CONTENT PROTECTION APPARATUS, AND CONTENT UTILIZATION APPARATUS
First Claim
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1. A content protection apparatus, performing:
- a processing of dividing content into a plurality of partial contents;
a processing of generating an editing-control-use secret key and a partial-content validation key for each of the partial contents;
a processing of generating a feature value for each of the partial contents;
a processing of assigning the one or more editable partial contents to each authorization using access-control information and generating first key-encrypted data by encrypting data obtained by coupling the editing-control-use secret keys to each other, using a public keyin the asymmetric-key cryptography assigned to each authorization, the editing-control-use secret keys being generated for the one or more editable partial contents assigned to each authorization;
a processing of generating an integrity-guarantee-use digital signature for the content; and
a processing of generating first encrypted content which includes the content, the access-control information, the partial-content validation keys, the feature values, and the first key-encrypted data.
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Abstract
Content is divided into a plurality of partial contents. Next, each of the partial contents is encrypted using a browsing-control-use secret key. Also, an editing-control-use secret key and a partial-content validation key are generated, then generating the feature value for each of the partial content. Moreover, key-encrypted data is generated by encrypting the browsing-control-use secret key and the editing-control-use secret key corresponding to each of the browsable and editable partial contents, using the public key of a user. Finally, encrypted content is generated from the key-encrypted data, encrypted partial contents, and the partial-content validation key.
57 Citations
12 Claims
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1. A content protection apparatus, performing:
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a processing of dividing content into a plurality of partial contents; a processing of generating an editing-control-use secret key and a partial-content validation key for each of the partial contents; a processing of generating a feature value for each of the partial contents; a processing of assigning the one or more editable partial contents to each authorization using access-control information and generating first key-encrypted data by encrypting data obtained by coupling the editing-control-use secret keys to each other, using a public keyin the asymmetric-key cryptography assigned to each authorization, the editing-control-use secret keys being generated for the one or more editable partial contents assigned to each authorization; a processing of generating an integrity-guarantee-use digital signature for the content; and a processing of generating first encrypted content which includes the content, the access-control information, the partial-content validation keys, the feature values, and the first key-encrypted data. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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Specification