| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To provide an imaging service system offering a variety of services to a user by providing a play list, while preventing unauthorized appropriation of the play list. <P>SOLUTION: A lab 50 makes up a play list and records it in a DVD 1, while encrypting with a public key. When a user reproduces, requiring the play list on a personal computer 150 using the DVD 1, the personal computer 150 compares the information of own token with the token information included in an access ticket issued from an access ticket issue center 100 in matching with the token information of the personal computer. Only when two pieces of token information agree with each other, will the personal computer 150 decode the play list with a private key included in the access ticket so that it is used in reproduction. <P>COPYRIGHT: (C)2006,JPO&NCIPI</p> |
