JP2008077791A - Content recording/reproducing system - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a content recording/reproducing system which can reproduce a plurality of content data successively without replacing an optical disk even if the system has only one optical disk drive. <P>SOLUTION: The content recording/reproducing system comprises a content data duplicating section 133 for duplicating encrypted data stored in a plurality of optical disks to record them into a hard disk drive 18, a plurality of memory chip slots 12 for reading out decoding keys corresponding to respective content data stored in a plurality of memory chips mounted in the slots, a content data decoding section 138 for successively decoding encrypted content data by successively acquiring the corresponding decoding keys from the memory chip when receiving a reproducing command from the outside to reproduce the plurality of content data selected among the content stored in the hard disk drive 18, and a content data sending section 139 for successively sending out a plurality of decoded content data. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a content recording / playback apparatus for playing back content recorded on an optical disc.

  Conventionally, an optical disc such as a DVD-ROM has been widely used as a medium for recording content data such as video and audio.

  The read-only optical disk represented by this DVD-ROM is a replaceable medium, and the stored content data can be copied to a recording medium such as a hard disk drive in the content recording / reproducing apparatus.

  Therefore, in many optical discs, a technique for restricting copying of stored data is used in order to prevent illegal copying.

  Japanese Patent Application Laid-Open No. 2004-228561 describes a technique related to an apparatus that permits a video signal to be copied only once using digital watermarking.

By adding a technique for restricting copying in this way, it is possible to prevent illegal copying from being repeated.
Japanese Patent Laid-Open No. 2005-354681

  However, if copying is restricted and content data cannot be freely copied to the hard disk drive, a content recording / playback apparatus that has only one optical disk drive will not be able to play the There was a problem that it must be replaced and cannot be played continuously.

  The present invention has been made in view of the above circumstances, and even if only one optical disk drive is incorporated, content data stored in a plurality of optical disks can be continuously reproduced without replacing the optical disk. A content recording / reproducing apparatus is provided.

  In order to achieve the above object, a content recording / reproducing apparatus (10) of the present invention records encrypted content data stored in a plurality of optical discs on a large-capacity recording medium in the apparatus, and this large capacity. A predetermined number of encrypted content data is selected from a plurality of encrypted content data recorded on a recording medium, and the selected predetermined number of encrypted content data is sequentially decrypted and reproduced. An optical disc drive (11) for reading each of the stored encrypted content data, a decryption key corresponding to each of the plurality of encrypted content data, and decrypting the corresponding encrypted content data; Content identification information for specifying the corresponding encrypted content data is stored. A plurality of memory chips, a memory data reading unit (12) for reading the decryption key and the content identification information from the plurality of mounted memory chips, and the encryption read by the optical disc drive (11) When content data is specified by any of the plurality of content identification information read from the memory data reading unit (12), the specified encrypted content data is transferred to the large-capacity recording medium (18). Two or more encrypted content data are selected from the plurality of encrypted content data recorded on the content data recording unit (133) to be recorded and the large-capacity recording medium (18), and reproduced in a predetermined order Two or more ciphers that are instructed to play when receiving instructions from outside When each content data is identified by any of the plurality of content identification information read from the memory data reading unit (12), a decryption key acquisition unit that acquires a decryption key corresponding to the content identification information, respectively (136), a recorded content data acquisition unit (137) for sequentially reading out the two or more encrypted content data instructed for reproduction from the large-capacity recording medium (18), and the decryption key acquisition unit (136) And a content data decrypting unit (138) for sequentially decrypting the two or more encrypted content data sequentially read by the recorded content data acquiring unit (137) using the decryption keys read in (1). To do.

  According to the content recording / playback apparatus of the present invention, even if only one optical disk drive is built in, content data stored in a plurality of optical disks can be continuously played back without replacing the optical disk.

