| 摘要 |
The usage restriction of a first content which has already been distributed is made to efficiently function when processing in which a second content refers to the first content is performed. A secret key and a public key are generated for a first content, the public key is added to the first content to transmit the first content, and when a second content which wants to refer to the first content is generated, a signature from a administrator of the first content by the secret key generated at the time of broadcasting the first content is requested on a predetermined data added to the second content. When the signature is given, the second content to which the signed predetermined data is added is transmitted. On the receiving side, by employing the public key added to the first content, processing that collates the signature on the predetermined data added to the second content is performed, and when the collation succeeds, a predetermined processing is given to the stored first content to output the first content based upon the instruction of the second content. <IMAGE> |
