Patent ID: 8565426

Claim:
A method of copy protecting signals flowing from a security module to a receiver via an interface, the method comprising: (a) receiving a digital signal in the receiver, the digital signal including a combined scrambled and copy protected signal; (b) transmitting the digital signal from the receiver to a descrambler module of the security module via the-interface; (c) receiving a combined descrambled and copy protected signal from the descrambler module; and (d) reconverting the descrambled and copy protected signal to a non-copy protected descrambled signal in the receiver using a copy protection data signal obtained from the receiver, wherein use of the digital signal is prevented without access to and use of the copy protection data signal at the receiver, and the copy protected signal is prevented from being used for playing audio-visual information without using the copy protection data signal at the receiver to remove the copy protection from the descrambled copy protected signal.