| 摘要 |
PROBLEM TO BE SOLVED: To realize a system and a method for processing information, which can execute an effective processing using an effective key block(EKB) using a categorized key structure. SOLUTION: This system comprises a configuration, which provides a device with an EKB that is generated from encrypted data of an upper key by a lower key of a key tree which has a plurality of sub trees categorized and managed by category entity, where EKB utilization entity is notified of status change occurrence caused by a revoke or the like in a category tree, which is defined in the EKB type definition list and is capable of EKB processing, so as for EKB requester to be processed in accordance with a latest EKB always. |
