| 摘要 |
<p>A content distribution system (1) supplies a content from a content distribution device (2) in which contents are stored and which is used to supply a content to client devices (3a,...) to use the content. The content distribution system (1) comprises the content distribution device (2), the client devices (3a,...), and a communication network (4). The content distribution device (2) comprises a key creating means (26) for creating an encryption key according to a user ID specifying the content user and a content ID specifying the content the supply of which the user requests and an encrypted content creating means (27) for creating an encrypted content by encryption by using the encryption key. The client device comprises an encrypted content decrypting means (36) for inversely converting the encrypted content to the content by using the encryption key.</p> |
