Contents distribution system, recording apparatus, signature apparatus, contents supply apparatus, and contents playback apparatus
First Claim
1. A contents distribution system for distributing second content relating to first content that is recorded on a recording medium, comprising:
- a second-contents supply apparatus operable to output signature data and the second content, the signature data having been generated based on content information of at least one of the first content and the second content, with use of first key information;
a key output apparatus operable to output second key information corresponding to the first key information;
a verification apparatus operable to verify the signature data with use of the second key information; and
a playback apparatus operable to play back the second content when the verification is successful.
2 Assignments
0 Petitions
Accused Products
Abstract
Second content relating to first content recorded on a portable recording medium is prevented from being illegally used. A contents supply apparatus outputs signature data and the second content to a playback apparatus, the signature data having been generated based on content information relating to at least one of the first and second content, with use of first key information. A distribution apparatus that distributes the first content outputs second key information corresponding to the first key information. The playback apparatus verifies the signature data with use of the second information, and plays back the second content when the verification is successful.
49 Citations
25 Claims
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1. A contents distribution system for distributing second content relating to first content that is recorded on a recording medium, comprising:
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a second-contents supply apparatus operable to output signature data and the second content, the signature data having been generated based on content information of at least one of the first content and the second content, with use of first key information;
a key output apparatus operable to output second key information corresponding to the first key information;
a verification apparatus operable to verify the signature data with use of the second key information; and
a playback apparatus operable to play back the second content when the verification is successful.
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2. A signature apparatus comprising:
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an acquisition unit operable to acquire, from a supply apparatus that supplies second content relating to first content that is distributed recorded on a recording medium, at least part of the second content;
a signature unit operable to generate signature information based on content information that includes the at least part of the second content, with use of first key information; and
an output unit operable to output the generated signature data to the supply apparatus, and output second key information that corresponds to the first key information and that is used for verifying the signature data. - View Dependent Claims (3, 4, 5, 6)
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7. A contents supply apparatus for supplying second content relating to first content that is distributed recorded on a recording medium, comprising:
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an acquisition unit operable to acquire the second content; and
an output unit operable to output supply information that includes signature data and second content to a playback apparatus, the signature data having been generated based on content information relating to at least one of the first content and the second content with use of first key information that corresponds to second key information output by a distribution apparatus that distributes the first content. - View Dependent Claims (8, 9, 10, 11, 12, 13)
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14. A playback apparatus for playing back second content relating to first content that is distributed recorded on a recording medium, comprising:
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an acquisition unit operable to acquire the second content; and
a playback unit operable to play back the second content when verification of signature data is successful, the signature data having been generated based on content information relating to at least one of the first and second content and that has been output by a supply apparatus that supplies the second content, and the verification having been performed with use of second key information output by a distribution apparatus that distributes the first content. - View Dependent Claims (15, 16, 17, 18, 19, 20, 21)
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22. A distribution apparatus for distributing permission information indicating permission to supply second content that relates to first content that is distributed recorded on a recording medium, comprising:
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an acquisition unit operable to acquire second key information from a supply apparatus that is permitted to supply the second content, the second key information corresponding to first key information used in generation of signature data that is supplied together with the second content; and
a recording unit operable to record the second key information that is to be used by a playback apparatus to verify the signature data, to the recording medium on which the first content is recorded. - View Dependent Claims (23)
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24. A playback program used in a playback apparatus for playing back second content relating to first content that is distributed recorded on a recording medium, the playback program comprising:
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an acquisition step of acquiring the second content; and
a playback unit step of playing back the second content when verification of signature data is successful, the signature data having been generated based on content information relating to at least one of the first and second content and that has been output by a supply apparatus that supplies the second content, and the verification having been performed with use of second key information output by a distribution apparatus that distributes the first content.
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25. A program recording medium having stored thereon a playback program used in a playback apparatus for playing back second content relating to first content that is distributed recorded on a recording medium, the playback program comprising:
a playback unit step of playing back the second content when verification of signature data is successful, the signature data having been generated based on content information relating to at least one of the first and second content and that has been output by a supply apparatus that supplies the second content, and the verification having been performed with use of second key information output by a distribution apparatus that distributes the first content.
Specification