JP2006222590A - Information processing apparatus and data moving method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an information processor capable of acquiring moving picture data of original high picture quality again even when digital moving picture data of high quality which can not be duplicated are converted into digital moving picture data of low quality. <P>SOLUTION: A digital video recording device 101 which receives digital moving picture data including copy control information and performs information processing for the received moving picture data is provided with a means of converting the input digital moving picture data into digital moving picture data of low quality to output the data, a means of generating backup data having the quality of the moving picture data before the conversion and storing the generated backup data as unreproducible data when the copy control information indicates that duplication is inhibited, and a means of reproducing the backup data stored as the unreproducible data into moving picture data having quality similar to the quality before the conversion. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a technology of an information processing apparatus having a function of preventing illegal copying of digital data.

  In recent years, HDD recorders that record television broadcast programs on a hard disk drive (hereinafter referred to as “HDD”) have become widespread. When recording an analog terrestrial broadcast, the HDD recorder A / D converts the output from the tuner into digital image / audio data, and this data is converted into MPEG (Motion Picture Experts Group), which is an international standard video coding system. Encode and convert to digital video data. Then, the HDD recorder stores the converted digital moving image data in the HDD. The HDD recorder is generally provided with a DVD recorder function capable of recording a moving image on a DVD disk, and digital moving image data recorded on the HDD can be copied to the DVD disk.

  Currently, digital satellite broadcasting and digital terrestrial broadcasting have been started as alternatives to analog terrestrial broadcasting. In these broadcasts, digital moving image data is directly distributed, and the HDD recorder can store the distributed digital moving image data directly in the HDD for recording. However, in the case of digital broadcasting, digital copy control information is included in the distributed digital moving image data, and the HDD recorder can limit the copy function according to the copy control information added for each content.

  There are three types of copy control information: “Never copy”, “Copy one generation only”, and “Copy free without constraint”. If the digital copy control information is “copy prohibited”, recording to the HDD is not possible. When the digital copy control information is “Copyable without constraint”, recording can be performed on the HDD, and further, copying can be performed on the DVD disk. Further, when the digital copy control information is “copyable only for one generation”, recording can be performed only once on the HDD, and in this case, the copy control information changes to “No more copies”. The moving image data that cannot be copied cannot be copied to a DVD disk. However, moving image data can be moved to a rewritable DVD disc that supports copy control technology such as CPRM (Content Protection for Recordable Media). In this case, the moving image data in the HDD is deleted after the movement.

  These moving image data copy controls are also applied when moving moving image data from the HDD recorder to another device. There is DTCP (Digital Transmission Content Protection) as a copy control technique through transmission of IEEE 1394 or a network. Also in this DTCP, copy control is realized with the same digital copy control information.

  2. Description of the Related Art Conventionally, a recording apparatus that moves digital video data that cannot be copied is known (for example, Patent Document 1). According to Patent Document 1, when moving digital video data that cannot be copied to another device, the recorded video data to be moved is divided into packets, transmitted to other devices on a packet-by-packet basis, and corresponds to a packet for which transmission has been completed. The part is deleted.

  On the other hand, some HDD recorders in recent years have a function of converting digital moving image data into other formats of low resolution. For example, the HDD recorder can record digital moving image data distributed in high definition (HD: High Definition 1 frame is 1920 × 1080 pixels or less, simply referred to as “HD”) by digital broadcasting. When this digital moving image data is moved to a rewritable DVD disc, transcoding for converting the format of the moving image data is required. This is because moving image data that can be stored on a rewritable DVD disc is compatible only with standard definition (SD: Standard Definition 1 frame is 720 × 480 pixels or less, simply referred to as “SD”). Therefore, the HD quality digital moving image data is converted to SD quality digital moving image data and then moved to a rewritable DVD disc.

  Also, some HDD recorders can convert recorded digital video data into a data format that can be displayed on a mobile phone. Since the screen size of digital moving image data that can be displayed on a mobile phone is about QCIF (176 × 144 pixels), it is necessary to convert from HD quality to QCIF size data in this case as well. The converted data is stored in a flash memory such as an SD card, and the digital moving image data can be reproduced by inserting the flash memory into a mobile phone.

  A recording apparatus that down-converts HD quality moving image data to SD quality is described in Patent Document 2, for example.

JP 2002-314924 A JP 2003-234999 A

  By the way, in digital terrestrial broadcasting, most programs are created with HD resolution and copy control is distributed as “Copy one generation”. Therefore, the HD quality digital moving image data recorded on the HDD from the digital terrestrial broadcast is copy-controlled with “No more copies”.

  However, the techniques described in Patent Documents 1 and 2 have the following problems. For example, in the techniques of Patent Documents 1 and 2, after recording HD quality digital moving image data distributed as “copyable for only one generation” on the HDD, the digital moving image data is down-converted to SD quality or the like. When moving to a rewritable DVD disc or the like, the HD quality digital moving image data is deleted. For this reason, even if the digital moving image data moved to the rewritable DVD disk or the like is moved again to the HDD of the HDD recorder, the SD quality remains as it is and HD quality digital moving image data cannot be obtained again. Note that when HD-quality digital moving image data is converted into data for a mobile phone, there is a problem that only moving image data having a quality lower than SD quality remains and is not suitable for viewing on a television monitor.

  Also, for example, in an HDD recorder, considering the memory capacity and the like, the HD quality digital video data recorded with “No more copies” is converted into video data with a quality lower than the HD quality and stored. There is something I want to keep. In this case as well, since the HD quality digital moving image data is deleted when converting to low quality moving image data, the same problem as described above occurs.

  The present invention has been made in view of the above circumstances, and the object of the present invention is to re-create the original even when the digital video data that cannot be copied is converted into digital video data having a quality lower than the quality of the video data. An object of the present invention is to provide an information processing apparatus capable of obtaining quality moving image data.

  In order to solve the above problems, one embodiment of the present invention is applied to an information processing device that receives input of moving image data encoded in an arbitrary encoding format and performs processing on the received moving image data. Here, the moving image data includes information for controlling copying of the moving image data, and at least copy control information indicating whether copying is not possible.

  The information processing apparatus converts the received moving image data into moving image data having a quality different from that of the received moving image data and outputs the copy control information included in the received moving image data. Backup data having the quality of the video data before the conversion, when the conversion means converts the received video data into low-quality video data compared to the quality of the received video data. Backup correspondence means that associates the backup data with backup creation means for storing the created backup data as non-reproducible data, identification information for identifying the converted video data output by the conversion means, and the backup data Means for creating information, and the backup creation means comprises the stored backup from a user. Video data output by the conversion means corresponding to the stored backup data using the stored backup data, the video data output by the conversion means, and the backup correspondence information. Is specified, the specified moving image data is deleted, and the stored backup data corresponding to the deleted moving image data is converted into reproducible data.

  According to the present invention, when moving image data that is copy-prohibited and copy-controlled is converted to lower-quality moving image data, the backup data having the quality of the moving image data before the conversion is created, and the backup data is I keep it in a non-reproducible state. When the converted low-quality moving image data is deleted, the stored backup data is converted into reproducible data. Therefore, according to the present invention, for example, even when high-quality digital moving image data that cannot be copied is converted into low-quality moving image data, original high-quality moving image data can be obtained again.

