| 摘要 |
<p>An information processing system and method for realizing an efficient processing by using an enabling key block (EKB) of a categorized tree structure. A path constituting a key tree having sub-trees sorted by category and managed by a category entity is selected, and an EKB composed of encrypted data on an upper-level key encrypted by a lower-level key on the selected path is created and provided to a device. The issuance of an EKB is managed with reference to an EKB type definition list where an EKB type identifier is related to identification data on one or more EKB-processable category trees.</p> |
