| 摘要 |
<P>PROBLEM TO BE SOLVED: To allow highly flexible content lending and borrowing among a plurality of users while ensuring a sufficient DRM environment. <P>SOLUTION: A plurality of client terminals 200 accessible to a server device 100 are prepared. An acquisition request processing unit 131 sends back, in response to an acquisition request from a client terminal 200A, encrypted content data C and first license data L to which a prescribed use period is set. A lending request processing unit 132 sends back, in response to a request for lending a client terminal 200B from the client terminal 200A, second license data L to which a new use period resulting from exclusion of a prescribed lending period from the use period is set, and invalidates the first license data L. A borrowing request processing unit 133 sends back, in response to a borrowing request from the client terminal 200B, third license data L to which the lending period is set. Each of the client terminals 200 decrypts and reproduces content only in the use period set to the license data. <P>COPYRIGHT: (C)2013,JPO&INPIT |
