JP2008017379A - Apparatus and method for receiving and recording - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an apparatus and a method for receiving and recording which can protect a content properly. <P>SOLUTION: The apparatus for receiving and recording is provided with a receiving means which receives content information constituting the content, classification information showing the classification of the content information and protection information showing whether the content is to be protected, a recording means which records the content information received by the receiving means and the classification information showing the classification of the content information, and a control means which controls each constitution. The control means controls the recording means to record information different from the received classification information in place of the received classification information corresponding to the content information when the protection information shows that the content is to be protected. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a reception recording apparatus and a reception recording method.

  Patent Document 1 discloses a content right protection device used in a playback device that plays back broadcast content that has been encrypted and recorded in a storage device. The content protection right protection device is a broadcast content right protection device that generates a decryption key for decrypting broadcast content from decryption information included in the broadcast content at a predetermined time interval, and the broadcast content right protection device records broadcast content recorded in the storage device. Viewing determination means for determining whether or not viewing is legitimate viewing using permission information regarding use of broadcast content, and generation of a decryption key is stopped when the viewing determination means determines that the viewing is illegal And a key generation stop means for performing the above.

JP 2005-12349 A

  Even if you protect against unauthorized viewing by encrypting content, after decrypting in a legitimate or unauthorized manner, you can separate the decrypted content itself from the protection information, There is a possibility of being left out of protection. In that case, the content that has been separated cannot be prevented from being illegally viewed, duplicated or distributed.

  An object of the present invention is to provide a reception recording apparatus and a reception recording method capable of protecting appropriate contents.

  In order to achieve the above object, the reception recording apparatus of the present invention includes content information constituting content, type information indicating a type of the content information, and protection information indicating whether or not the content is protected. Receiving means for receiving, recording means for recording content information received by the receiving means and type information indicating the type of the content information, and control means for controlling each of the components, wherein the control means comprises the When the protection information indicates that the content is protected, the recording unit is controlled to record information different from the received type information in association with the content information instead of the received type information. It is characterized by doing.

  According to the present invention, it is possible to provide a reception recording apparatus and a reception recording method capable of appropriately protecting content.

  Hereinafter, as an example of a reception recording apparatus or a reception recording method, a method for a mobile phone to receive and record a program broadcast in the TS format by digital broadcasting will be described with reference to the drawings. In this example, when recording a program for which content protection is set so that the main information (video information, audio information, subtitle information, etc.) of the broadcasted program itself is in a non-playable state by default. The PID value of the packet is modified and recorded. Then, by recording the modified PID value in a dedicated data area for storing the PID value, a protected state is realized even with the main body information alone. Note that PID (Packet Identifier) is information indicating the attribute and type of a packet.

  Other examples of the reception recording device include a recording device such as an HDD recorder with a built-in terrestrial digital broadcast reception tuner, a set-top box with a built-in terrestrial digital broadcast reception tuner, a laptop computer with a built-in terrestrial digital broadcast reception tuner, etc. There is. The broadcast signal may be received from an external antenna module or the like.

  FIG. 1 is a diagram showing an example of a method for determining the protection status of a program.

  First, in step 300, reception of a digital broadcast program is started. The contents of the packet data received at step 301 are analyzed and determined. Subsequently, in step 302, it is determined whether program data characteristic information (PMT: Program Map Table) is detected in the received packet. If no program data characteristic information (PMT) is detected in step 302, the process returns to step 301. If the program data characteristic information (PMT) is detected in step 302, the process proceeds to step 303, and the presence / absence of information on the PID value for each packet data in the program data characteristic information (PMT) is analyzed. Following step 303, in step 304, content protection information (CPI: Contents Protection Information) in the program data characteristic information (PMT) is extracted. Subsequent to step 304, in step 305, it is determined whether or not the content protection information (CPI) indicates content protection settings. If it is determined in step 305 that the program is protected, the process proceeds to step 310 to enter a mode for recording with PID modification. If the program is not protected, the process proceeds to step 308 to enter a mode for recording without PID modification. Note that the program data characteristic information is information that stores the PID of a TS packet having each encoded signal constituting a program, related information on pay broadcasting, and the like. The content protection information is information indicating whether content such as a broadcast program is protected. The content protection setting means a setting for protecting content such as a program. Possible types of protection include protection by restricting reproduction, protection by restricting duplication, protection by restricting reproduction of copied programs, and the like. As CPI, for example, CCI (Copy Control Information) in terrestrial digital broadcasting may be used.

