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:
Mar. 25, 2008
Filed:
Mar. 23, 2006
Glenn A. Morten, Bellevue, WA (US);
Reza P. Rassool, Stevenson Ranch, CA (US);
Glenn A. Morten, Bellevue, WA (US);
Reza P. Rassool, Stevenson Ranch, CA (US);
Widevine Technologies, Inc., Seattle, WA (US);
Abstract
A system, apparatus, and method are directed towards generating chains of encrypted decryption keys for content in a highly distributed environment. In one embodiment, the key chain may be provided within an Entitlement Control Message (ECM). An access key that enables decryption of a current link within the chain of decryption keys may be provided to a downstream recipient using an out-of-band mechanism. Alternatively, the access key may be provided through an in-band mechanism, such as through the use of Entitlement Management Message (EMM), or the like. In one embodiment, the access key within the EMM may be further encrypted by another encryption key that may be unique to the downstream recipient.