| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To provide measures to protect a copy right of content, capable of sufficiently coping even with a third party having expert knowledge and of being easily materialized. <P>SOLUTION: This content authentication system 100 includes: a storage medium 7 storing encrypted authentication information 72 for identifying presence/absence of use authority; and an information processor 1 authenticating the use authority about the storage medium 7. The information processor 1 has: a reading part 11 for reading the authentication information 72 from the storage medium 7; a decision part 15 for deciding whether the storage medium 7 has the use authority or not based on the read authentication information 72; and an output part 16 for updating contents of the authentication information 72 stored in the storage medium 7 to different contents when it is determined by the determination part 15 that the storage medium 7 has the use authority. <P>COPYRIGHT: (C)2009,JPO&INPIT</p> |