<Reproduction principle of content recording / reproduction apparatus of the present invention>
In the content recording / playback apparatus of the present invention, the encrypted content data stored on the optical disk is recorded on a hard disk drive which is a large-capacity recording medium in the apparatus, and a plurality of data recorded on the hard disk drive are recorded. A predetermined number of encrypted content data is selected from the encrypted content data, and the selected predetermined number of encrypted content data is sequentially decrypted using a decryption key stored in a memory chip corresponding to the encrypted content data. And play.

  This memory chip has a shape that can be mounted in a memory chip slot unique to the content recording / playback apparatus of the present invention, and the data of the decryption key is stored in a state in which it cannot be copied or rewritten. It is what you need.

  Encrypted content data stored on the optical disc can be copied, but the decryption key necessary for reproduction is made uncopyable to prevent unauthorized copying and reproduction.

<Configuration of Content Recording / Reproducing Device According to One Embodiment>
A content recording / reproducing apparatus 10 according to an embodiment of the present invention is for copying and reproducing content data stored in a plurality of optical disks to a built-in hard disk drive 18 in accordance with a user instruction.

  The configuration of the content recording / playback apparatus 10 according to the present embodiment will be described with reference to FIG.

  The content recording / reproducing apparatus 10 according to the present embodiment includes an optical disc drive 11, a memory chip slot 12 as a memory data reading unit, a CPU 13, a superimposing buffer 14, a D / A converter 15, and a user input unit 16. A main memory 17, a hard disk drive 18, and an MPEG2 decoder 19.

  The optical disk drive 11 reads the encrypted content data stored on the optical disk.

  The memory chip slot 12 is provided corresponding to each of a plurality of encrypted content data, and specifies a decryption key for decrypting the corresponding encrypted content data and the corresponding encrypted content data. A plurality of memory chips storing content identification information to be loaded are loaded, and the decryption key and the content identification information are read from the plurality of loaded memory chips.

  The CPU 13 includes a copy permission determination unit 131, a copy instruction acquisition unit 132, a content data copy unit 133 as a content data recording unit, a content identification information acquisition unit 134, a copy content data reproduction instruction acquisition unit 135, and a decryption key. It has an acquisition unit 136, a copy content data acquisition unit 137 as a recorded content data acquisition unit, a content data decryption unit 138, and a content data transmission unit 139.

  The copy permission / inhibition judging unit 131 has one optical disk among a plurality of optical disks inserted into the optical disk drive 11 and a decryption key for decrypting encrypted content data stored in the optical disk is recorded. When the memory chip is inserted into one of the plurality of memory chip slots 12, it is determined that the encrypted content data stored in the optical disk can be copied to the hard disk drive 18, and this copy is possible. Certain information is sent to the superimpose buffer 14 for display on the display device 20.

  The copy instruction acquisition unit 132 receives the content from the user input unit 16 when the copy permission determination unit 131 determines that the encrypted content data inserted into the optical disc drive 11 can be copied to the hard disk drive 18. When a copy instruction for copying data to the hard disk drive 18 is acquired, the acquired copy instruction is sent to the content data copying unit 133.

  When the encrypted content data read by the optical disc drive 11 is specified by any of the plurality of content identification information read from the memory chip slot 12, the content data copying unit 133 specifies the specified encryption Content data is copied to the hard disk drive 18 by copying.

  The content identification information acquisition unit 134 reads the identification information of the copied content data from the memory chip and records it in the memory chip list recording unit 172 described later.

  The copy content data reproduction instruction acquisition unit 135 acquires a reproduction instruction for reproducing the content data copied to the hard disk drive 18 from the user input unit 16 and sends it to the decryption key acquisition unit 136 and the copy content data acquisition unit 137.

  The decryption key acquisition unit 136 selects two or more pieces of encrypted content data from the plurality of pieces of encrypted content data recorded in the hard disk drive 18 and receives an instruction to reproduce them in a predetermined order from the outside. When each of the two or more encrypted content data instructed to be reproduced is identified by any one of the plurality of content identification information read from the memory chip slot 12, a decryption key corresponding to the content identification information is set. Get each.

