System and method for copy protection for digital signals

• US 20050021951A1
• Filed: 05/27/2004
• Published: 01/27/2005
• Est. Priority Date: 01/08/1998
• Status: Active Grant

• Current Assignee: Samsung Electronics Co. Ltd.
• Original Assignee: Samsung Electronics Co. Ltd.
• Inventors: Chaney, Jack
• Granted Patent: US 8,300,832 B2
• Time in Patent Office: Days
• US Class Current: 713/165
• CPC Class Codes: A47C 27/144 inside the mattress or cushion

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.

Claims

1-32. -32. (Canceled).

33. A method of copy protecting signals flowing from a descrambler module to a receiver via a link, comprising the steps of:

(a) generating a copy protection data signal by utilizing a scheme which uses random number generation;

(b) receiving a digital signal from the receiver via the link, said digital signal including a scrambled signal;

(c) descrambling the scrambled signal to obtain a descrambled signal;

(d) converting said descrambled signal into a copy protected signal using said copy protection data signal; and

(e) transmitting the copy protected signal to the receiver via the link.

34. The method of claim 33, wherein the step (a) of generating said copy protection data signal includes generating the copy protection data signal in the receiver.

35. The method of claim 34, further comprising the step of transmitting said copy protection data signal from the receiver to the descrambler module via the link.

36. The method of claim 33, wherein said digital signal in step (b) is encoded and scrambled.

37. The method of claim 33, wherein the descrambler module comprises a PCMIA card.

38. The method of claim 33, wherein the link comprises one or more communication mediums configured for carrying digital signals.

39. The method of claim 33, wherein the receiver and the descrambler module utilize IS679 compatible interfaces for communication via the link.

40. The method of claim 33, further comprising the steps of reconverting the copy protected signal to the digital signal in the receiver using said copy protection data signal.

41. The method of claim 40, further comprising the step of decoding the digital signal in the receiver after the step of reconverting the copy protected system.