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:
Feb. 24, 2009
Filed:
Dec. 06, 2005
Howard Pinder, Norcross, GA (US);
Jonathan Bradford Evans, Atlanta, GA (US);
Anthony J. Wasilewski, Alpharetta, GA (US);
William D. Woodward, Jr., Lilburn, GA (US);
Howard Pinder, Norcross, GA (US);
Jonathan Bradford Evans, Atlanta, GA (US);
Anthony J. Wasilewski, Alpharetta, GA (US);
William D. Woodward, Jr., Lilburn, GA (US);
Cisco Technology, Inc., San Jose, CA (US);
Abstract
The present invention is suitable for use in a partial dual encrypted system. The present invention allows for two different decryption devices (e.g., an incumbent, or first, set-top and an overlay, or second, set-top) to be located in a single system having an incumbent encryption scheme and a second encryption scheme. Each set-top is designed to decrypt the first or second proprietary encryption schemes, respectively. In accordance with the present invention, the second set-top utilizes a novel program map table to ensure that the second set-top chooses correct elementary streams in the partial dual-encrypted stream (i.e., a combined stream including a first encrypted stream, a second encrypted stream, and a clear stream) for a desired program.