| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a content distribution system capable of protecting copyright of content by confirming validity of a receiver in a limited reception method. <P>SOLUTION: A content distribution system 1 is characterized in that confidential information for each predetermined group of receivers generated by an authentication information generator 10 is previously registered in the receiver 60 and a security module 70, and the security module 70 authenticates the receiver 60 by determining identity of the confidential information and identity with updated confidential information distributed from a content distribution device 20. <P>COPYRIGHT: (C)2013,JPO&INPIT |
