Cryptography – Video cryptography – Video electric signal modification
Reexamination Certificate
2007-04-10
2007-04-10
Zand, Kambiz (Department: 2134)
Cryptography
Video cryptography
Video electric signal modification
Reexamination Certificate
active
09620773
ABSTRACT:
A method and apparatus for storing and retrieving program material for subsequent replay is disclosed. The apparatus comprises a conditional access module, for accepting encrypted access control information and the program material encrypted according to a first encryption key, the encrypted access control information including a first encryption key and temporally-variant control data; the conditional access module having a first decryptor module, for decrypting the encrypted access control information to produce the temporally variant control data; a conversion module for modifying the temporally-variant control data to produce temporally-invariant control data; a re-encryptor module, for re-encrypting the decrypted access control information; a second decryptor module for decrypting the re-encrypted access control information to produce the first encryption key; a copy protection encryption module, communicatively coupleable to the conditional access module and a media storage device, the copy protection encryption module 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; and a copy protection decryption module, communicatively coupleable to the conditional access module and the media storage device, the copy protection decryption module for decrypting the encrypted fourth encryption key to produce the second encryption key using the third encryption key.
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paten
Curren Christopher P.
Gagnon Gregory J.
Ha David D.
James Thomas H.
Kahn Raynold M.
Grunebach Georgann S.
The DirecTV Group, Inc.
Tran Ellen C
Zand Kambiz
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