Patent ID: 8452016

Claim:
A method for use by a distributor to obtain content access authorizations from a central key repository (CKR), the method comprising: receiving a user request from a user device for access to an encrypted content, the user request including a secure digital receipt having information relating to a prior transaction corresponding to the encrypted content, wherein the secure digital receipt is a proof of the prior transaction, and wherein the secure digital receipt does not include a key for decrypting the encrypted content; transmitting a key request to the CKR in response to the receiving of the user request, the key request including a content identification from the secure digital receipt; receiving an encrypted first key from the CKR in response to the transmitting of the key request; decrypting the encrypted first key using a second key to retrieve the first key; and providing a DRM license, including the first key, for the encrypted content to the user device, in response to the receiving of the user request and for use by the user device to decrypt the encrypted content using the first key.