  FIG. 2 is a diagram illustrating an example of a method for modifying the PID value of the packet data to be protected. The packet data to be protected is packet data constituting a program such as, for example, Video packet data, Audio packet data, PCR packet data, Caption packet data.

  First, in step 311, PID modification recording is started. In the following step 312, it is determined whether or not the packet data to be recorded is packet data of the type to be protected. If the packet data to be recorded is packet data to be protected, in step 313, the setting area for the PID value of the packet is modified. Subsequently, in step 314, the packet data to be protected whose PID value has been altered is sent as data for writing to the medium. Subsequently, in step 315, it is determined whether or not a recording stop instruction has been issued. If it is determined in step 315 that a recording stop instruction has been issued, in step 316, a PID value for recording in a specific area is set. Following step 316, recording is terminated at step 317. As will be described later, the specific area is an area provided in a removable recording medium or playback device in order to record a modified PID value of a packet to be protected. The legitimate playback device determines the PID value assigned to the video packet or the like by referring to the modified PID value recorded in the specific area.

  If it is determined in step 312 that the packet is not a protection target, or if it is determined in step 315 that there is no recording stop instruction, the process returns to step 312 to continue to determine the protection target of the packet.

  Through the above processing, it is possible to record and hold the content for which protection has been set on the medium by changing the PID value of a predetermined type of packet. As a result, data that cannot be reproduced can be obtained even in a state where only the data main body is alone, and stronger content protection is realized.

  FIG. 3 is a diagram illustrating an example of a method for modifying PID values of a plurality of types of packets to be protected. FIG. 3 shows an example of packet type determination processing and PID value modification processing when there are four types of packet data to be protected: Video packet, Audio packet, PCR (Program Clock Reference) packet, and Caption packet. Note that the PCR packet is a packet including information indicating a time reference at which the playback device plays back a Video packet, an Audio packet, a PCR packet, or the like.

  The process for determining whether or not the packet to be recorded is a packet to be protected includes a step 317 for determining whether the packet type of the received packet is Video, a step 318 for determining whether the packet type is Audio, and a packet type is PCR. Step 319 for determining whether or not the packet type is Caption, and Step 323 for determining whether or not the packet type is Caption. If it is determined in step 317 that the packet type is Video, if it is determined in step 318 that the packet type is Audio, if it is determined in Step 319 that the packet type is PCR, then in Step 323 the packet type is Caption. If it is discriminated, the process proceeds to step 313 for modifying the setting value of the PID value. In any of the steps 317, 318, 319, and 323, if it is determined that the packet data does not correspond to the type of protection target, the process proceeds to step 312.

  By such a mechanism, processing for modifying the PID value is realized in order to protect the video packet data, the audio packet data, the PCR packet data, and the caption packet data.

  In FIG. 3, a plurality of types of packets are targeted for protection, but a configuration may be adopted in which only some types of packets are targeted for protection. For example, it is also possible to store, as copy control information CPI, that only two types of packets, Video packets and Audio packets, are to be protected, and PCR packets and Caption packets are not protected. Thus, even if video and audio are recorded, illegal processing cannot be performed, but only subtitles can be copied or reproduced. As described above, according to the present embodiment, it is possible to protect a variety of programs.

  Further, the type of packet to be protected may be specified by content protection information. Further, the type of packet to be protected may be predetermined. If the protection target is specified in the content protection information, it is possible to specify data to be protected for the convenience of the content sender.

  FIG. 4 is a diagram showing an example of packet data to be recorded before or after modification and a PID value setting area included in the packet data.

  FIG. 4A is an example of a part of the packet data of the received digital broadcast program. The PMT (Program Map Table) information packet data 201, the video packet data 202, the audio packet data 203, and the PCR packet of the TS packet. This is an example of data 204 and Caption packet data 205. Within each packet data, there is an area 200 for storing a PID value indicating the type of the packet data.

  At the time of reception, in the PMT information area in the PMT packet 201, PID = 0x0270 of the video packet, PID = 0x0320 of the audio packet, PID = 0x0190 of the PCR packet, and PID = 0x0480 of the caption packet are set. Similarly, 0x0270 is stored in the PID value setting area in the Video packet 202, and 0x0320 is stored in the PID value setting area in the Audio packet 203, and the PID value in the PCR packet 204 is stored in the PID value setting area. In the setting area, 0x0190 is stored, and in the PID value setting area in the Caption packet 205, 0x480 is stored.

