processing method of the present invention includes, from input information, an extraction step of extracting main information including the first copy control information and second copy control information added to the main information; Based on the second copy control information extracted in the extraction step, a generation step for generating rewrite information for rewriting the first copy control information included in the main information, and the generation step generated in the generation step A rewriting step of rewriting the first copy control information of the main information extracted in the extraction step with rewriting information.

  The program recorded on the second recording medium of the present invention extracts main information including first copy control information and second copy control information added to the main information from input information. An extracting step for generating, rewriting information for rewriting the first copy control information included in the main information based on the second copy control information extracted in the extracting step, and the generating step And a rewriting step of rewriting the first copy control information of the main information extracted in the extraction step with the rewriting information generated in step (b).

  In the first information processing apparatus and method and the program recorded on the recording medium of the present invention, the main information including the first copy control information and the auxiliary information representing the attribute of the main information are input from the input information. Is extracted, and second copy control information is generated based on the extracted auxiliary information. Also, the generated second copy control information is added to the extracted main information.

  In the second information processing apparatus and method and the program recorded on the recording medium of the present invention, the main information including the first copy control information is added to the main information from the input information. Second copy control information is extracted, and rewrite information for rewriting the first copy control information included in the main information is generated based on the extracted second copy control information. Further, the first copy control information of the extracted main information is rewritten with the generated rewrite information.

  According to the present invention, copying can be managed correctly.

  Next, a configuration example of a network system to which the present invention is applied will be described with reference to FIG. In FIG. 4, an IRD 51, a non-cognizant recorder 52, a digital signal reproduction device 53, and a cognizant recorder 54 are connected to each other via an IEEE 1394 serial bus 55. The IEEE 1394 serial bus 55 capable of transmitting and receiving data bidirectionally is connected to each other in cascade. For convenience of explanation, the outputs of the IRD 51 and the digital signal reproducing device 53 are non-cognizant. It is shown supplied to a recorder 52 and a cognizant recorder 54.

  The reception circuit 61 of the IRD 51 receives broadcast radio waves transmitted via a satellite (not shown) and outputs a transport stream of a predetermined channel to the CCI analysis circuit 62. This transport stream is a transport stream of MPEG2 systems (ISO / IEC13818-1), and a video stream and an audio stream are multiplexed in units of a transport packet having a length of 188 bytes.

  The CCI analysis circuit 62 extracts the CCI contained therein from the input transport stream and outputs it to the CCI-EMI encoder 63. The storage location in the CCI transport stream differs depending on the application. For example, the copyright_extension of the video layer or the PES_scrambling_control of the PES_packet is used. There are three types of CCI contents: copy prohibited, copy once, and copy free.

  The CCI-EMI encoder 63 generates encryption mode information (Encryption_Mode Indicator (EMI)) based on the CCI input from the CCI analysis circuit 62 and outputs it to the packetization circuit 64. This EMI is being standardized by the Data Transmission Discussion Group (DTDG) together with CCI. There are three types of EMI: mode A (proh), mode B (once), and free. is there. Mode A is a mode for copy prohibited data, mode B is a mode for copy once data, and free is a mode for copy free unencrypted content data. The packetizing circuit 64 packetizes the transport packet of the transport stream supplied from the CCI analyzing circuit 62 into an isochronous packet of the IEEE 1394 serial bus 55 and outputs the packet. At this time, the packetizing circuit 64 encrypts the transport packet based on the EMI.

  The digital signal reproduction device 53 is recorded in a storage medium 81 (this storage medium corresponds to the storage medium 76 recorded by the non-cognizant recorder 52 or the storage medium 101 recorded by the cognizant recorder 54). Data is reproduced and decoded by the recording format decoder 82. The recording format decoder 82 extracts a CPI (Copy_Permission_Indicator) in the video stream supplied from the storage medium 81, outputs this to the CPI-EMI encoder 83, decodes the input data, and outputs the transport packet. Is output to the packetizing circuit 84.

  Although details of the CPI will be described later, this CPI is added to the transport packet by the recording format encoder 74 of the non-cognizant recorder 52 or the recording format encoder 99 of the cognizant recorder 54. . This CPI is represented by 2 bits as shown in FIG. 5, its value 00 represents copy free, its value 10 represents copy once, and its value 11 represents copy prohibited.

