Apparatuses and methods for copy protection

Details Apparatuses and methods for copy protection Apparatuses and methods for copy protection

2011-04-12

2011-04-12

Korzuch, William R (Department: 2431)

Cryptography

Video cryptography

Video electric signal modification

C726S031000

Reexamination Certificate

active

07925020

ABSTRACT:
Apparatuses and methods may include creating at least one of a scramble key and a descramble key using a Copy Protection (CP) key that existed prior to a refresh period and using a value created at a time associated with the changing of a channel during the refresh period, and using the at least one of the scramble key and the descrambled key until the CP key is refreshed at an end of the refresh period.

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Cablelabs: “CableCARD Copy Protection 2.0 Specification” OpenCable Specifications, Mar. 31, 2005, pp. 1-63, XP002601113.

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