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:
Oct. 05, 2010
Filed:
Apr. 05, 2005
Paul Baran, Atherton, CA (US);
Xu Duan Lin, Freemont, CA (US);
John Pickens, Newark, CA (US);
Michael Field, Milpitas, CA (US);
Paul Baran, Atherton, CA (US);
Xu Duan Lin, Freemont, CA (US);
John Pickens, Newark, CA (US);
Michael Field, Milpitas, CA (US);
GoBack TV, Inc., Menlo Park, CA (US);
Abstract
A conditional access method and apparatus for use with a system for controlling of digital TV program start time. Subscriber access is authorized to digital program streams. Content are divided into a plurality of working periods. Each working period of the plurality of working periods is scrambled with a different working key. A working key of a given period is delivered ahead of the given period. The working key is synchronized with scrambling control bits in an header. working keys are inserted into an entitlement control message (ECM) packet, and the ECM packet is encrypted using a service key. A time period is inserted into the ECM packet during which the service key is valid. A service key is inserted in an entitlement.