A digital recording apparatus to which an embodiment of the present invention is applied will be described below with reference to the drawings. In addition, embodiment shown below is an example for implement | achieving this invention, and is not necessarily limited to this embodiment.
<< First Embodiment >>
First, a first embodiment of the present invention will be described.

  FIG. 1 is a block diagram showing the configuration of the digital recording apparatus according to the first embodiment of the present invention. The digital recording apparatus shown in the figure has a built-in tuner for receiving digital broadcasting by satellite or terrestrial waves.

  The digital recording apparatus 101 includes a tuner 103, a stream acquisition unit 104, a transcoding unit 105, an encryption processing unit 106, a key generation unit 107, a reproduction unit 108, a display unit 109, a moving image data storage unit 112, a moving image data information management unit 113, An input unit 114, a control unit 115, a media connection unit 116, a backup creation unit 121, and a bus 120 are included. The tuner 103 is connected to a TV antenna 102 that receives a digital broadcast signal. A speaker 110 is connected to the playback unit 108. A monitor 111 is connected to the display unit.

  The digital broadcast signal includes information for identifying the program, copy control information, quality information indicating the quality of the program image, and content format information indicating the video data fort (for example, MPEG-2TS). It shall be assumed. In the following explanation, the copy control information included in the digital broadcast at the time of broadcasting is “Never copy” for prohibiting program duplication, “Copying only one generation is permitted” Copy one generation) ”and“ Copy free ”that allows unlimited copying of programs are taken as an example. A program whose digital copy control information can be copied only for one generation can be recorded only once in a storage device such as an HDD. more copies) ”.

  The tuner 103 receives a digital broadcast signal via the TV antenna 102, demodulates and selects the received digital broadcast signal, and acquires digital moving image data (for example, MPEG-2TS data).

  The stream acquisition unit 104 acquires the stream of the program to be recorded from the MPEG-2TS data acquired by the tuner 103, and releases the encryption applied at the time of broadcasting. The transcoding unit 105 performs processing such as moving image data format conversion and quality conversion.

  The encryption processing unit 106 performs encryption / decryption processing of moving image data. The key generation unit 107 generates an encryption key for encryption and decryption used for encryption. The playback unit 108 decodes and plays back the moving image data. The sound reproduced by the reproduction unit 108 is output from the speaker 110. The display unit 109 generates screen image information such as moving image data and a menu screen, and transmits the generated image information to the monitor 111. The monitor 111 receives the image information from the display unit 109 and displays the image information on the screen.

  The moving image data storage unit 112 is a storage device that stores moving image data. For example, an HDD or the like can be used. The moving image data information management unit 113 generates information for managing the moving image data stored in the moving image data storage unit 112, and stores the generated information. Specifically, the moving image data information management unit 113 generates a moving image data management table (see FIG. 3), which will be described later, and stores the generated moving image data management table in a memory (not shown). Note that the function of the moving image data information management unit 113 may also serve as a department that can store data, such as the moving image data storage unit 112.

  The input unit 114 receives various requests from the user. For example, a remote controller for the user to control the digital recording device 101 can be used as the input unit 114. Further, for example, the function of the input unit 114 may be realized by a button or switch provided in the digital recording device 101.

  The media connection unit 116 controls input / output of data to / from the media 117 inserted into the digital recording device 101. The medium 117 is a medium capable of storing moving image data, such as a rewritable DVD disk or flash memory, and this medium 117 securely holds a data storage unit 119 for storing moving image data and an encryption key to be described later. And a key storage unit 118. The bus 120 connects each part. Control data and moving image data are transferred via the bus 120. The backup creation unit 121 creates backup data of moving image data.

  The control unit 115 controls the operation of the entire digital recording apparatus 101. Specifically, the control unit 115 receives input of various instructions to the digital recording apparatus 101 via the input unit 114, and controls the digital recording apparatus 101 to perform an operation corresponding to the received instruction. For example, when receiving an instruction to record a broadcast program via the input unit 114, the control unit 115 controls the tuner 103, the stream acquisition unit 104, the encryption processing unit 105, the key generation unit 107, and the like. The moving image data of the program instructed to be recorded is stored in the moving image data storage unit 112.

  In the present embodiment, the configuration for realizing the functions of the above-described units is not particularly limited. For example, the stream acquisition unit 104, the transcoding unit 105, the playback unit 108, and the display unit 109 are each realized by a dedicated circuit that performs the above-described processing.

  Further, for example, the functions of the encryption processing unit 106, the key generation unit 107, the moving image data information management unit 113, the input unit 114, the control unit 115, the media connection unit 116, and the backup creation unit 121 can be realized by software. . Specifically, the digital recording device 101 includes a CPU (not shown), a main storage device (not shown), and an auxiliary storage device (not shown). The auxiliary storage device includes the functions of the above-described units (encryption processing unit 106, key generation unit 107, moving image data information management unit 113, input unit 114, control unit 115, media connection unit 116, and backup creation unit 121). A program for realizing the above is stored. The function of each of the above units (encryption processing unit 106, key generation unit 107, moving image data information management unit 113, input unit 114, control unit 115, media connection unit 116, and backup creation unit 121) is auxiliary stored by the CPU. This is realized by loading a program stored in the apparatus into the main storage device and executing it.

  Hereinafter, the flow of processing will be described in order with reference to FIG.

  First, the video data recording process will be described. In the following description, MPEG-2 (Motion Picture Expoerts Group Phase 2) and MPEG-4 (Motion Picture Expoerts Group Phase 4), which are international standards, are mainly used as moving image data encoding methods.

  First, the user first inputs a recording instruction for moving image data of digital broadcasting via the input unit 114. The recording instruction includes information for specifying a program to be recorded (for example, program name, broadcast start time, channel, etc.). Receiving the recording instruction via the input unit 114, the digital recording apparatus 101 demodulates the digital broadcast signal received from the TV antenna 102 by the tuner 103, converts it to an MPEG2-TS stream, and converts the converted MPEG2-TS stream. The stream is sent to the stream acquisition unit 104.

  The stream acquisition unit 104 acquires program information from the MPEG2-TS stream. The stream acquisition unit 104 extracts only the MPEG2-TS stream of the program to be recorded using the information specifying the program to be recorded included in the recording instruction received by the input unit 114, and the stream acquired at the time of broadcasting is extracted. The encryption is released and the processed stream is sent to the encryption processing unit 106. The stream acquisition unit 104 acquires copy control information and content format information from the program information separately extracted from the stream during this processing, and sends it to the video data information management unit 113. If the copy control information is “Copy one generation”, the stream acquisition unit 104 changes the copy control information to “No more copies”, and the changed copy control information is moved to the video data information management unit. 113.

  The encryption processing unit 106 uses the local encryption key automatically generated by the key generation unit 107 to locally encrypt the transmitted stream. Local encryption is encryption that is effective only within the digital recording apparatus 101, and is intended to prevent reproduction, for example, even if moving image data is illegally extracted from this apparatus. The locally encrypted stream is stored in the moving image data storage unit 112 as moving image data. The local encryption key used for local encryption is sent to the moving image data information management unit 113.