  On the other hand, when the program is protected by the content protection information (CPI) in the PMT packet 201, when recording the program, the PMT information in the PMT packet 201 is recorded as shown in FIG. The area is left as it is, and the PID value of the video packet 202 is changed to, for example, 0x1027 like the video packet 2021, the PID value of the audio packet 203 is changed to 0x1032 like the audio packet 2031, and the PCR packet 204 The PID value is modified to 0x1019 as in the PCR packet 2041, and the PID value of the Caption packet 205 is modified to 0x1048 as in the Caption packet 2051. Further, the final recording data is integrated recording data 210 as shown in FIG. 4C, and is composed of a series of packet data as shown in FIG. 4B. Main body TS data 211 and in-object management data 208 are stored.

  Here, in the intra-object management data 208, in the area 209 for setting the PID value of each packet, the PID value after modification (PID of the Video packet = 0x1027, Audio packet, as shown in FIG. 4B). PID = 0x1032, PCR packet PID = 0x1019, Caption packet PID = 0x1048). Note that the specific area in FIG. 3 is the PID value setting area 209.

  Thus, even if the main body TS data 211 is in a single form, normal reproduction processing is performed, for example, by performing TS packet filtering based on the PID value of each packet stored in the PMT information area in the PMT packet 201. In the reproduction process, the program (video, audio, subtitle) cannot be reproduced.

  Further, the main body information of the program recorded by the method of the present embodiment may be reproducible in a regular device that appropriately manages the combination with the in-object management data 208 in accordance with a predetermined standard. When reproduction processing is performed by a legitimate device, the in-object management data 208 is read out to a control device configured by a CPU or the like, and the modified PID value such as Video packet data is read from the PID value setting information in the in-object management data 208 Is acquired and playback processing is performed.

  FIG. 5 is a diagram illustrating an example of a state in which various types of packets are arranged when there is no content protection setting. In this figure, the main body TS data 212 is composed of a series of individual TS packets. Further, the arrangement order of various types of TS packets is an example, and the multiplexing order and insertion order may be different.

  Each TS packet can be identified as to what kind of packet it is based on the setting value of the PID area 220 in the packet data. The table information for classifying the PID values is described in the in-packet data area 221 of the PMT packet 213. In the example of FIG. 5A, the PID of the Video packet = 0x0270, the PID of the Audio packet = 0x0320, and the PCR ( PID = 0x0190 of Program Clock Reference) packet and PID = 0x0480 of Cap (Caption) packet are set.

  In addition, the PID area 220 of the actual Video packet 215 is 0x0270, the PID area 220 of the actual Audio packet 217 is 0x0320, the PID area 220 of the actual PCR packet 214 is 0x0190, and the PID area 220 of the actual CAP packet 218 is Is set to 0x0480, and is in a state where each packet type can be accurately determined by matching with the information content of the PMT packet 213.

  Here, if the protection setting is not made for the program, the PID value setting information is set as the PID value setting information, and the PID value of each packet in the in-object management data 223 of FIG. 5B is set. The recording process is achieved by placing the image in the area 222 to be recorded.

  FIG. 6 is a diagram showing an example of a state in which various types of actual packets are arranged when there is a content protection setting. In this figure, the arrangement order of various TS packets is an example, and the multiplexing and insertion order may be different.

  When the protection setting is made for the content, the PID value of the predetermined packet data is modified from the state of the main body TS data 212 in FIG. 5A to obtain the main body TS data 240 in FIG. This is achieved by recording the data together with the in-object management data 232 shown in FIG.

  That is, 0x1027 in the PID area 220 of the actual Video packet 226, 0x0320 in the PID area 220 of the actual Audio packet 227, 0x1019 in the PID area 230 of the actual PCR packet 225, and PID area 230 of the actual Cap packet 228. Is set to 0x1048, and it can be discriminated from the contents of the information in the PMT packet 224, so that each packet type can be accurately identified even if the normal TS data playback mechanism is used with only the TS data 223 in the main body. It cannot be played back and cannot be played back.

  Then, instead of the original PID value, the setting value information corresponding to the PID value for each modified packet type is used, and the PID value of each packet in the in-object management data 232 of FIG. The recording process is achieved by placing the image in the area 233 to be set.

  In regular processing conforming to a predetermined standard, the PID value such as Video packet data is acquired by referring to the intra-object management data 232, so that it can be reproduced without any problem.

  This can provide additional protection in content protection.

  FIG. 7 is a diagram showing a device configuration example of a mobile phone.

