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:
Jun. 20, 2006
Filed:
Jun. 12, 2002
Krishnamurthy Ganesan, Redmond, WA (US);
Pratul Dublish, Sammamish, WA (US);
Sandeep Sahasrabudhe, Kirkland, WA (US);
Clifford Paul Strom, Sammamish, WA (US);
Krishnamurthy Ganesan, Redmond, WA (US);
Pratul Dublish, Sammamish, WA (US);
Sandeep Sahasrabudhe, Kirkland, WA (US);
Clifford Paul Strom, Sammamish, WA (US);
Microsoft Corporation, Redmond, WA (US);
Abstract
A packager packages digital content for a user and a licensor issues a digital license to the user for the content such that the user renders the content only in accordance with the license. The licensor and packager share a Secret to allow the packager and the licensor to calculate a content key (KD) for the content. To package the content for the user, the packager calculates a content key (KD) based on the shared Secret and a content ID and encrypts the content according to (KD). To issue a license to the user for the content, the licensor also calculates (KD) based on the shared Secret and the content ID, encrypts (KD) according to a public key of the user to form the license, and sends the license to the user.