| 摘要 |
This invention relates to an information processing apparatus for permitting so-called grouping without recourse to group keys. A content server retains in advance certificates of devices subject to grouping. Each certificate contains a public key of the corresponding device. When providing a content, the content server authenticates the certificates of the grouped devices for which the content is destined (step S 281 ), encrypts a content key by use of public keys of the authenticated certificates (step S 283 ), and transmits the content key thus encrypted to each of the devices making up the group (step S 284 ) together with the content. The inventive apparatus is applied to devices that provide contents.
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