  The CPI-EMI encoder 83 generates EMI based on the input CPI and outputs it to the packetizing circuit 84. The packetizing circuit 84 encrypts the transport packet supplied from the recording format decoder 82 based on the EMI output from the CPI-EMI encoder 83, packetizes it into an isochronous packet, and converts the EMI into the isochronous packet. Is added.

  The isochronous packet generated by the packetizing circuit 64 of the IRD 1 and the packet circuit 84 of the digital signal reproducing device 53 is configured as shown in FIG. As shown in the figure, the first 8 bytes are a 1394 header, the next 8 bytes are a CIP (Common Isochronous Paket) header, and a data field is arranged subsequently. In addition to the data length (data_length), channel number (channel), etc., the EMI described above is arranged in the 1394 header. In CIPheader, DBS (Data Block Size in quadlets), FN, and the like are arranged in addition to the source node ID (SID) indicating the data transmission source. DBS is a field that records the size of a data block (unit of packetization), and FN is a field that describes the number divided when packetized. DBC (data block continuity counter) is also arranged in CIPheader.

  Data of the transport stream is arranged in data_field of the data field. In other words, the 188-byte transport packet of the transport stream output from the CCI analysis circuit 62 is added with a 4-byte source packet header as shown in FIG. 7 to form a 192-byte source packet. One source packet is divided into 24 bytes × 8 data blocks. N data blocks are arranged in the data_field. The number N of data blocks included in one isochronous packet is 0, 1, 2, 4 or a multiple of 8, and the value of N is the CIPheader value. Described in DBC.

  The depacketizing circuit 71 of the non-cognizant recorder 52 depackets the isochronous packet transmitted from the IRD 51 or the digital signal reproducing device 53 via the IEEE1394 serial bus 55, extracts the EMI contained in the 1394 header, and extracts the EMI analysis circuit. 72. Further, the depacketizing circuit 71 extracts the transport packet of the transport stream arranged in the data_field in the isochronous packet, decodes it based on EMI (plain culture), and supplies it to the recording format encoder 74 To do.

  The EMI analysis circuit 72 analyzes the input EMI and outputs the analysis result to the EMI-CPI encoder 73. The EMI-CPI encoder 73 generates a CPI corresponding to the input EMI and outputs it to the recording format encoder 74. That is, the EMI-CPI encoder 73 performs a process reverse to that of the CPI-EMI encoder 83 of the digital signal reproducing device 53.

  The generation circuit 75 generates a value 1 as CCI_invalid_flag and outputs it to the recording format encoder 74. The recording format encoder 74 encodes the transport packet supplied from the depacketizing circuit 71, and adds the CPI supplied from the EMI-CPI encoder 73 and the CCI_invalid_flag supplied from the generating circuit 75 to the outside. Then, data having a syntax of VDR_MPEG2_transport_stream as shown in FIG. 8 is generated, supplied to the storage medium 76, and recorded.

  As shown in FIG. 8, the VDR_MPEG2_transport_stream output from the recording format encoder 74 has a configuration in which TSP_extra_information () is added to transport_packet () (the transport packet output from the depacketization circuit 71 is arranged here). Has been.

  The syntax of TSP_extra_information () is shown in FIG. As shown in the figure, this TSP_extra_information () includes CPI (copy_permission_indicator) output from the EMI-CPI encoder 73 and CCI_invalid_flag output from the generation circuit 75.

  As shown in FIG. 10, the TSP_extra_information () may be added before transport_packet ().

  In the cognizant recorder 54, the depacketizing circuit 91 depackets the isochronous packet input via the IEEE1394 serial bus 55, extracts the EMI contained in the 1394 header, and outputs it to the EMI analysis circuit 96. Further, the depacketizing circuit 91 decodes the transport packet included in the data field of the isochronous packet based on the EMI, and outputs it to the CCI analyzing circuit 92 and the CCI rewriting circuit 95.