  The copy content data acquisition unit 137 sequentially reads two or more encrypted content data instructed to be reproduced from the hard disk drive 18 and sends them to a hard disk content data recording unit 174 described later.

  The content data decryption unit 138 sequentially decrypts two or more pieces of encrypted content data sequentially read by the copy content data acquisition unit 137 using each decryption key read by the decryption key acquisition unit 136.

  The content data sending unit 139 sends the content data of the hard disk content data recording unit 174 decoded by the content data decoding unit 138 to the MPEG2 decoder for reproduction.

  The superimpose buffer 14 stores data to be displayed as superimpose.

  The D / A converter 15 performs digital / analog conversion of the input data.

  The user input unit 16 is operated by a user to perform a copy instruction for copying the content data stored in the optical disk inserted in the optical disk drive 11 to the hard disk drive 18 and playback for reproducing the content data copied to the hard disk drive 18. Enter instructions.

  The main memory 17 includes an optical disc content data recording unit 171, a memory chip list recording unit 172, a decryption key recording unit 173, and a hard disk content data recording unit 174.

  The optical disk content data recording unit 171 temporarily records the encrypted content data acquired from the optical disk by the content data copying unit 133 and sends it out for copying to the hard disk drive 18.

  The memory chip list recording unit 172 records the content identification information of the content recorded in each memory chip slot 12.

  The decryption key recording unit 173 temporarily records the decryption key acquired by the decryption key acquisition unit 136 and sends it to the content data decryption unit 138.

  The hard disk content data recording unit 174 temporarily records the encrypted content data acquired by the copy content data acquisition unit 137, and sends it to the content data transmission unit 139 when decrypted using the decryption key.

  The hard disk drive 18 records content data copied in accordance with an instruction from the user input unit 16.

  The MPEG2 decoder 19 decodes data encoded using the MPEG2 technology.

<Operation of Content Recording / Reproducing Device 10 According to One Embodiment>
The operation of the content recording / playback apparatus 10 according to the present embodiment will be described with reference to FIGS.

  FIG. 2 is a flowchart showing an operation when the encrypted content data stored on the optical disc is copied to the hard disk drive 18 built in the content recording / reproducing apparatus 10.

  First, an optical disk storing content data to be copied is inserted into the optical disk drive 11 by a user and set in a reproducible state (S1).

  Next, a memory chip in which a decryption key for decrypting encrypted content data stored in the optical disc inserted in the optical disc drive 11 and content identification information for identifying content data are recorded is a plurality of memory chips. It is confirmed by the copy permission determination unit 131 of the CPU 13 whether it is inserted into one of the slots 12, and if the memory chip is inserted, the encrypted content data can be copied to the hard disk drive 18. It is determined (S2).

  When the copy permission determination unit 131 determines that the encrypted content data can be copied to the hard disk drive 18, information indicating that the encrypted content data can be copied to the hard disk drive 18 includes the superimpose buffer 14 and the D / A converter. 15 and displayed on the external display device 20.

  Copying in which the content data encrypted on the display device 20 is displayed on the hard disk drive 18 and can be copied to the hard disk drive 18 and confirmed by the user. When an instruction is input, this copy instruction is acquired by the copy instruction acquisition unit 132 of the CPU 13 (S3).

  When the copy instruction is acquired by the copy instruction acquisition unit 132, it is sent to the content data copy unit 133, and the content data encrypted from the optical disk by the content data copy unit 133 is used by the composite key of the memory chip in the memory chip slot 12. And read out (S4).

  The read encrypted content data is temporarily recorded in the optical disk content data recording unit 171 of the main memory 17 (S5).

  The content data recorded in the optical disc content data recording unit 171 is copied by being sent to the hard disk drive 18 via the content data copying unit 133 and written (S6).

