Cryptography – Video cryptography – Copy protection or prevention
Reexamination Certificate
2007-04-10
2007-04-10
Moise, Emmanuel L. (Department: 2137)
Cryptography
Video cryptography
Copy protection or prevention
C705S051000
Reexamination Certificate
active
09621476
ABSTRACT:
A method and apparatus for storing and retrieving program material for subsequent replay is disclosed. The apparatus comprises a tuner, for receiving a data stream comprising encrypted access control information and the program material encrypted according to a first encryption key, the access control information including the first encryption key; a first encryption module, communicatively coupled to the tuner and communicatively coupleable to a media storage device, for further encrypting the encrypted program material according to a second encryption key and for encrypting the second encryption key according to a third encryption key to produce a fourth encryption key; a first decryption module communicatively coupleable to the media storage device, for decrypting the fourth encryption key retrieved from the media storage device using the third encryption key to produce the second encryption key, and for decrypting the further encrypted program material retrieved from the media program device to produce the encrypted program material; a conditional access module communicatively coupled to the first decryption module, for decrypting the encrypted access control information to produce the first encryption key; and a second decryption module, for decrypting the program material using the first encryption key.
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pate
Curren Christopher P.
Gagnon Gregory J.
Ha David D.
James Thomas H.
Kahn Raynold M.
Grunebach Georgann S.
Moise Emmanuel L.
Nguyen Minh Dieu
The DirecTV Group, Inc.
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