  The moving image data stored in the moving image data storage unit 112 is stored in the format of MPEG-2TS for the system layer, MPEG-2 Video for the video, MPEG-2AAC, or MPEG-2Audio for the audio when the digital broadcast is recorded. It is common to be done. The system layer MPEG-2TS may be recorded after being converted to MPEG-2PS. In the case of digital broadcasting, since most moving image data is broadcast in HD quality, the recorded moving image data also has HD quality. However, in order to save the capacity of the moving image data storage unit 112, the HD quality moving image data may be recorded after being down-converted to SD quality. These conversions can be realized by performing the conversion via the transcoding unit 105 when the stream acquisition unit 104 sends the stream to the encryption processing unit 106. The detailed operation of the transcoding unit 105 will be described later. Even when these conversions are performed, the copy control information for each moving image data does not change.

  In the moving image data information management unit 113, for example, a moving image data management information table 307 as shown in FIG. 3 is created and stored based on the sent information. FIG. 3 is a diagram schematically illustrating the data configuration of the moving image data management information table 307 according to the first embodiment.

  As shown in the figure, the moving image data management information table 307 includes a field 301 for registering a recording information ID for identifying recorded moving image data, a field 302 for registering a recording time, and a title (program name) of the moving image data. ), A field 304 for registering the format and quality of the recorded moving image data, a field 305 for registering copy control information, and the local used when the moving image data is encrypted. One record is composed of a field 306 for registering an encryption key.

  The moving image data information management unit 113 generates a “recording information ID” for uniquely identifying moving image data to be recorded, and assigns a “recording information ID” to each moving image data to be recorded. Further, the moving image data information management unit 113 acquires the recording time from a timer (not shown) provided in the digital recording device 101. The title to be registered in the field 303 can be acquired from, for example, an electronic program guide that is periodically sent by a broadcast signal. Then, the moving image data information management unit 113 associates the “recording information ID” assigned to the moving image data with the acquired “recording time” and “title”, the received “content format”, and “copy control”. Information "and" local encryption key "are stored in the corresponding fields.

  The moving image data managed in the moving image data management information table 307 has a one-to-one correspondence with the moving image data stored in the moving image data storage unit 112. Therefore, by referring to the moving image data management information table 307, the corresponding moving image data in the moving image data storage unit 112 can be uniquely accessed. Note that the illustrated moving image data management information table 307 is merely an example. Therefore, the moving image data management information table 307 may have other moving image data information.

  When the user can display reproducible video data on the monitor 111, the display unit 109 uses the video data management information table 307, for example, a menu screen for accepting playback of the video data shown in FIG. Is displayed on the monitor 111.

  FIG. 4 is an example of a display screen showing reproducible moving image data displayed on the monitor 111 by the digital recording apparatus 101 according to the first embodiment of the present invention.

  As shown in the figure, the display screen 401 is provided with an area for displaying a list of “title” and “quality” of reproducible moving image data. The user can check reproducible video data in the video data storage unit 112 by viewing the display screen 401. The illustrated menu screen 401 is merely an example. For example, in addition to “title” and “quality”, other information can be displayed on the menu screen 401. However, the local encryption key stored in the field 305 of the moving image data management information table 307 is not displayed. This is to prevent illegal use of moving image data under copy control.

  The user who has viewed the display screen 401 can select moving image data to be reproduced using the input unit 114 and can start reproduction of the selected moving image data. That is, the digital recording apparatus 101 accepts input of data for selecting moving image data to be reproduced from the user. When the digital recording apparatus 101 accepts input of data for selecting moving image data, the digital recording apparatus 101 transfers the moving image data selected from the moving image data storage unit 112 to the encryption processing unit 106. The encryption processing unit 106 acquires a local encryption key corresponding to the transmitted moving image data from the moving image data management information table 307 of the moving image data information management unit 113, and releases the local encryption of the moving image data. Next, the decrypted video data is transmitted to the playback unit 108. The reproduction unit 108 reproduces the moving image data that has been sent. Specifically, the reproduction unit 108 can reproduce desired moving image data by outputting sound to the speaker 110 and outputting video to the monitor 111 via the display unit 109.

  Next, a processing procedure when moving the moving image data in the moving image data storage unit 112 to the medium 117 inserted in the media connection unit 116 will be described. Generally, the format of moving image data stored in the medium 117 is uniquely determined by the medium. For example, in the case of a rewritable DVD disc, the system layer is MPEG-2PS, the video is MPEG-2Video, the audio is MPEG2-Audio, and the quality is SD quality. When moving to flash media for mobile phones, the system layer is MPEG-4 FileFormat, Video is MPEG-4 Visual, audio is AMR (Adaptive MultiRate), which is a voice coding system, and quality is QCIF size ( 176 × 144 pixels) is common. Therefore, when moving the moving image data in the moving image data storage unit 112 to the medium 117, transcoding is often required.

  In the following, a processing procedure for moving moving image data when the copy control information of moving image data to be moved is “No more copies” and transcoding is necessary will be described with reference to FIG. . When the copy control information of the moving image data to be moved is “Copy free”, the moving image data to be moved is stored in the media 117 in a state where the moving image data is stored in the moving image data storage unit 112. Since it is sufficient to copy, the following processing steps are not performed.

  FIG. 5 is a diagram for explaining the flow of moving image data movement processing performed by the first embodiment of the present invention. In the following description, it is assumed that the medium 117 is inserted into the media connection unit 116 and the input unit 114 receives an instruction to move moving image data from the moving image data storage unit 112 to the medium 117. In the digital recording apparatus 101, when the moving instruction for moving image data is received, the control unit 115 refers to copy control information of moving image data to be moved. When the copy control information of the moving image data to be moved is “No more copies”, the control unit 115 starts the following processing steps.

  First, the digital recording apparatus 101 checks the format of the media 117 and the moving image data format to be moved in the moving image data storage unit 112, and determines the parameters for transcoding used in the transcoding unit 105 (S501). ), The process proceeds to S502. Specifically, the control unit 115 accesses the moving image data storage unit 112 and detects the format of moving image data to be moved. In addition, the control unit 115 detects the format of the inserted media 117 via the media connection unit 116. Then, the control unit 115 transmits the detected parameter to the transcoding unit 105. The format of the medium 117 is uniquely determined by the medium such as a DVD disk as described above. In addition, when the user can select the format of the media 117, the control unit 115 may accept selection of parameters from the user.

  In step S502, the control unit 115 causes the key generation unit 107 to perform encryption key generation processing for encrypting the converted moving image data. The generation of the encryption key follows the encryption method used when storing in the medium 117. Note that the encryption format is often determined depending on the type of the medium 117. For example, when the medium 117 is a rewritable DVD disk or flash memory, information specific to the medium is stored in the key storage unit 118, and an encryption key is generally generated from the information.

  Next, the control unit 115 determines whether to create backup data (S503). Specifically, the control unit 115 determines to create backup data when moving target moving image data is converted into moving image data having a quality lower than that of the moving image data. The control unit 115 determines whether to convert the moving image data to a quality lower than that of the moving target moving image data based on the parameter acquired in S502. On the other hand, the control unit 115 determines that the backup data is not created when the moving image data to be moved is not converted into moving image data having a quality lower than that of the moving image data.

  In step S503, when the moving target moving image data is converted into moving image data having a quality lower than that of the moving image data, the control unit 115 inquires of the user whether or not to create a backup. You may make it determine by selection. When performing selection by the user, for example, the control unit 115 displays a selection screen 601 as shown in FIG. 6 on the monitor 111 and selects whether to create a backup via the input device unit 114. Let In addition, a mode is provided by default, and it may be determined whether to create backup data according to the mode. If the control unit 105 determines not to create a backup, the control unit 105 proceeds to the process of S520. On the other hand, if the control unit 115 determines to create a backup, the control unit 115 requests the key generation unit 107 to create a local key, and the process proceeds to S504.

