The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Apr. 10, 2007
Filed:
Jul. 21, 2000
Raynold M. Kahn, Los Angeles, CA (US);
Gregory J. Gagnon, Torrance, CA (US);
David D. Ha, San Gabriel, CA (US);
Peter M. Klauss, Torrance, CA (US);
Christopher P. Curren, Brentwood, CA (US);
Thomas H. James, Pacific Palisades, CA (US);
Raynold M. Kahn, Los Angeles, CA (US);
Gregory J. Gagnon, Torrance, CA (US);
David D. Ha, San Gabriel, CA (US);
Peter M. Klauss, Torrance, CA (US);
Christopher P. Curren, Brentwood, CA (US);
Thomas H. James, Pacific Palisades, CA (US);
The DirecTV Group, Inc., El Segundo, CA (US);
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.