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. 24, 2009
Filed:
Jul. 23, 2007
Lisa D. Amini, Yorktown Heights, NY (US);
Pascal Frossard, Bulle, CH;
Chitra Venkatramani, Roslyn Heights, NY (US);
Olivier Verscheure, Harrison, NY (US);
Peter Westerink, Ossining, NY (US);
Lisa D. Amini, Yorktown Heights, NY (US);
Pascal Frossard, Bulle, CH;
Chitra Venkatramani, Roslyn Heights, NY (US);
Olivier Verscheure, Harrison, NY (US);
Peter Westerink, Ossining, NY (US);
International Business Machines Corporation, Armonk, NY (US);
Abstract
Techniques for securely and adaptively delivering multimedia content. It is assumed that a set of alternate access units for each time slot is obtained. Then, the encryption stream index of each access unit from the set of alternate access units of the previous time slot are obtained. An encryption stream index is then assigned to each access unit in the set of alternate access units in the current time slot, such that the encryption index increases over time. Thus, the invention overcomes the problem of encrypting a multimedia stream that may have multiple access units for each time slot by selecting the encryption index for each access unit such that the encryption index increases, regardless of which access unit the delivery system (e.g., server) selects for transmission.