  In step S504, the key generation unit 107 generates a local encryption key used for local encryption processing. This local encryption key is used to encrypt the backup data of the moving image data. Note that the local encryption key method is not particularly limited, but in the following description, a case where a shared key encryption method using the same key for encryption and decryption is used is taken as an example. For example, the encryption processing unit 106 creates an encryption key by DES (Data Encryption Standard) or Triple-DES.

  Subsequently, the control unit 115 identifies moving image data designated for movement from the moving image data stored in the moving image data storage unit 112, and transmits the identified moving image data to the encryption processing unit 106 via the bus 120. To do. When receiving the moving image data from the moving image data storage unit 112, the encryption processing unit 106 acquires a local encryption key corresponding to the moving image data received from the moving image data information management unit 113, and releases the encryption of the moving image data. The encryption processing unit 106 transmits the decrypted moving image data to the transcoding unit 105 (S505). Note that the encryption processing unit 106 holds the decrypted moving image data and uses it for the backup processing in S507 described later.

  In step S505, the control unit 115 does not send moving image data to be moved from the moving image data storage unit 112 to the encryption processing unit 106 at a time, but sends them in a predetermined processing unit. There is no particular limitation on how to separate the processing units. For example, the moving image data may be transmitted after being delimited every predetermined time (for example, 90 seconds). Further, for example, the moving image data may be transmitted after being delimited by a certain number of bytes. The processing from S505 to S510 shown below is performed for each moving image data divided into predetermined processing units. The processing from S505 to S510 is repeated until all the processing of moving image data to be moved is completed. Thus, the reason why the delimited moving image data is processed in a predetermined processing unit is to prevent two or more moving image data of “No more copies” from being present in a reproducible state.

  Next, the transcoding unit 105 receives the video data divided by the predetermined processing unit that has been decrypted and transmitted from the cryptographic processing unit 106, transcodes the video data (step 506), and transcodes the video. Data is transmitted to the encryption processing unit 106. Here, the operation of the transcoding unit 105 will be described in detail with reference to FIG.

  FIG. 2 is a functional block diagram of the transcoding unit 105 of the present embodiment. As illustrated, the transcoding unit 105 includes an interface unit 201, an AV separation unit 202, a video decoding unit 203, a video scaling unit 204, a video encoding unit 205, an audio decoding unit 206, an audio scaling unit 207, and an audio code. A conversion unit 208 and an AV multiplexing unit 209.

  The interface unit 201 performs data input / output processing with each unit in the digital recording apparatus 101. For example, the interface unit 201 receives moving image data transmitted from the cryptographic processing unit 106. The AV separation unit 202 accepts input of moving image data received by the interface unit 201. The AV separation unit 202 separates the system layer of the received moving image data into audio data encoded by DEMUX and encoded video data. The AV separation unit 202 transmits the separated encoded video data to the video decoding unit 203, and transmits the separated encoded audio data to the audio decoding unit 206.

  The video decoding unit 203 receives the encoded video data transmitted from the AV separation unit 202, decodes the encoded video data, and transmits the decoded video data to the video scaling unit 204. The video scaling unit 204 receives the decoded video data transmitted from the video decoding unit 203, converts (scaling) the frame size and frame rate of the decoded video data, and encodes the converted video data into a video encoding The data is output to the unit 205. The video encoding unit 205 performs a process of re-encoding the video data after scaling, and outputs the re-encoded video data to the AV multiplexing unit 209.

  In addition, the audio decoding unit 206 receives the encoded audio data transmitted from the AV separation unit 202, decodes the received encoded audio data, and transmits the decoded audio data to the audio scaling unit 207. The audio scaling unit 207 accepts the decoded audio data transmitted from the audio decoding unit 206. The audio scaling unit 207 performs scaling processing for converting the number of channels of the received decoded audio data or converting the sampling frequency, and outputs the converted audio data to the audio encoding unit 208. The audio encoding unit 208 re-encodes the audio data after scaling, and outputs the re-encoded audio data to the AV multiplexing unit 209.

  The AV multiplexing unit 209 receives input of re-encoded video data output from the Video encoding unit 205 and re-encoded audio data output from the Audio encoding unit 208. Then, the AV multiplexing unit 209 MUXes the received re-encoded video data and re-encoded audio data into one moving image data. The AV multiplexing unit 209 transmits one moving image data to the interface unit 201.

  Here, processing performed by the transcoding unit 105 will be described by taking as an example a case where the original moving image data is HD quality MPEG-2TS and the format stored in the medium 117 is a format for mobile phones.

  In this case, the AV separation unit 202 DEMUXs the MPEG-2TS system layer and outputs video data in the MPEG-2 Video format and audio data in the MPEG-2 AAC format, for example. Then, the video decoding unit 203 decodes the MPEG-2 Video, and the video scaling unit 204 converts the HD quality (eg, 1920 × 1080 pixels, 30 fps, interlaced) video data to a quality for mobile phones (eg, 176 × 144 pixels, 15 fps, progressive) video data. Thereafter, the video encoding unit 205 performs encoding with MPEG-4 Visual. The audio decoding unit 206 decodes MPEG-2 AAC audio data, and the audio scaling unit 207 uses the decoded audio data (for example, sampling frequency 48 KHz, channel number 5.1 ch, etc.) for mobile phone audio. It is converted into data (for example, sampling frequency 8 KHz, number of channels 1 ch). Thereafter, the audio encoding unit 208 encodes the audio data for the mobile phone with AMR. Then, the AV multiplexing unit 209 MUXs the encoded video data and the encoded audio data with the MPEG-4 FileFormat and converts it into one moving image data.

  For example, when the video data or audio data before and after conversion are the same, it is not necessary to convert them. In that case, the video or audio data output from the AV separation unit 202 can be directly sent to the AV multiplexing unit 209 without being converted. Thereby, it is also possible to convert only the system layer.

  The transcoding unit 105 sends the converted moving image data to the encryption processing unit 106. In the processing of S506 performed by the transcoding unit 105, unique identification information, for example, an ID is generated in the converted moving image data in order to identify the moving image data. This ID shall be handled simultaneously with the converted low-quality moving image data. For example, at least one unique ID may be stored in the user area of the moving image data, or may be derived from a part of the low quality moving image data, for example. Further, the unique ID may be the local encryption key generated in S504 described above. In addition, other information such as a title and a recording time may be used. Using this ID, it is possible to identify the unique moving image data.

  Returning to FIG. In step S507, the control unit 115 causes the encryption processing unit 106 to create backup data of the moving image data before conversion after transcoding is completed. Specifically, the encryption processing unit 106 acquires the local encryption key generated in S504 from the key generation unit 107. In step S <b> 505, the cryptographic processing unit 106 re-encrypts the moving image data divided into predetermined processing units that have been decrypted using the acquired local encryption key. The encryption processing unit 106 transmits the re-encrypted data to the backup creation unit 121.

  Next, the backup creation unit 121 receives the re-encrypted data transmitted by the encryption processing unit 106. The backup creation unit 121 uses the received re-encrypted data as backup data, is divided in units of processing of the same moving image data in the moving image data storage unit 112, and overwrites the corresponding data portion (S508). Thereby, at the end of conversion, the moving image data before conversion is completely deleted, and the newly encrypted moving image data remains as backup data.