  The EMI analysis circuit 96 analyzes the input EMI and outputs the analysis result to the EMI-CCI encoder 97 or the EMI-CPI encoder 98. The EMI-CCI encoder 97 generates CCI corresponding to the input EMI, and outputs the CCI to the CCI rewriting circuit 95 via the contact B of the switch 94. The EMI-CPI encoder 98 generates a CPI corresponding to the input EMI and outputs it to the recording format encoder 99. The EMI analysis circuit 96 and the EMI-CPI encoder 98 perform basically the same processing as the EMI analysis circuit 72 and the EMI-CPI encoder 73 of the non-cognizant recorder 52.

  The CCI analysis circuit 92 analyzes the CCI included in the transport packet of the input transport stream and outputs the analysis result to the CCI encoder 93. The CCI encoder 93 changes the input CCI to a new CCI, and outputs the new CCI to the CCI rewriting circuit 95 via the contact A of the switch 94. The CCI analysis circuit 92 and the CCI encoder 93 are basically the same as the CCI analysis circuit 25 and the CCI encoder 26 of the conventional digital signal recording apparatus 2 shown in FIG.

  Before recording, the CCI rewrite circuit 95 uses the IEEE 1394 serial bus 55 to store the storage medium 81 in the storage medium 76 recorded by the non-cognizant recorder 52 or the storage medium recorded by the cognizant recorder 54. 101 is recognized.

  When the storage medium 81 is the storage medium 76 recorded by the non-cognizant recorder 52, the switch 94 is switched to the contact A side, and the CCI rewrite circuit 95 changes to the transport packet supplied from the depacketizing circuit 91. The included CCI is rewritten with the CCI supplied from the CCI encoder 93 and output to the recording format encoder 99. The recording format encoder 99 is also supplied with CCI_invalid_flag having a value (0) indicating that the CCI included in the transport packet output from the generation circuit 100 is valid. On the other hand, CCI_invalid_flag output from the generation circuit 75 of the non-cognitive recorder 52 is a value (1) indicating that the CCI included in the transport packet is invalid.

  When the storage medium 81 is the storage medium 101 recorded by the cognizant recorder 54, the switch 94 is switched to the contact B side, and the EMI value output from the EMI analysis circuit 96 is changed to the EMI-CCI encoder. 97. The CCI rewriting circuit 95 rewrites the CCI included in the transport packet supplied from the depacketizing circuit 91 with the CCI supplied from the EMI-CCI encoder 97 and outputs the rewritten data to the recording format encoder 99. At this time, the recording format encoder 99 is supplied with CCI_invalid_flag of the value (0) output from the generation circuit 100.

  The recording format encoder 99 encodes the transport packet supplied from the CCI rewriting circuit 95 into a recording format for storage media (similar to the case described above, the format is VDR_MPEG2_transport_stream shown in FIG. 8), and stores it in the storage format. The data is supplied to the medium 101 and recorded.

  Next, the operation will be described by taking as an example the case where the data output from the IRD 51 or the digital signal reproduction device 53 is recorded in the non-cognizant recorder 52 or the cognizant recorder 54.

  When recording the output of the IRD 51, the receiving circuit 61 receives a broadcast wave of a predetermined channel and outputs a transport stream. As described above, this transport stream is a transport stream defined by MPEG2 systems (ISO / IEC13818-1). The CCI analysis circuit 62 extracts CCI stored in a predetermined storage location of the input transport stream, analyzes this, and outputs the analysis result to the CCI-EMI encoder 63. The CCI storage location is defined by the application, and is, for example, copyright_extension of the video layer or PES_scrambling_control of the PES_packet. The CCI is either copy prohibited, copy once, or copy free.

  The CCI-EMI encoder 63 determines EMI based on the input CCI. As described above, this EMI is information indicating a mode in which data included in the payload (data_field) of the isochronous packet is encrypted, and is set to one of three modes of A mode, B mode, and free. The When CCI is copy prohibited, EMI is set to mode A. When CCI can be copied once, EMI is set to mode B. When CCI is copy-free, EMI is free (not encrypted).