  Control unit 101 that controls the entire mobile phone, operation unit 102 that receives instructions from the user, broadcast antenna 103 and broadcast channel selection unit 104 for receiving and selecting digital broadcasts, operation programs of the control unit 101 and received Decoded by storage unit 105 for storing digital broadcast data, communication antenna 106 and communication unit 107 for receiving wireless data communication, video decoding unit 108 for decoding compressed video data, and video decoding unit 108 Display unit 109 for displaying video, audio decoding unit 110 for decoding compressed audio data, audio output unit 111 for outputting audio decoded by audio decoding unit 110, and received digital broadcast data on an external recording medium It is composed of a media recording control unit 112 that controls when recording.

  The control unit 101 is configured by a control device such as a CPU, for example. The storage unit 105 is configured by a storage device such as a memory, for example. The video decoding unit 108 is configured by a control device such as an ASIC or FPGA, for example. The display unit 109 is configured by a display device such as a liquid crystal display or an organic EL display, for example. The speech decoding unit 110 is configured by a dedicated circuit such as an ASIC, for example. The audio output unit 111 is configured with, for example, a speaker. The media recording control unit 112 may be configured as a module part of the control unit 101, or may be configured by a dedicated MPU or the like.

  Further, a PID value modification designation packet determination unit 113 and a packet PID value modification processing unit 114 are included as processing module parts inside the control unit 101.

  The broadcast wave signal is received by the control unit 101 under the control of the control unit 101 as digital data via the broadcast antenna 103 and the broadcast channel selection unit 104 and temporarily stored in the storage unit 105. The temporarily stored digital data is separated into compressed video data and compressed audio data under the control of the control unit 101. The separated compressed video data is decoded by the video decoding unit 108 and displayed on the display unit 109. The separated compressed audio data is decoded by the audio decoding unit 110 and output as audio by the audio output unit 111.

  The PMT (Program Map Table) information included in the broadcast wave signal is extracted by the control unit 101 from the digital data acquired via the broadcast antenna 103 and the broadcast channel selection unit 104.

  Further, the control unit 101 extracts copy control information (CPI) from the PMT information, and determines whether or not the content protection is set for the program.

  Further, the PID value modification designation packet determination unit 113 performs the process of step 312. That is, when recording a program for which content protection is set, the packet type to be modified is determined.

  Further, the packet PID value modification processing unit 114 performs the process of step 313. That is, the PID value of the packet whose PID value is to be modified is changed and transmitted. The packet data with the modified PID value is written to the media via the media recording control unit 112.

  As a result, it is possible to rewrite and record the PID value for the packet data of the type specified in advance when recording to the media. Therefore, during reproduction processing, program packet data that cannot be reproduced is generated by default. can do.

  In this embodiment, the target of protection is a digital broadcast program. However, the present invention is not limited to a television program or a radio program, and content such as viewable text, still images, moving images, music, and audio may be protected. . Further, instead of receiving a program as a broadcast signal, a similar method can be used when information of protected content is copied from a recording medium in which the content is recorded in the TS format.

  In the receiving and recording method according to the present embodiment, data that cannot be reproduced even with only TS data alone, and that cannot be reproduced unless a PID value stored in a dedicated data area is referred to. Information video information and audio information), it is possible to make the default reproduction impossible without depending on the control information of a specific format, thereby realizing stronger content protection.

  Conventionally, the PID specified value in the PMT is recorded and held as it is in a predetermined location according to the media standard as received by the transmission / reception, and the corresponding data body is also used as it is without any particular modification. In some cases, the record was held. In this case, the PID value set in the data area provided exclusively for the standard and the actual PID value in the data body match each other, so that the reproducible state can be maintained.

  On the other hand, in this embodiment, the PID value in the data body is falsified, and the PID value write designation value for the PID value setting dedicated area is also changed in a corresponding manner. As a result, when only the data body is separated or taken out, the contents of the PID value table set in the data body and the actual PID value of each packet data are inconsistent, and the reproduction is impossible. can do.

  As a result, it is possible to effectively prevent the distribution of pirated copies by separating only the data body. In addition, since the amount of data to be modified is small compared to a normal encryption process, the process can be lightened.

  In addition, assuming that a malicious person creates pirated version generation software for invalidating the processing in the present embodiment, a great deal of labor and knowledge is required, and it is possible to avoid weeding in terms of cost performance. ,Conceivable.

