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. 10, 2009
Filed:
Apr. 01, 2003
Vladan Djakovic, San Francisco, CA (US);
Vladan Djakovic, San Francisco, CA (US);
Zotus, Inc., San Francisco, CA (US);
Abstract
A clearinghouse authorizes a content provider to use a scrambler to scramble content using a content ID. The content provider provides the scrambled content to a content consumer. If the content consumer has a valid authorization, it can use a content descrambler and the content ID to descramble and access the content. Authorization takes the form of a electronically signed authority message including a device ID and the content ID. The authorization is valid for the content consumer if the device ID matches a corresponding value in the descrambler. The scrambler implements an irreducible scrambling function that can be performed quickly in special-purpose hardware but not on general purpose hardware or software. The scrambler and descrambler can also be used to authenticate the content consumer.