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:
Nov. 25, 2008
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. In summary, the present invention describes a system and method for storing and retrieving program material for subsequent replay. The method comprises the steps of accepting encrypted access control information and the program material encrypted according to a first encryption key, the access control information including a first encryption key and control data; decrypting the received access control information to produce the first encryption key; decrypting the program material using the first encryption key; re-encrypting the program material using according to a second encryption key; encrypting the second encryption key according to a third encryption key to produce a fourth encryption key; and providing the re-encrypted program material and a fourth encryption key for storage. 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 the first encryption key and temporally-variant control data, the control access module comprising a first decryption module, for decrypting the access control information to produce the first encryption key; a first encryption module, for encrypting a second encryption key with a third encryption key to produce a fourth encryption key; and a second decryption module for decrypting the fourth encryption key to produce the second encryption key.