  The CCI analysis circuit 62 outputs the transport stream transport packet supplied from the receiving circuit 61 to the packetizing circuit 64. The packetization circuit 64 performs isochronous packetization processing on the transport packet supplied from the CCI analysis circuit 62 according to the MPEG TS protocol. That is, as shown in FIG. 7, a 4-byte source packet header is added to the head of a 188-byte transport packet to form a 192-byte source packet. The source packet is divided into 24 bytes × 8 data blocks, and N data blocks are written in the data_field of the isochronous packet. This data is encrypted in response to EMI. That is, when EMI is in mode A, data is encrypted in mode A, and when EMI is in mode B, data is encrypted in mode B. If EMI is free, data is not encrypted. This EMI is added to the 1394 header as shown in FIG.

  The isochronous packet generated by the packetizing circuit 64 is output to the IEEE 1394 serial bus 55.

  When recording a signal reproduced by the digital signal reproduction device 53, the storage medium 81 is reproduced by the digital signal reproduction device 53, and the reproduced data is decoded by the recording format decoder 82. The recording format decoder 82 outputs the transport packet obtained as a result of decoding to the packetizing circuit 84, extracts the CPI added outside the transport packet, and outputs it to the CPI-EMI encoder 83. The CPI-EMI encoder 83 generates EMI corresponding to the input CPI and outputs it to the packetizing circuit 84. As shown in FIG. 5, this CPI is set to either copy prohibition (11), copy once (10), or copy free (00). The CPI-EMI encoder 83 sets the EMI to mode A when the CPI is copy-inhibited, sets the EMI to mode B when the CPI can be copied once, and sets the EMI to free when the CPI is copy-free.

  The packetizing circuit 84 executes a process for converting the transport packet input from the recording format decoder 82 into an isochronous packet according to the MPEG TS protocol. That is, the packetizing circuit 84 performs substantially the same processing as the packetizing circuit 64 of the IRD1. Then, the isochronous packet generated by the packetizing circuit 84 is output to the IEEE 1394 serial bus 55.

  The isochronous packet output from the IRD 51 and the isochronous packet output from the digital signal reproducing device 53 are transmitted using slots of the IEEE1394 serial bus 55 having different timings of 125 μs.

  The recording process in the non-cognizant recorder 52 is as follows. The depacketizing circuit 71 depackets the isochronous packet input via the IEEE 1394 serial bus 55, extracts the EMI contained in the 1394 header of the isochronous packet, and outputs it to the EMI analysis circuit 72. Further, the depacketizing circuit 71 extracts the transport packet of the transport stream held in the data_field, decodes (unencrypts) based on the 1394 header EMI, and outputs it to the recording format encoder 74.

  The EMI analysis circuit 72 analyzes the input EMI and outputs the analysis result to the EMI-CPI encoder 73. When the transport packet is divided into a plurality of isochronous packets and each EMI is different, the EMI analysis circuit 72 represents the EMI corresponding to the strongest copy restriction mode among the EMIs of the respective isochronous packets. This is output to the EMI-CPI encoder 73 as a value. For example, when the transport packet is divided into two isochronous packets, and the EMI of each isochronous packet is mode A (proh) and copy free, the representative value of EMI is mode A (proh) It is said.

  The EMI-CPI encoder 73 converts the EMI input from the EMI analysis circuit 72 into a corresponding CPI. When EMI is copy once, CPI is copy prohibited. When EMI is copy free, CPI is copy free. The CPI output from the EMI-CPI encoder 73 is output to the recording format encoder 74.

  When EMI is copy prohibited, the EMI-CPI encoder 73 controls the recording format encoder 74 to prohibit the recording operation.

  The generation circuit 75 outputs the value 1 to the recording format encoder 74 as CCI_invalid_flag. In other words, the non-cognizant recorder 52 cannot understand the CCI inside the transport packet (does not have a CCI analysis circuit). Therefore, a flag indicating that the CCI included in the transport packet to be recorded on the storage medium 76 is not a valid value (is an invalid value) is recorded.