  Next, the control unit 115 causes the encryption processing unit 106 to perform processing for encrypting the converted moving image data. Specifically, the encryption processing unit 106 acquires the moving image data converted from the transcoding unit 105, encrypts the converted moving image data using the encryption key generated in S502 (S509), and performs the processing of S510. move on.

  In S510, the encryption processing unit 106 sends the encrypted moving image data to the data storage unit 119 of the media 117 via the media connection unit 116 (S510). The encryption processing unit 196 stores the encryption key used for encryption in S509 in the key storage unit 118 of the medium 117.

  The processes in S505 to S510 are repeated until all moving image data to be moved has been moved (step 511). When this conversion process ends, the moving image data that was the transfer target becomes backup data of the moving image data that has been encrypted with another local encryption key.

  Thereafter, the control unit 115 causes the moving image data information management unit 113 to perform a process of creating a backup correspondence table that associates the backup data with the converted moving image data (S512). Here, FIG. 7 shows an example of the backup correspondence table 705. In the illustrated example, the moving image data of “recording information ID = 1” shown in FIG. 3 is moved.

  As shown in the figure, the backup correspondence table 705 includes a field 701 for registering the unique “ID” inserted into the converted video data in S506, a field 702 for registering the “title” of the video data, One record includes a field 703 for registering the content format of backup data corresponding to the converted moving image data, and a field for registering the local encryption key generated in S504.

  Specifically, the moving image data information management unit 113 acquires “ID” to be registered in the field 701 from the transcoding unit 105. The moving image data information management unit 113 uses information registered in the moving image data management information table 307 for the “title” registered in the field 702 and the “content format” registered in the field 703. In addition, the backup creation unit 121 acquires a “local encryption key” to be registered in the field 704 from the encryption processing unit 106. Then, the moving image data information management unit 113 registers the acquired “ID”, “title”, “content format”, and “local encryption key” in the corresponding fields of the backup correspondence table 705.

  Information other than the information shown in FIG. 7 may be registered in the backup correspondence table 705. For example, information for identifying backup data (information such as recording date and time) may be registered together with “title”. Further, the moving image data information management unit 113 may generate identification information for uniquely specifying the backup data, and register it in association with “ID” indicating the converted moving image data registered in the field 701.

  In addition, the moving image data information management unit 113 specifies information indicating moving image data registered in the backup correspondence table 705 from the data registered in the moving image data management information table 307, and deletes the specified information.

  Finally, when the data movement is completed, the control unit 115 stores information on the moved moving image data, such as copy control information and information such as a title, in the moving image data table created in the data storage unit 119 of the medium 117. Store (S513).

  Next, the process of S520 that is performed when it is determined in S503 that a backup is not created will be described. Unless otherwise specified, steps having the same names as those in steps S505 to S511 perform similar processing.

  In S520, similarly to S505, a process of releasing the encryption of the moving image data in the moving image data storage unit 112 is performed. Specifically, the encryption processing unit 106 accepts moving image data designated for movement from the moving image data storage unit 112. The encryption processing unit 106 acquires the corresponding local encryption key from the moving image data information management unit 113, and releases the encryption of the received moving image data using the acquired encryption key. The encryption processing unit 106 transmits the decrypted moving image data to the transcoding unit 105. In S520, unlike the processing in S505, the encryption processing unit 106 does not hold the decrypted moving image data. This is because there is no need to create backup data.

  Subsequently, the transcoding unit 105 receives the decrypted moving image data, performs a transcoding process similar to S506 (S521), and proceeds to the process of S522.

  In S522, the transcoding unit 105 accesses the moving image data storage unit 112 and deletes the portion of the moving image data that has been converted from the stored moving image data (S522).

  Subsequently, the encryption processing unit 106 encrypts the converted moving image data converted by the transcoding unit 105 using the encryption key created in S502 (S523), and the encrypted moving image data is the data of the media 117. The data is sent to the storage unit 119 and stored (S524). The encryption processing unit 106 stores the encryption key used for encryption in the key storage unit 118 of the medium 117.

  The operations from S520 to S524 are continued until the conversion of all the moving image data is completed (S525).

  In the transcoding of S521, it is not necessary to insert a unique ID into the moving image data. Further, in S522, in order to delete the data, for example, the portion where the conversion is completed is overwritten with 0, and when the conversion of all the moving image data is completed, the moving image data is completely deleted from the moving image data storage unit 113. You can erase the data. Further, after the conversion is completed, the information on the moving image data after the conversion is deleted from the moving image data management information table 307.

  Through the above processing, the moving image data stored in the moving image data storage unit 113 can be transcoded and moved in accordance with the format of the media 117. Further, the re-encrypted moving image data can be stored in the moving image data storage unit 113 as backup data. In addition, the moving image data management information table 307 has the moving image data information deleted. The backup data is not displayed in the list of moving image data that can be reproduced by the user as shown in FIG. Therefore, the user cannot reproduce the backup data.

  Also, it is assumed that the backup data stored in the moving image data storage unit 112 can be deleted by the user at an arbitrary timing. For example, when the backup creation unit 121 receives a backup data list display request from the user via the input unit 114, the backup creation unit 121 displays a backup data list screen on the monitor 111. FIG. 8 shows a backup data list screen.

  FIG. 8 is a diagram showing an example of a backup data list screen displayed on the monitor 111 by the digital recording apparatus 101 according to the first embodiment of the present invention.

  As shown in the figure, on the backup data list screen 801, an area for displaying a list of “title” and “quality” of moving image data stored in the moving image data storage unit 112 as backup data, and deletion or reproduction of the backup data. And an area for accepting the selection. The user can check the backup data stored in the moving image data storage unit 112 by looking at the backup data list screen 801. Further, the user can instruct the digital recording apparatus 101 to delete or reproduce the registered backup data.

  When the user selects moving image data and inputs a deletion instruction from the input unit 114, the backup creation unit 121 deletes the backup data from the moving image data storage unit 112 (a process for reproducing the backup data will be described later). .

  After the moving of the moving image data is completed, the moving image data stored in the medium 117 can be reproduced by removing the medium 117 from the medium connecting unit 116 and inserting it into another device. Even in this case, the moving image data in the medium 117 is protected by the copy control and can be moved, but cannot be copied.

  Next, a procedure of processing for returning the backup data of the digital recording apparatus 101 to normal moving image data will be described with reference to FIG. As a condition for performing this processing procedure, the copy control information of the moving image data of the medium 117 is “No more copies”, and a unique ID corresponding to the corresponding backup data is inserted into the moving image data of the medium 117. The backup data corresponding to the moving image data of the medium 117 must exist in the digital recording apparatus 101. Note that the process of reproducing the backup data described below is performed when the digital recording apparatus 101 displays the backup data list screen 801 in FIG. 8 on the monitor 111, for example, and receives a backup data reproduction instruction from the user. Be started.

  FIG. 9 is a diagram for explaining a flow of processing for returning the backup data to normal moving image data performed by the digital recording apparatus according to the first embodiment of the present invention.