  The transfer speed in steps S4 to S6 depends on the transfer speed of the PCI bus connecting the optical disc and the CPU 13, and is 4 MB, for example.

  The content data copying unit 133 determines whether all data has been copied (S7). If there is still data to be copied ("NO" in S6), the process returns to step S4 to read and write content data. Repeat the process.

  When copying of all the data is completed (“YES” in S6), content data identification information is read from the memory chip inserted in the memory chip slot 12 by the content identification information acquisition unit 134, and the memory of the main memory 17 is read. It is recorded in the chip list recording unit 172 (S7).

  By repeating the processes of steps S1 to S7 described above, a plurality of encrypted content data is recorded on the hard disk drive 18, and information on the memory chip corresponding to the recorded content data is stored in the memory chip list. To be recorded.

  An example of a memory chip list in which information of memory chips corresponding to a plurality of content data is recorded is shown in FIG.

  The content recording / playback apparatus 10 according to the present embodiment incorporates five memory chip slots 12 with slot numbers 1 to 5, and in FIG. 3, the content file name “Movie-” is stored in the memory chip slot 12 with slot number “1”. The memory chip storing the decryption key of “060401204033.movie” is inserted, and the memory chip storing the decryption key of the content file name “Movie-060101101125.movie” is inserted into the memory chip slot 12 of the slot number “2”. This indicates that the memory chip storing the decryption key of the content file name “Movie-090801111955.movie” is inserted into the memory chip slot 12 of the slot number “4”.

  This completes the process of copying a plurality of content data to the hard disk drive 18.

  If it is determined in step S2 that the content data cannot be copied to the hard disk drive 18 ("NO" in S2), the process ends.

  Next, processing when a plurality of content data copied to the hard disk drive 18 is continuously reproduced will be described with reference to the flowchart of FIG.

  In order to continuously reproduce a plurality of content data copied to the hard disk drive 18, it is necessary to insert all the memory chips corresponding to the plurality of content data into the memory chip slot 12.

  First, when a reproduction instruction for reproducing a plurality of content data copied to the hard disk drive 18 is input from the user input unit 16 by a user operation, the reproduction instruction is acquired by the copied content data reproduction instruction acquisition unit 135. (S11).

  The reproduction instruction acquired by the copy content data reproduction instruction acquisition unit 135 is sent to the decryption key acquisition unit 136 and the copy content data acquisition unit 137.

  When the reproduction instruction is acquired by the decryption key acquisition unit 136, content identification information corresponding to content data to be reproduced first among the plurality of content data instructed to be reproduced is selected from the memory chip list recording unit 172 ( S12).

  Next, the decryption key acquisition unit 136 confirms whether the memory chip corresponding to the selected content identification information is inserted into one of the plurality of memory chip slots 12, and if it is inserted (in S13) "YES") A decryption key is acquired (S14).

  The decryption key acquired by the composite key acquisition unit is temporarily recorded in the decryption key recording unit 173 (S15).

  On the other hand, when the reproduction instruction is acquired by the decrypted content data acquisition unit, encrypted content data of the content to be reproduced first among the plurality of content data instructed to be reproduced is acquired from the hard disk drive 18 (S16). .

  The encrypted content data acquired by the decrypted content data acquisition unit is temporarily recorded in the hard disk content data recording unit 174 (S17).

  Next, the content data decrypting unit 138 acquires the decryption key from the decryption key recording unit 173, and decrypts the encrypted content data recorded in the hard disk content data recording unit 174 (S18).

  The decrypted content data is sent from the content data sending unit 139 to the MPEG2 decoder 19 and decoded, and then the information is imposed from the superimpose buffer 14 as needed and displayed on the display device 20 and played back ( S19).

  When the reproduced content data is completed, if there is content data to be reproduced next (“YES” in S20), the process returns to step S12, and the reproduction is continued.

  When the reproduction of all content data ends (“NO” in S20), the process ends.

