Patent ID: 7571488

Claim:
A rights management terminal that manages a copyright of a content using a license that includes a usage rule of the content, said rights management terminal comprising: a first certificate management unit operable to manage, as a set, a first public key certificate and a first private key, the first public key certificate including identification information that identifies at least one of said rights management terminal and a user using said rights management terminal, and the first private key being paired with a first public key included in the first public key certificate; a second certificate management unit operable to manage, as a set, a second public key certificate and a second private key, the second public key certificate not including the identification information, the second private key being paired with a second public key included in the second public key certificate; a selection processing unit operable to select, as a set, one of the following: the first public key certificate and the first private key; and the second public key certificate and the second private key; and an authentication processing unit operable to execute authentication for communicating with a server apparatus, using the public key certificate and the private key which are selected as a set by said selection processing unit, wherein said selection processing unit is operable to select, as a set, the public key certificate and the private key to be used for authentication, according to a type of execution command used during the communication with the server apparatus, wherein said selection processing unit is operable (i) to select, as a set, the second public key certificate and the second private key in the case where the execution command indicates a transmission, to the server apparatus, of usage information related to a usage of the content used by the user, and (ii) to select, as a set, the first public key certificate and the first private key in other cases, and wherein the usage information is a usage history of the content.