Information processing device, information processing method, and computer program

• US 7,983,416 B2
• Filed: 08/20/2007
• Issued: 07/19/2011
• Est. Priority Date: 09/09/2006
• Status: Expired due to Fees

• Current Assignee: Sony Corporation (Sony Group Corp.)
• Original Assignee: Sony Corporation (Sony Group Corp.)
• Inventors: Takashima, Yoshikazu, Ueda, Kenjiro
• Primary Examiner(s): Zand; Kambiz
• Assistant Examiner(s): Shaifer Harriman; Dant B
• Application Number:
  US11/841,235
• Publication Number:
  US 20080063194A1
• Time in Patent Office: 1,429 Days
• Field of Search: 726/29
• US Class Current: 380/201
• CPC Class Codes: G11B 20/00086 Circuits for prevention of unauthorised reproduction or copying, e.g. piracy indicating unauthorised use of record carriers in general G11B23/28; scrambling for television signal recording H04N5/913; network architectures or network protocols for network security H04L63/00; cryptographic mechanisms or cryptographic arrangements for secret or secure communication H04L9/00
• CPC Class Codes: G11B 20/00115 wherein the record carrier stores a unique medium identifier
• CPC Class Codes: G11B 20/0021 involving encryption or decryption of contents recorded on or reproduced from a record carrier
• CPC Class Codes: G11B 20/00246 wherein the key is obtained from a local device, e.g. device key initially stored by the player or by the recorder
• CPC Class Codes: G11B 20/00362 the key being obtained from a media key block [MKB]
• CPC Class Codes: G11B 20/00427 advanced access content system [AACS]
• CPC Class Codes: G11B 20/00528 wherein each title is encrypted with a separate encryption key for each title, e.g. title key for movie, song or data file
• CPC Class Codes: G11B 20/00847 wherein the usage restriction is defined by a licence file
• CPC Class Codes: G11B 2020/1288 Formatting by padding empty spaces with dummy data, e.g. writing zeroes or random data when de-icing optical discs
• CPC Class Codes: H04N 21/835 Generation of protective data, e.g. certificates protecting software against unauthorised usage in a vending or licensing environment G06F21/10

Abstract

An information processing device that executes processing for outputting recording data to an information recording medium includes a storing unit that stores common data that includes encrypted content, key information applied to decoding of the encrypted content, and content management information and, data content of which is unchanged even if a medium as a data recording destination is changed, a media-specific-data generating unit that generates media specific data, data content of which is changed according to the medium as the data recording destination, an output-data generating unit that generates output data based on the common data and the media specific data, and a data outputting unit that outputs the data generated by the output-data generating unit.

Claims

1. An information processing device for outputting recording data to an information recording medium, the information processing device comprising:

a storing unit that stores common data that includes encrypted content, key information applied to decoding of the encrypted content, and content management information, data content of the common data being unchanged even if a medium as a data recording destination is changed;

a media-specific-data generating unit that generates media specific data, data content of the media specific data being changed according to the medium as the data recording destination;

an output-data generating unit that generates first and second output data by setting the first output data to include the common data and data to be obtained by replacing the media specific data with dummy data, and by setting the second output data to be the media specific data; and

a data outputting unit that outputs the first and second output data generated by the output-data generating unit.

2. The information processing device according to claim 1, wherein the media-specific-data generating unit receives a media identifier specific to the medium as the data recording destination and generates the media specific data including electronic signature data corresponding to data including the media identifier.

3. The information processing device according to claim 1, wherein the media-specific-data generating unit receives a media identifier specific to the medium as the data recording destination and identification information of a content certificate included in the content management information, and generates the media specific data including electronic signature data corresponding to data including the media identifier and the content certificate.

4. An information processing device for recording input data in an information recording medium, the information processing device comprising:

a data inputting unit that receives first and second input data, the first input data including common data and data obtained by replacing media specific data with dummy data, and the second input data including the media specific data, the common data including encrypted content, key information applied to decoding of the encrypted content, and content management information, data content of the common data being unchanged even if a medium as a data recording destination is changed, and data content of the media specific data being changed according to the medium as the data recording destination; and

a data recording unit that records the first and second input data received via the data inputting unit in the medium, wherein

the data recording unit records a file system image including the common data and the media specific data in the medium by recording the first input data in the medium, and then by overwriting or logically overwriting the second input data on top of the dummy data of the first input data.

5. An information processing method of outputting recording data to an information recording medium in an information processing device, the information processing method comprising:

generating, in a media-specific-data generating unit, media specific data, data content of the media specific data being changed according to a medium as a data recording destination;

acquiring, in an output-data generating unit, common data that includes encrypted content, key information applied to decoding of the encrypted content, and content management information, data content of the common data being unchanged even if the medium as the data recording destination is changed;

generating first and second output data, the first output data including the common data and data obtained by replacing the media specific data with dummy data, and the second output data including the media specific data; and

outputting, via a data outputting unit, the first and second output data generated in the generating the first and second output data.

6. The information processing method according to claim 5, further comprising:

receiving a media identifier specific to the medium as the data recording destination, the media specific data including electronic signature data corresponding to data including the media identifier.

7. The information processing method according to claim 5, further comprising:

receiving a media identifier specific to the medium as the data recording destination and identification information of a content certificate included in the content management information, the media specific data including electronic signature data corresponding to data including the media identifier and the content certificate.

8. An information processing method of recording input data in an information recording medium in an information processing device, the information processing method comprising:

receiving first and second input data, the first input data including common data and data obtained by replacing media specific data with dummy data, the second input data including the media specific data, the common data including encrypted content, key information applied to decoding of the encrypted content, and content management information, data content of the common data being unchanged even if a medium as a data recording destination is changed, and data content of the media specific data being changed according to the medium as the data recording destination; and

recording, via a data recording unit, the first and second input data in the medium, wherein

the recording includes recording a file system image including the common data and the media specific data in the medium by recording the first input data in the medium, and then overwriting or logically overwriting the second input data on top of the dummy data of the first input data.

9. A non-transitory computer-readable medium having instructions recorded thereon that when executed by a processor cause the processor to perform steps comprising:

generating, via a media specific data generating unit, media specific data, data content of the media specific data being changed according to a medium as a data recording destination;

acquiring common data that includes encrypted content, key information applied to decoding of the encrypted content, and content management information, data content of the common data being unchanged even if the medium as the data recording destination is changed;

generating, via a data generating unit, first and second output data, the first output data including the common data and data obtained by replacing the media specific data with dummy data, and the second output data including the media specific data; and

outputting, via a data outputting unit, the first and second output data generated in the generating the first and second output data.

10. A non-transitory computer-readable medium having instructions recorded thereon that when executed by a processor cause the processor to perform steps comprising:

receiving, via a data inputting unit, first and second input data, the first input data including common data and data obtained by replacing media specific data with dummy data, the second input data including the media specific data, the common data including encrypted content, key information applied to decoding of the encrypted content, and content management information, data content of the common data being unchanged even if a medium as a data recording destination is changed, and content data of the media specific data being changed according to the medium as the data recording destination; and

recording, via a data recording unit, the first and second input data in the medium, wherein

the recording includes recording a file system image including the common data and the media specific data in the medium by recording the first input data in the medium, and then overwriting or logically overwriting the second input data on top of the dummy data of the first input data.