Patent ID: 7260721

Claim:
An information processing apparatus for allowing usage of content by requiring a license for using said content, said information processing apparatus comprising: a content storage unit operable to store license-identification information for specifying said license for using said content, encrypted data of said content and key information required for decrypting said encrypted data of said content; a license storage unit operable to store said license for using said content, including content-specifying information for specifying said content and terminal-identification information which identifies the information processing apparatus, the use of which is allowed by said license; a judgment unit operable to determine whether said license for using said content has been stored in said license storage unit; a decryption unit operable to decrypt said encrypted data of said content if said license for using said content has been stored in said license storage unit; a device-node-key storage unit operable to store a device node key which is assigned the information processing apparatus from the license server when registering, wherein said key information includes an EKB (Enabling Key Block); and said decryption unit is operable to decrypt said EKB (Enabling Key Block) using said device node key to obtain a root key, and to decrypt said data of said content using said root key.