Patent ID: 7489780

Claim:
A semiconductor integrated circuit for decryption of encrypted broadcast signals to produce decrypted broadcast signals, comprising: an input interface configured to receive the encrypted broadcast signals, encrypted control signals, and an entitlement message that includes a received ID and entitlement rights indicating the right of a user to receive the encrypted broadcast signals; an output interface configured to output the decrypted broadcast signals; a processing unit configured to receive the encrypted broadcast signals from the input interface, to decrypt the encrypted broadcast signals in accordance with control signals, and to provide the decrypted broadcast signals to the output interface; a key store configured to store a key; a decryption circuit arranged to receive the encrypted control signals from the input interface and to decrypt the encrypted control signals in accordance with the key from the key store; an ID store configured to contain a stored ID for the semiconductor integrated circuit; a rights store; a comparison circuit configured to to receive the stored ID and the received ID, to compare the received ID with the stored ID, and to cause the rights to be stored in a rights store only if the received ID and stored ID match; and at least one internal bus configured such that the internal bus is unconnectable-to from outside of the semiconductor integrated circuit and is arranged to carry control signals inside of the semiconductor integrated circuit to the processing unit such that the control signals are undetectable from outside of the semiconductor integrated circuit; and wherein the semiconductor integrated circuit is a monolithic semiconductor integrated circuit that is arranged to inhibit production of the decrypted broadcast signals if appropriate rights are not stored in the rights store.