  The recording format encoder 74 encodes the transport packet supplied from the depacketization circuit 71 into a recording format for the storage medium, and records it in the storage medium 76 as VDR_MPEG2_transport_stream () having the structure shown in FIG. As shown in FIG. 8, this VDR_MPEG2_transport_stream () includes TSP_extra_information (), and this TSP_extra_information () holds CPI (copy_permission_indicator) and CCI_invalid_flag as shown in FIG.

  On the other hand, in the cognizant recorder 4, when the depacketizing circuit 91 receives the isochronous packet via the IEEE 1394 serial bus 55, the EMI included in the 1394 header of the isochronous packet is extracted and output to the EMI analyzing circuit 96. Further, the depacketizing circuit 91 separates the transport packet of the transport stream held in the data_field of the isochronous packet, decodes it based on EMI, and outputs it to the CCI rewriting circuit 95 and the CCI analyzing circuit 92.

  The CCI analysis circuit 92 has the same function as the CCI analysis circuit 62 of the IRD 51, analyzes the CCI stored in the input transport packet, and outputs it to the CCI encoder 93. The storage location in the CCI transport packet is defined by the application. The CCI encoder 93 updates the CCI input from the CCI analysis circuit 92 as necessary. When the input CCI is copy once, the new CCI is copy prohibited. When the input CCI is copy free, the new CCI is copy prohibited. The new CCI is supplied from the CCI encoder 93 to the CCI rewrite circuit 95. Note that when the CCI input from the CCI analysis circuit 92 is copy prohibited, the CCI encoder 93 controls the CCI rewrite circuit 95 to prohibit the recording operation.

  The CCI rewrite circuit 95 rewrites the CCI in the transport packet input from the depacketization circuit 91 with the CCI supplied from the CCI encoder 93 and then outputs it to the recording format encoder 99.

  The EMI analysis circuit 96, EMI-CPI encoder 98, and recording format encoder 99 are basically the same as the EMI analysis circuit 72, EMI-CPI encoder 73, and recording format encoder 74 of the non-cognizant recorder 52. Process. That is, the CPI supplied from the EMI-CPI encoder 98 and the CCI_invalid_flag supplied from the generating circuit 100 are added to the transport packet input from the depacketizing circuit 91 via the CCI rewriting circuit 95, and FIG. This is recorded in the storage medium 101 as VDR_MPEG2_transport_stream. However, the value of CCI_invalid_flag output from the generation circuit 100 is 0. That is, the cognizant recorder 54 has a CCI analysis circuit 92, and has a function of analyzing the CCI held in the transport packet. As described above, since the CCI is rewritten to a new (correct) CCI by the CCI encoder 93 and the CCI rewriting circuit 95, the CCI included in the transport packet recorded in the storage medium 101 is a correct value. Has become. Therefore, CCI_invalid_flag is set to 0 to indicate that this CCI is a valid CCI.

  As described above, the storage medium 76 or the storage medium 101 on which the transport stream transmitted via the IEEE 1394 serial bus 55 is recorded is reproduced by a reproducing apparatus as shown in FIG. In this playback apparatus, a signal reproduced from the storage medium 101 (or 76) is decoded by a recording format decoder 111, and a transport packet of the obtained transport stream is converted to a CCI rewrite circuit 114 via a contact c1 of a switch 113. Or output to the contact c0 of the switch 115 via the contact c0 of the switch 113. The recording format decoder 111 also separates the CPI and CCI_invalid_flag from the input signal, outputs the CPI to the CPI-CCI encoder 112, and outputs the CCI_invalid_flag to the switch 113 and the switch 115 as its switching control signal.

  The CPI-CCI encoder 112 converts the input CPI into CCI and outputs it to the CCI rewrite circuit 114. The CCI rewrite circuit 114 rewrites the CCI of the transport packet input from the recording format decoder 111 via the contact c1 of the switch 113 with the CCI supplied from the CPI-CCI encoder 112, and outputs it to the contact c1 of the switch 115. is doing. The switch 115 selects a signal supplied to either the contact c1 or the contact c0 and outputs it from the output terminal 116.

