Patent ID: 7797554

Claim:
A collector apparatus for exercising a right of digital information which has a value that is issued by an issuer apparatus, the collector apparatus comprising: a unit configured to receive, from a user apparatus, the digital information with a signature of the issuer apparatus and accreditation information with the signature, wherein the accreditation information includes information corresponding to verification keys that correspond to third parties that are trusted by the issuer apparatus and that assure tamper-proof capability of the user apparatus; a unit configured to generate unique session information and to send the session information to the user apparatus; a unit configured to receive information including a manifest corresponding to the digital information, the session information, and a verification key that corresponds to a third party from the user apparatus; and a unit configured to verify the session information, and the manifest, and to verify whether information corresponding to the verification key received from the user apparatus is included in the accreditation information in order to verify that tamper-proof capability of the user apparatus is assured by a third party that is trusted by the issuer apparatus.