| 摘要 |
<p>When a first content previously distributed is referred to in relation to a second content, the limit on the use of the first content effectively functions. A secret key and a public key are generated for the first content, and the first content to which the public key is added is transmitted. When a second content for which the user wants to refer to the second content is generated, the manager managing the first content is requested to sign predetermined data added to the second content by means of the secret key generated when the first content is broadcast. After the signature, the second content to which the signed predetermined data is added is transmitted. On the receiving side, collation of the signature on the predetermined data is performed by means of the public key added to the first content. If the collation succeeds, the stored first content is subjected to a predetermined processing according to the instruction of the second content and outputted.</p> |