  The reception recording apparatus according to the present embodiment records in a storage medium according to the content of the protection setting information of the program content determined from the internal information of the broadcast wave signal in a mobile communication terminal having a function of receiving a digital TV broadcast. There is an advantage in function and performance that a stronger and fundamental content protection can be added in a + α manner. As a result, the content protection control information as well as the management of the content protection control information alone corresponds to a protected state, and even if it is applied to an unauthorized player, it cannot be reproduced and protected. Therefore, it can be used for the purpose of protecting the assets and rights of program content providers.

It is the figure which showed an example of the method of discriminating the protection condition of a program. It is the figure which showed an example of the method of modifying the PID value of the packet data to be protected. It is the figure which showed an example of the method of modifying the PID value of the multiple types of packet data to be protected. It is the figure which showed an example of the packet data used as the record object before modification after modification, and the PID value setting area included in it. It is the figure which showed an example of the state in which various kinds of packets were arranged when there was no content protection setting. It is the figure which showed an example of the state in which various kinds of actual packets were arranged in the case where there is a content protection setting. It is the figure which showed the apparatus structural example of the mobile telephone.

Explanation of symbols

301... Performing broadcast reception processing, 302... Performing determination processing as to whether it is PMT information, 304... Performing content protection information (CPI) extraction processing included in PMT information, 305. 306... Stage of performing PID value region modification processing 307... PID value region modification processing step 308. A stage for performing transmission processing for writing packet data including the PID value area to the medium, 208 ... object management data, 209 ... area for setting the PID value of each packet, 210 ... integrated recording data

Claims (12)

Receiving means for receiving content information constituting the content, type information indicating the type of the content information, and protection information indicating whether or not the content is protected;
Recording means for recording content information received by the receiving means and type information indicating the type of the content information;
Control means for controlling each of the components,
When the protection information indicates that the content is protected, the control unit records information different from the received type information in association with the content information instead of the received type information. A receiving and recording apparatus for controlling the recording means.   2. The reception recording apparatus according to claim 1, wherein the content information is video data, audio data, or caption data.   The content information is any one of time information serving as a reference time for reproducing the video data, the audio data, or the subtitle data, the video data, the audio data, or the subtitle data. 2. The reception recording device according to 2.   The reception recording apparatus according to claim 3, wherein the protection information includes information indicating whether the video data, the audio data, the caption data, or the time information is to be protected.   The reception recording apparatus according to claim 1, wherein the reception recording apparatus is a mobile communication terminal.   6. The reception recording apparatus according to claim 1, wherein the reception unit is a broadcast reception unit that receives the content information, the type information, and the protection information by a broadcast signal. Receiving means for receiving content information constituting the content, type information indicating the type of the content information, and protection information indicating whether or not the content is protected;
Recording means for recording the content information received by the receiving means and type information indicating the type of the content information;
Control means for controlling each of the components,
The control means controls the recording means to record the received type information by changing to a different value when the protection information indicates that the content is protected. apparatus. Receiving means for receiving a TS packet including video PES or subtitle PES or audio PES or PCR and PID, and protection information indicating the presence or absence of protection;
Recording means for recording packets received by the receiving means;
Control means for controlling each of the components,
When the protection information indicates that the broadcast signal is protected, the control means controls to record the PID included in the TS packet in the recording means instead of a different value. Receiving recording device. A PMT packet including designation information for designating the PID of a TS packet constituting the content, a TS packet including a video PES, a caption PES, an audio PES, a PCR, and a PID, and protection information indicating the presence or absence of protection are received. Receiving means;
Recording means for recording packets received by the receiving means;
Control means for controlling each of the components,
When the protection information indicates that the broadcast signal is protected, the control means records the PID value included in the TS packet by changing it to a value different from the value specified by the specification information. A receiving and recording apparatus for controlling the recording means.   The reception recording apparatus according to claim 9, wherein the control unit controls the recording unit to record the different values in a dedicated area. Receiving a broadcast signal including data constituting content, type information indicating a type of the data, and protection information indicating whether the content is protected;
Recording data and type information received by the receiving means;
And recording the recorded information in the recording means by changing the type information to information different from the received type information when the protection information indicates that the broadcast signal is protected. Recording method. In a reception and recording method for recording video data, audio data, or digital broadcast program data including video data and audio data,
When content protection information included in the digital broadcast program data is acquired and analyzed, and it is determined that the content protection information indicates a protection setting, when recording the digital broadcast program data,
For the packet data constituting the digital broadcast program data, a packet ID (PID) value indicating the type of the packet data is changed to a different value in the packet data, and the packet data is recorded on a recording medium. A reception recording method characterized by recording a message.

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