System and method for copy protection for digital signals
First Claim
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1. 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.
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Abstract
Embodiments of the present invention provide for the copy protection of distributed material after conditional access is applied, regardless of where the material is distributed. The solutions described provide the advantage of being sufficiently simple in implementation to qualify as “curb high” solutions. “Curb high” solutions provide a range of security from minimal security to a high level of security while requiring relatively fewer system resources to implement than prior approaches.
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Citations
11 Claims
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1. A method of copy protecting signals flowing from a security module to a receiver via an interface, the method comprising:
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(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. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A method of copy protecting signals flowing from a security module to a receiver via an interface, the method comprising:
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(a) receiving a digital signal in the receiver, the digital signal including a scrambled 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, which has been descrambled and copy protected using a copy protection data signal obtained from the receiver, from the descrambler module; and (d) reconverting the combined descrambled and copy protected signal to a descrambled signal in the receiver using the copy protection data signal, wherein use of the digital signal is prevented without access to 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 to remove the copy protection from the combined descrambled and copy protected signal. - View Dependent Claims (11)
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Specification