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. 15, 2011
Filed:
Oct. 11, 2007
Rushmi U. Malaviarachchi, Redmond, WA (US);
Mayur Kamat, Bellevue, WA (US);
David B. Cross, Redmond, WA (US);
Rushmi U. Malaviarachchi, Redmond, WA (US);
Mayur Kamat, Bellevue, WA (US);
David B. Cross, Redmond, WA (US);
Microsoft Corporation, Redmond, WA (US);
Abstract
Protecting content. A recipient receives content from a publisher. Some content is managed by an access server. The access server controls the recipient's use of managed content through interaction with a trusted agent at the recipient. The content is encrypted to a content key, and the content is associated with policy information. The policy information includes the content key for decrypting the content. The policy information is encrypted to an access server key allowing the policy information to be decrypted by the access server. The content key is received from the access server. The content key is encrypted to a trusted agent key. The content key is further encrypted to additional factor(s) defining additional content protection beyond that provided by trusted agent. The content key is decrypted using the trusted agent key and the at least one additional factor. The content is decrypted using the content key.