Cryptography – Key management – Having particular key generator
Patent
1992-05-20
1994-04-12
Gain, David
Cryptography
Key management
Having particular key generator
380 7, H04N 7167
Patent
active
053032950
ABSTRACT:
A program control system for controlling access to premium programming and/or premium channels comprises a program control apparatus which may incorporate one or more subscriber modules. The subscriber modules may use one or more different types of program control technologies to provide different subscribers with different levels of access as well as different levels of security. One subscriber module may comprise a program control apparatus for interdicting premium programming signals transmitted "in the clear". Other modules may comprise positive or negative traps or bandstop filters. The program control apparatus allows a cable television provider to apply new or different program control technologies on a subscriber by subscriber basis.
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Nussrallah Steve
West Lamar E.
Gain David
Marvin William A.
Powers, III Frederick W.
Scientific-Atlanta, Inc.
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