  First, when the control unit 115 receives an instruction to reproduce the backup data, the copy control information from the moving image data stored in the medium 117 inserted in the media connection unit 116 is “No more copies”. ”” Is searched (S901). If there is no corresponding moving image data, the reproduction of the backup fails and the process ends. If there is the corresponding moving image data, the process proceeds to S903 (S902).

  In S903, the control unit 115 acquires a unique ID inserted in the corresponding moving image data (S903). Note that the moving image data in the medium 117 is encrypted. For this reason, the control unit 115 controls the encryption processing unit 106 to acquire a unique ID. That is, the encryption processing unit 106 first generates an encryption key for decryption from the information in the key storage unit 118, decrypts the video data using the encryption key, obtains a unique ID, and obtains the unique ID. Is output to the control unit 115. If there is a unique ID in the unencrypted part of the video data, decryption is not necessary. In that case, the control unit 115 acquires a unique ID from the moving image data stored in the medium. Further, when there are a plurality of target moving image data, a unique ID is acquired from the plurality of moving image data.

  Next, the control unit 115 causes the backup creation unit 105 to collate the acquired ID with the backup correspondence table 705. Specifically, the control unit 115 transmits the acquired unique ID to the backup creation unit. The backup creation unit 105 compares the unique ID with the unique ID of the moving image data in the backup correspondence table 705 stored in the moving image data information management unit 113. The backup creation unit 105 proceeds to S905 when there is moving image data that matches the acquired unique ID, and when there is no moving image data that matches the acquired unique ID, reproduction of the backup fails and the processing ends. (S904).

  In S905, the backup creation unit 105 deletes the matched moving image data from the moving image data stored in the medium 117 (S905). The backup creation unit 105 similarly deletes information regarding the deleted moving image data included in the medium 117.

  Next, the control unit 115 causes the key generation unit 107 to generate an encryption key for local encryption (S906). The generated local encryption key is used when re-encrypting the decrypted backup data.

  Next, the control unit 115 specifies a record having a unique ID from the backup correspondence table 705 stored in the moving image data information management unit 113, and decrypts the backup data from the field 704 of the record. A local encryption key is acquired and transmitted to the encryption processing unit 106. Further, the control unit 115 sends the moving image data divided by the processing unit of the backup data stored in the moving image data storage unit 112 to the encryption processing unit 106. Then, the encryption processing unit 106 decrypts the backup data using this local encryption key (S907).

  Next, the encryption processing unit 106 re-encrypts the decrypted moving image data using the new local encryption key created in S906 (S908).

  Next, the re-encrypted moving image data is overwritten on the moving image data divided by the corresponding processing unit of the backup data in the moving image data storage unit 112 (S909).

  The processing from S907 to S909 is continued until the processing is completed for all data of the backup data to be reproduced (S910). At the stage where the processing is completed, the backup data is completely deleted, and reproduced moving image data is obtained instead.

  Finally, the backup creation unit 105 adds the moving image data reproducing the backup data to the moving image data management information table 307 in the moving image data information management unit 113, and deletes the backed up moving image data column in the backup correspondence table 705. . The field 306 of the moving image data management information table 307 contains the local encryption key generated in step 906, and the data registered in the other fields can be supplemented from the backup correspondence table 705. In the field 305, “No copy” is registered as copy control information. In the field 301, a newly assigned “recording information ID” is registered.

  In this embodiment, when creating a backup, the backup data is created by overwriting the original moving image data. However, for example, the backup data may be created separately in a different area. In that case, the data in the area to be overwritten must be overwritten with 0, or the data must be completely erased. Further, after the moving image data is moved, the original moving image data must be completely deleted from the moving image data storage unit 112.

  In the description of the first embodiment described above, the backup data is created by re-encryption. However, the present invention is not particularly limited to this. For example, the same function can be realized even if the original moving image data itself is treated as backup data. In that case, the processing of S507 and S508 in FIG. 9 becomes unnecessary. In this case, the local encryption key 306 of the moving image data management information table 307 is copied to the local encryption key registered in the field 704 of the backup correspondence table 705.

  In addition, in the moving of the moving image data after the conversion in S510, the moving image data after the conversion is temporarily stored in the moving image data storage unit 112 and moved to the medium after the conversion is completed, for example, instead of moving directly to the medium. Good. In that case, the converted moving image data temporarily stored in the moving image data storage unit 112 must be surely deleted.

As described above, according to the first embodiment of the present invention, high-quality moving image data recorded by the copy control of “No more copies” is stored in a medium or viewed on another device. Even if the original high-quality video data cannot be played back by transcoding to the low-quality video data for the purpose, the original high-quality video data can be reproduced by deleting the low-quality video data. Can do. As a result, the portability of the moving image data is improved, so that the usability of the user is improved and the moving image data that can be reproduced at the same time can always be made one.
<< Second Embodiment >>
Subsequently, a second embodiment of the present invention will be described. In the second embodiment, a communication function is added to the digital recording apparatus 101 of the first embodiment, and moving image data is transmitted to another digital recording / playback apparatus via a network.

  FIG. 10 is a block diagram showing the configuration of the moving image data movement system according to the second embodiment of the present invention. In the description of the second embodiment, the same reference numerals are used for the same components as those in the first embodiment. In the description of the second embodiment, the description will focus on parts that are different from the first embodiment.

  As illustrated, the moving image data movement system includes a digital recording device 101 and a digital recording / playback device 1003. The digital recording device 101 and the digital recording / playback device 1003 are connected via a network 1002.

  The digital recording apparatus 101 employs a configuration in which the network IF unit 1001 is added to the configuration of the digital recording apparatus 101 of the first embodiment described above and the media connection unit 116 is omitted. In addition, description of the same structure as 1st Embodiment is abbreviate | omitted here.

  A network interface unit 1001 is connected to the network 1002 and controls input / output of data performed with another device (for example, a digital moving image playback device) via the network 1002.

  The digital moving image playback apparatus 1003 is connected to the network 1002, acquires moving image data stored in the digital recording apparatus 101 via the network 1002, and performs processing for playing back the acquired moving image data.

  Specifically, the digital video playback device 1003 includes a network interface unit 1004 connected to the network 1002, a video data storage unit 1005 for storing video data, copy control information for video data stored in the video data storage unit 1005, Movie data information management unit 1006 holding a management table for managing a local encryption key, a key generation unit 1007 for generating an encryption key, an encryption processing unit 1008 for performing encryption and decryption, and reproduction for reproducing movie data Part 1009. In addition, a monitor 1010 that displays the reproduced video and a speaker 1011 that plays the reproduced audio are connected to the digital moving image reproduction apparatus 1003.

  In the second embodiment, the digital video playback device 1003 stores video data having a copy control attribute of “No more copies” stored in the video data storage unit 112 of the digital recording device 101 via the network 1002. Request to move. In addition, when the digital recording apparatus 101 receives a request from the digital video playback apparatus 1003, or the digital video playback apparatus 1003 receives video data stored in the video data storage unit 112 via the input unit 114 from the user. When the instruction to move to the moving image data storage unit 1005 is received, the received moving image data is transmitted to the digital moving image playback apparatus 1003 via the network IF unit 1001.

  When moving image data is transmitted via the network 1002 as described above, there is a problem that it takes time to move data because the bit rate of the moving image data is high. In particular, when the moving image data is of high quality (for example, HD quality), the data transfer time becomes very long. For example, HD quality moving image data has a bit rate of about 20 Mbps, whereas SD quality moving image data has a bit rate of about 2 to 8 Mbps, and moving image data for mobile phones has a bit rate of about 64 to 384 kbps.