  If the memory chip storing the decryption key for decrypting the content data to be reproduced in step S14 is not inserted in the above process, the process ends (“NO” in S13).

  According to the present embodiment described above, even if only one optical disk drive 11 is incorporated, content data stored in a plurality of optical disks can be continuously reproduced without replacing the optical disk.

  Moreover, it is also possible to construct a content recording / playback program that causes the computer to function as a content recording / playback device by programming the functional configuration of the content recording / playback device of the above embodiment into a computer.

  In the above description, an example in which a memory chip list is generated and a decryption key for reproducing content data using content identification information of the memory chip list is shown. The content identification information may be read from the memory chip inserted in the memory slot, and a decryption key for reproducing the content data may be acquired using the read content identification information.

  In the above description, the hard disk is used as the recording medium for copying the content data. However, the recording medium is not limited to the hard disk and may be any recording medium having a capacity capable of recording a plurality of content data. But it ’s okay.

It is a block diagram which shows the structure of the content recording / reproducing apparatus by one Embodiment of this invention. 5 is a flowchart showing an operation of a process of copying content data to the content recording / reproducing apparatus according to the embodiment of the present invention. It is a table | surface which shows the memory chip list recorded on the memory of the content recording / reproducing apparatus by one Embodiment of this invention. It is a flowchart which shows the operation | movement of the process which reproduces | regenerates the content data copied by the content recording / reproducing apparatus by one Embodiment of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 ... Content recording / reproducing apparatus 11 ... Optical disk drive 12 ... Memory chip slot 13 ... CPU
DESCRIPTION OF SYMBOLS 14 ... Superimpose buffer 15 ... D / A converter 16 ... User input part 17 ... Main memory 18 ... Hard disk drive 19 ... MPEG2 decoder 20 ... Display apparatus 131 ... Copy permission judgment part 132 ... Copy instruction | indication acquisition part 133 ... Content data Copy unit 134 ... Content identification information acquisition unit 135 ... Copy content data reproduction instruction acquisition unit 136 ... Decryption key acquisition unit 137 ... Copy content data acquisition unit 138 ... Content data decryption unit 139 ... Content data transmission unit 171 ... Optical disc content data recording unit 172 ... Memory chip list recording unit 173 ... Decryption key recording unit 174 ... Hard disk content data recording unit

Claims (1)

Encrypted content data stored in a plurality of optical discs is recorded on a large-capacity recording medium in the apparatus, and a predetermined number of encrypted contents are recorded from the plurality of encrypted content data recorded on the large-capacity recording medium. In a content recording / reproducing apparatus for selecting data, sequentially decrypting and reproducing the selected predetermined number of encrypted content data,
An optical disc drive for reading each of the encrypted content data stored in the plurality of optical discs;
Corresponding to each of the plurality of encrypted content data, a decryption key for decrypting the corresponding encrypted content data, and content identification information for specifying the corresponding encrypted content data A plurality of stored memory chips, and a memory data reading unit for reading the decryption key and the content identification information from the plurality of mounted memory chips,
When the encrypted content data read by the optical disc drive is specified by any of the plurality of content identification information read from the memory data reading unit, the specified encrypted content data is stored in the large-capacity A content data recording unit for recording on a recording medium;
When two or more encrypted content data are selected from the plurality of encrypted content data recorded on the large-capacity recording medium and an instruction to reproduce in a predetermined order is received from the outside, this reproduction is instructed. When each of the two or more encrypted content data thus identified is identified by any one of the plurality of content identification information read from the memory data reading unit, a decryption key corresponding to the content identification information is obtained. A decryption key acquisition unit,
A recorded content data acquisition unit for sequentially reading out the two or more encrypted content data instructed to be reproduced from the large-capacity recording medium;
A content data decrypting unit for sequentially decrypting two or more encrypted content data sequentially read by the recorded content data obtaining unit using each decryption key read by the decryption key obtaining unit;
A content recording / reproducing apparatus comprising:

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