Cryptography – Video cryptography – Video electric signal modification
Reexamination Certificate
2005-02-08
2005-02-08
Grant, Chris (Department: 2611)
Cryptography
Video cryptography
Video electric signal modification
C380S210000, C380S201000, C725S025000, C725S031000, C386S349000
Reexamination Certificate
active
06853728
ABSTRACT:
A system and method for storing and retrieving program material for subsequent replay is disclosed. The method comprises the steps of receiving access control information and the program material encrypted according to a first encryption key, the access control information including the first encryption key and control data; further encrypting the access control information and the encrypted program material according to a second encryption key; encrypting the second encryption key according to a third encryption key to produce a fourth encryption key; and storing the encrypted access control information and encrypted program material and the fourth encryption key.
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Curren Christopher P.
Gagnon Gregory J.
Ha David D.
James Thomas H.
Kahn Raynold M.
Crook III John A.
Demicco Matthew
Grant Chris
Grunebach Georgann S.
The DIRECTV Group Inc.
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