  Next, the operation will be described. As described above, the storage medium 76 or the storage medium 101 is recorded in the format of VDR_MPEG2_transport_stream shown in FIG. 8, and the recording format decoder 111 separates the transport packet from the signal of this format and switches it to the switch 113. Output to. Further, the recording format decoder 111 extracts the CPI and CCI_invalid_flag included in the input VDR_MPEG2_transport_stream (), and outputs them to the CPI-CCI encoder 112 or the switches 113 and 115, respectively.

  The switches 113 and 115 switch the switches 113 and 115 to the contact c0 side when CCI_invalid_flag is 0, that is, when the CCI of the transport packet output from the recording format decoder 111 is valid. Therefore, when it is the storage medium 101 recorded by the cognizant recorder 54 that is currently being reproduced, the transport packet output from the recording format decoder 111 is the contact c0 of the switch 113 and the contact of the switch 115. The signal is output as it is from the output terminal 116 via c0.

  On the other hand, when CCI_invalid_flag is 1, that is, when the CCI included in the transport packet output from the recording format decoder 111 is an invalid CCI, the switches 113 and 115 are switched to the contact c1 side. That is, when the storage medium 76 recorded by the non-cognizant recorder 52 is being reproduced, the switches 113 and 115 are switched to the contact c1 side.

  The CPI-CCI encoder 112 converts the input CPI into a corresponding CCI. That is, when CPI is copy once, CCI is copy once, when CPI is copy prohibited, CCI is copy prohibited, and when CPI is copy free, CCI is copy free.

  The CCI rewrite circuit 114 rewrites the CCI included in the transport packet input from the recording format decoder 111 via the contact c1 of the switch 113 with the CCI supplied from the CPI-CCI encoder 112, and contacts the switch 115. Output from the output terminal 116 via c1.

  Thus, in this playback apparatus, even when the storage medium 76 recorded by the non-cognizant recorder 52 is played back, the CCI is rewritten, so that the output transport stream is stored in the cognizant recorder. The transport stream recorded at 54 is the same as the transport stream reproduced from the storage medium 101. Therefore, when it is attempted to record with a cognizant recorder capable of analyzing CCI thereafter, it becomes possible to manage the copy accurately in accordance with the copy control information.

  In the above, CCI and CCI_invalid_flag are recorded for each transport packet. However, each CCI and CCI_invalid_flag are recorded for each of a plurality of arbitrary number of transport packets, for each program unit, or for each cut (scene). For example, recording may be performed for each predetermined unit.

  Further, CPI and CCI_invalid_flag may be recorded in another stream independent of the transport stream. For example, when a plurality of transport stream programs are recorded on a storage medium, a database stream representing the recording contents of the storage medium may be prepared, and CPI and CCI_invalid_flag may be recorded there.

  Furthermore, in the above description, the case of recording a transport stream has been described as an example. However, the present invention can also be applied to the case of recording a program stream. In this case, the program stream has the configuration of VDR_MPEG2_program_stream in FIG. There, PSP_extra_information () is arranged, and as shown in FIG. 13, CPI and CCI_invalid_flag are recorded therein.

  Furthermore, the present invention can also be applied when recording a DV stream. In this case, the DV stream has a configuration indicated by VDR_ST_DVCR_stream in FIG. 14, and CPI and CCI_invalid_flag are arranged in SD_DVCR_frame_exra_information () therein as shown in FIG. 15.

  In the present specification, the term “system” represents the entire apparatus constituted by a plurality of apparatuses.

  As a recording medium for providing a user with a computer program for performing the processing as described above, a communication medium such as a network or a satellite can be used in addition to a magnetic disk, a CD-ROM, a solid memory, or the like.

It is a block diagram which shows the structural example of the conventional network system. It is a figure explaining the format of a transport packet. It is a figure explaining TSP_extra_header. It is a block diagram which shows the structural example of the network system to which the information processing apparatus of this invention is applied. It is a figure explaining copy_permission_indicator. It is a figure explaining an isochronous packet. It is a figure explaining a source packet. It is a figure explaining VDR_MPEG2_transport_stream. It is a figure explaining TSP_extra_information. It is another figure explaining VDR_MPEG2_transport_stream. It is a block diagram which shows the structural example of the information reproduction apparatus to which this invention is applied. It is a figure explaining VDR_MPEG2_program_stream. It is a figure explaining PSP_extra_information. It is a figure explaining VDR_SD_DVCR_stream. It is a figure explaining SD_DVCR_frame_extra_information.