  Therefore, in the second embodiment, the moving image data transmission time is shortened by transcoding moving image data to low quality data and then moving the data. Hereinafter, a process in the case where the moving image data stored in the digital recording apparatus 101 is transcoded and transmitted to the digital recording / reproducing apparatus 1003 via the network 1002 will be described with reference to FIG. 5 described above. Note that, in the following description, the description will focus on parts that are different from the above-described processing of the first embodiment, and description of processing having the same contents as in the first embodiment will be omitted.

  First, in step S501, the control unit 115 checks the format of moving image data to be moved in the moving image data storage unit 112, and determines parameters for transcoding. Note that the format of the moving image data to be converted may be set as a default, or may be designated by the user.

  Next, the process of S502 will be described. In the encryption key generation process performed in S502, the digital moving image playback device 1003 and the digital recording device 101 authenticate via the network 1002, and the key generation unit 107 and the key generation unit 1007 generate the encryption key. . This encryption key is used as encryption for passing data securely over the network 1002. In step S509, the digital recording apparatus 101 performs low-quality moving image data encryption processing using the encryption key.

  In step 510, the encryption processing unit 106 transmits the low-quality moving image data encrypted via the network 1002 to the digital moving image playback device 1003 via the network IF unit 1001.

  In S510, the encryption processing unit 1008 of the digital moving image playback device 1003 receives the low-quality moving image data, and decrypts the encryption using the encryption key generated by the key generation unit 1007 in S502. Further, the key generation unit 1007 separately generates a local encryption key, and re-encrypts the low-quality moving image data decrypted using the encryption key. The re-encrypted moving image data is stored in the moving image data storage unit 1005.

  In the second embodiment, the processes of S505 to S510 are repeated until all moving image data to be moved is moved to the digital moving image playback apparatus 1003.

  The moving image data information management unit 1006 creates a moving image data management information table 307 having the same configuration as that in FIG. 3 and manages moving image data stored in the moving image data information management unit 1005. Specifically, the moving image data information managing unit 1006 associates the moving image data with the “recording information ID”, “recording time”, and “content format” of the moved moving image data when the moving image data has been moved. The local encryption key generated by 1007 and the copy control information indicating “No more copies” are registered in the moving image data management information table 307.

  By doing so, the transcoded low-quality moving image data can be transferred from the digital recording device 101 to the digital moving image playback device 1003 via the network 1002 and backup data can be created in the digital recording device 101. Also, in the digital moving image playback device 1003, the moving image data sent from the digital recording device 101 is decrypted by the encryption processing unit 1008, the moving image data is played back by the playback unit 1009, the video is displayed on the monitor 1010, and the speaker 1011. The audio can be reproduced respectively.

  Next, a process for restoring the backup data of the digital recording apparatus 101 will be described with reference to FIG. 9 described above. In the following description, the description of the same process as in the first embodiment is omitted.

  First, in step S <b> 901, when the control unit 115 of the digital recording apparatus 101 receives a backup data reproduction instruction via the input unit 114, the copy control information indicates “No more copies (No more copies) to the digital recording / reproducing apparatus 1003. It is inquired whether the moving image data “)” is stored in the moving image data storage unit 1005.

  The moving image data information management unit 1006 of the digital recording / playback apparatus 1003 accepts the inquiry via the network IF unit 1004. The moving image data information management unit 1006 searches the moving image data stored in the moving image data storage unit 1005 for moving image data whose copy control information is “No more copies”. The digital recording / playback apparatus 1003 transmits the search result to the digital recording apparatus 101.

  In step S <b> 902, the control unit 115 receives the search result transmitted from the digital recording / playback apparatus 1003 via the network IF unit 1001. When the received search result is data indicating “there is no corresponding moving image data”, the control unit 115 determines that the backup cannot be reproduced and ends the process. On the other hand, when the received search result is data indicating “there is corresponding video data”, the control unit 115 proceeds to the process of S903.

  In step S <b> 903, the control unit 115 acquires the unique ID inserted in the corresponding moving image data from the digital recording / playback apparatus 1003. Specifically, the control unit 115 requests the transmission of the unique ID inserted in the moving image data corresponding to the digital recording / playback apparatus 1003 via the network IF unit 1001. Then, the digital recording / playback apparatus 1003 accepts a unique ID transmission request and transmits the requested corresponding ID to the digital recording apparatus 101. The control unit 115 receives the unique ID transmitted by the digital recording / playback apparatus 1003.

  In S904, the control unit 115 performs the same processing as in the first embodiment described above.

  In step S905, the corresponding moving image data in the moving image data storage unit 1005 of the digital moving image playback device 1003 is deleted. Specifically, the control unit 115 transmits a request to delete the matched moving image data to the digital recording / playback apparatus 1003. The digital recording / playback apparatus 100 receives a request for deleting the matched moving image data, and deletes the corresponding moving image data in the moving image data storage unit 1005. The digital recording / playback apparatus 100 transmits data indicating that the corresponding video data has been deleted to the control unit 115.

  When the control unit 115 receives data indicating that the corresponding moving image data transmitted by the digital moving image playback apparatus 1003 has been deleted, the control unit 115 performs the same processing as in the above-described S906 to 911. As a result, the digital recording device 101 can obtain the restored moving image data.

  The procedure shown in FIG. 9 is also performed when the digital moving image reproducing apparatus 1003 returns the moved low quality moving image data to the digital recording apparatus 101. In this case, since the moving image data is clear, steps 901 and 902 are not necessary.

  The present invention is not limited to the embodiment described above, and various modifications can be made within the scope of the gist of the present invention. In the first embodiment and the second embodiment described above, an example in the case of a digital recording apparatus having a tuner function for receiving a digital broadcast has been shown, but the present invention is not limited to this. An information processing apparatus having a configuration excluding the configuration of the tuner 103 and the stream acquisition unit 104 from the digital recording apparatus 101 of the above-described embodiment may be used. Even in such a case, if the digital moving image data is stored in the moving image data storage unit 112, the same effect as the above embodiment can be obtained.

  In addition, the present invention includes a transcoding unit 105, an encryption processing unit 106, a key generation unit 107, a moving image data information management unit 113, an input unit 114, a control unit 115, and a media connection unit 116 (or network connection unit 1001). You may apply to the information processing apparatus which has. In this case, the information processing apparatus is connected to a storage device having the moving image data storage unit 112. The information processing apparatus is provided with a function for accessing data stored in the moving image data storage unit 112.

  Even with this configuration, moving “No more copies” moving image data stored in the moving image data storage unit 112 to a medium such as a DVD (or moving to another device via a network) ), Even if converted to low-quality moving image data, the original quality moving image data can be reproduced by deleting the moved low-quality moving image data.

