US Patent 12124542 User-protected license

Distributing and enforcing a license for content to be consumed according to conditions defined by usage rights stated in the license, including: encrypting the usage rights with a key using a homomorphic encryption and sending the encrypted usage rights to an agent; receiving from the agent modified encrypted usage rights generated by performing a homomorphic operation on the encrypted usage rights with a nonce; and decrypting the modified encrypted usage rights and sending the decrypted modified usage rights back to the agent, wherein usage rights are extracted from the decrypted modified usage rights by performing an operation that is reverse of the homomorphic operation with the nonce.