Explanation of symbols

  51 IRD, 52 Non-cognizant recorder, 53 Digital signal reproduction device, 54 Cognizant recorder, 61 Receiver circuit, 62 CCI analysis circuit, 63 CCI-EMI encoder, 64 Packetization circuit, 71 Depacketization circuit, 72 EMI analysis circuit, 73 EMI-CPI encoder, 74 recording format encoder, 75 generation circuit, 76 storage media, 91 depacketization circuit, 92 CCI analysis circuit, 93 CCI encoder, 94 switch, 95 CCI rewrite circuit, 96 EMI analysis circuit, 97 EMI -CCI encoder, 98 EMI-CPI encoder, 99 recording format encoder, 100 generator, 101 storage media

Claims (14)

Extraction means for extracting main information including first copy control information and auxiliary information representing attributes of the main information from input information;
Generating means for generating second copy control information based on the auxiliary information extracted by the extracting means;
An information processing apparatus comprising: a first adding unit that adds the second copy control information generated by the generating unit to the main information extracted by the extracting unit. Generating means for generating information representing the validity of the first copy information;
The information processing apparatus according to claim 1, further comprising: a second addition unit that adds the information generated by the generation unit to the main information extracted by the extraction unit. The main information is a transport stream,
The information processing apparatus according to claim 1, wherein the auxiliary information is information representing a mode in which the main information is encrypted. The information processing apparatus according to claim 3, wherein the first adding unit adds the second copy control information for each transport packet of the transport stream. The information is input via an IEEE1394 digital interface,
The information processing apparatus according to claim 1, wherein the auxiliary information is EMI. Analyzing means for extracting and analyzing the first copy control information from the main information;
The information processing apparatus according to claim 1, further comprising: a rewriting unit that rewrites the first copy control information of the main information corresponding to an analysis result of the analysis unit. The information processing apparatus according to claim 1, further comprising: a recording unit that records the main information, to which the second copy control information is added by the adding unit, on a recording medium. An extraction step of extracting main information including the first copy control information and auxiliary information representing an attribute of the main information from the input information;
A generation step of generating second copy control information based on the auxiliary information extracted in the extraction step;
An information processing method comprising: an addition step of adding the second copy control information generated in the generation step to the main information extracted in the extraction step. An extraction step of extracting main information including first copy control information and auxiliary information representing the attribute of the main information from the input information;
A generation step of generating second copy control information based on the auxiliary information extracted in the extraction step;
An addition step of adding the second copy control information generated in the generation step to the main information extracted in the extraction step. A recording medium that causes a computer to execute the program. Extraction means for extracting main information including first copy control information and second copy control information added to the main information from input information;
Generating means for generating rewrite information for rewriting the first copy control information included in the main information based on the second copy control information extracted by the extracting means;
An information processing apparatus comprising: rewriting means for rewriting the first copy control information of the main information extracted by the extracting means with the rewriting information generated by the generating means. The information processing apparatus according to claim 10, further comprising: a reproducing unit that reproduces the main information to which the second copy control information recorded on a recording medium is added. The extraction means includes means for extracting information representing the validity of the first copy control information from the input information;
The main information in which the first copy control information has been rewritten by the rewriting means, or the first copy control information has not been rewritten based on the information representing the validity extracted by the extracting means The information processing apparatus according to claim 10, further comprising output means for outputting one of the main information. An extraction step of extracting main information including first copy control information and second copy control information added to the main information from input information;
Based on the second copy control information extracted in the extraction step, a generation step for generating rewrite information for rewriting the first copy control information included in the main information;
A rewriting step of rewriting the first copy control information of the main information extracted in the extraction step with the rewriting information generated in the generating step. An extraction step of extracting main information including first copy control information and second copy control information added to the main information from input information;
A generation step of generating rewrite information for rewriting the first copy control information included in the main information based on the second copy control information extracted in the extraction step;
A rewriting step of rewriting the first copy control information of the main information extracted in the extracting step with the rewriting information generated in the generating step. .

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