It is a block diagram which shows the structure of the digital video recording apparatus of 1st Embodiment of this invention. It is a functional block diagram of the transcoding part 105 of 1st Embodiment of this invention. It is the figure which showed the data structure of the moving image data management information table 307 of 1st Embodiment of this invention in simulation. It is the figure which showed an example of the display screen which showed the list | wrist of the video data which can be reproduced | regenerated which the digital recording device 101 of 1st Embodiment of this invention displays. It is a figure for demonstrating the flow of the moving process of the moving image data which 1st Embodiment of this invention performs. It is the figure which showed an example of the selection screen of backup creation which the digital recording device 101 of 1st Embodiment of this invention displays. It is a figure which shows schematically the data structure of the backup corresponding | compatible table 705 of 1st Embodiment of this invention. It is the figure which showed an example of the list screen of the backup data of 1st Embodiment of this invention. It is a figure for demonstrating the flow of the process which returns the backup data which the digital recording device of 1st Embodiment of this invention returns to normal moving image data. It is a block diagram which shows the structure of the moving image data movement system of 2nd Embodiment of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 101 ... Digital recording apparatus, 102 ... TV antenna, 103 ... Tuner, 104 ... Stream acquisition part, 105 ... Transcoding part, 106 ... Encryption processing part, 107 ... Key generation part, 108 ... Generation part, 109 ... Display part, 110 ... Speaker, 111 ... Monitor, 112 ... Movie data storage unit, 113 ... Movie data information management unit, 114 ... Input device, 115 ... Control unit, 116 ... Media connection unit, 117 ... Media, 118 ... Key storage unit, 119 ... Data storage unit 120 ... Bus 121 ... Backup creation unit 201 ... Interface unit 202 ... AV separation unit 203 ... Video decoding unit 204 ... Video scaling unit 205 ... Video encoding unit 206 ... Audio decoding 207 ... Audio scaling unit 208 ... Audio encoding unit 209 ... Image multiplexing unit, 1001... Network interface unit, 1002... Network, 1003... Digital moving image playback apparatus, 1004... Network interface unit, 1005 ... Movie data storage unit, 1006. ... Encryption processing unit, 1009 ... Generation unit, 1010 ... Monitor, 1011 ... Speaker 1002 ... Network

Claims (7)

An information processing apparatus that accepts input of moving image data encoded in an arbitrary encoding format and performs processing on the received moving image data,
The moving image data includes information for controlling copying of the moving image data, and includes at least copy control information indicating whether copying is not possible.
Conversion means for converting the received moving image data into moving image data having a quality different from the quality of the received moving image data;
The copy control information included in the received moving image data indicates that copying is not possible, and the converting means converts the received moving image data into low-quality moving image data compared to the quality of the received moving image data. Backup data having the quality of the video data before the conversion, and storing the created backup data as unreproducible data;
Means for creating backup correspondence information in which identification information for identifying the converted video data output by the conversion means and the backup data are associated with each other;
The backup creation means includes
An instruction to reproduce the stored backup data from the user is received, and the stored backup data, the moving image data output by the conversion means, and the backup correspondence information are used to correspond to the stored backup data The moving image data output by the converting means is specified, the specified moving image data is deleted, and the stored backup data corresponding to the deleted moving image data is converted into reproducible data. Information processing device. The information processing apparatus according to claim 1,
A display device is connected to the information processing device,
The backup creation means includes
If the copy control information indicates that copying is not possible, and the conversion means converts the received moving image data to low-quality moving image data compared to the received moving image data quality, backup data is created. An image prompting the user to select whether or not to display on the display device,
An information processing apparatus that performs processing for creating backup data when receiving an input of data indicating creation of backup data from a user. The information processing apparatus according to claim 1 or 2,
An encryption key generating means for generating an encryption key;
The backup creation means includes
By encrypting the backup data using the encryption key generated by the encryption key generating means, the backup data is converted into the non-reproducible data,
An information processing apparatus that converts backup data into reproducible data by decrypting the non-reproducible data using the generated encryption key. The information processing apparatus according to any one of claims 1 to 3,
It is configured to be connectable to a storage medium, and has media connection means for performing data input / output processing or deletion processing for the connected storage medium,
The storage medium has an encryption key storage area for storing an encryption key, and a moving image data storage area for storing moving image data,
The encryption key generation means creates an encryption key for the storage medium for encrypting the moving image data converted by the conversion means in accordance with an encryption format determined by the storage medium connected to the connection means, Storing the encryption key for the storage medium in the encryption key storage area via the media connection means,
The converting means encrypts the converted moving picture data using the created encryption key for the storage medium, and stores the encrypted moving picture data in the moving picture data storage area via the media connecting means. An information processing apparatus characterized by the above. The information processing apparatus according to any one of claims 1 to 3,
A network connection means connected to a network and transmitting / receiving data to / from an external device via the network;
The information processing apparatus, wherein the conversion means outputs the converted moving image data to the external apparatus via the network connection means. Video data including audio data and video data, which is connected to a storage device that stores the video data encoded in an arbitrary encoding format, and the video data for the video data stored in the storage device In an information processing apparatus that performs input / output processing or deletion processing,
The moving image data includes information for controlling copying of the moving image data, and includes at least copy control information indicating whether copying is not possible.
A medium connecting means configured to be connectable to a storage medium, and performing data input / output processing or deletion processing on the connected storage medium;
Means for reading moving image data stored in the storage device;
When the digital copy control information included in the read video data is not copyable,
The read moving image data is converted into moving image data having a quality lower than that of the moving image data, and identification information for identifying the converted moving image data is generated. The generated identification information, the converted moving image data, Conversion means for associating and storing in the storage medium via the media connection means,
Create backup data having the quality of the video data before conversion, store the created backup data in the storage device as unreproducible data, and delete the video data before conversion from the storage device Means,
Means for creating backup correspondence information in which identification information for identifying the converted low-quality moving image data and moving image identification information for identifying the backup data are associated with each other;
The backup creation means includes
An instruction to reproduce the backup data stored in the storage device is received, and the identification information associated with the moving image data stored in the storage medium connected to the media connection means and the backup correspondence information Using the video data associated with the backup data from the video data stored in the storage medium,
Deleting the specified moving image data from the moving image data stored in the storage medium via the media connection means, and converting the backup data corresponding to the deleted moving image data into reproducible data; An information processing apparatus characterized by the above. Video data including audio data and video data, which is connected to a storage device that stores the video data encoded in an arbitrary encoding format, and the video data for the video data stored in the storage device A data movement method performed by an information processing apparatus that performs input / output processing or deletion processing,
The moving image data includes information for controlling copying of the moving image data, and includes at least copy control information indicating whether copying is not possible.
The information processing apparatus is configured to be connectable to a storage medium, and is provided with media connection means for performing data input / output processing or deletion processing on the connected storage medium,
The information processing apparatus includes:
Reading the moving image data stored in the storage device;
When the digital copy control information included in the read video data is not copyable,
The read moving image data is converted into moving image data having a quality lower than that of the moving image data, and identification information for identifying the converted moving image data is generated. The generated identification information, the converted moving image data, And storing in the storage medium via the media connection means;
Create backup data having the quality of the video data before conversion, store the created backup data in the storage device as unreproducible data, and delete the video data before conversion from the storage device Steps,
Executing the step of creating backup correspondence information in which identification information for identifying the converted low-quality moving image data and moving image identification information for identifying the backup data are associated;
The backup creation step includes
An instruction to reproduce the backup data stored in the storage device is received, and the identification information associated with the moving image data stored in the storage medium connected to the media connection means and the backup correspondence information Using the video data associated with the backup data from the video data stored in the storage medium,
Deleting the specified moving image data from the moving image data stored in the storage medium via the media connection means, and converting the backup data corresponding to the deleted moving image data into reproducible data; A method for moving data.

Images