Patent ID: 8667601

Claim:
A method for upgrading a rights object installed in a removable media, the method comprising: receiving, from a Rights Issuer, an upgrade trigger message including a rights object identifier, and an asset identifier, wherein the rights object identifier is related to a rights object to be upgraded, and the asset identifier identifies contents associated with the rights object; transmitting, to the removable media, a rights information request message including the asset identifier; receiving, from the removable media, a rights information message including rights information associated with the contents identified by the asset identifier and a first identifier of the rights information, wherein the rights information request message further includes a length of the rights information that can be included in the rights information message, the rights information message is received one or more times, and the rights information message further includes a flag indicating whether or not subsequent rights information messages follow; checking whether the right information included in the rights information message corresponds to the rights object identifier included in the upgrade trigger message; and performing an encryption key retrieval procedure, wherein the encryption key retrieval procedure comprises: transmitting, to the removable media, an upgrade information request message including the first identifier of the rights information and a newly generated second identifier; receiving, from the removable media, an upgrade information message including an encryption key for the rights information corresponding to the first identifier; and performing a rights upgrade procedure based on the rights information and the encryption key.