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:
Jan. 05, 2010
Filed:
Sep. 20, 2004
Clifford P. Strom, Sammamish, WA (US);
Ian Cameron Mercer, Sammamish, WA (US);
James Morris Alkove, Woodinville, WA (US);
Jeffrey R. Mckune, Sammamish, WA (US);
Kevin Leigh Lachapelle, Redmond, WA (US);
Michael Jay Parks, Kirkland, WA (US);
Shunji Harada, Osaka, JP;
Toshihisa Nakano, Neyagawa, JP;
Kaoru Murase, Nara, JP;
Clifford P. Strom, Sammamish, WA (US);
Ian Cameron Mercer, Sammamish, WA (US);
James Morris Alkove, Woodinville, WA (US);
Jeffrey R. McKune, Sammamish, WA (US);
Kevin Leigh LaChapelle, Redmond, WA (US);
Michael Jay Parks, Kirkland, WA (US);
Shunji Harada, Osaka, JP;
Toshihisa Nakano, Neyagawa, JP;
Kaoru Murase, Nara, JP;
Microsoft Corporation, Redmond, WA (US);
Panasonic Corporation, Osaka, JP;
Abstract
A source generates a medium key (KM) and a media secret table including a plurality of entries, each entry including (KM) encrypted by a public key (PU-PD) of a plurality of devices, obtains the medium ID of a medium therefrom, generates a content key (KD) for a piece of content, encrypts the content with (KD) to result in (KD(content)), encrypts (KD) with (KM) to result in (KM(KD)), generates a package for the content including (KD(content)), (KM(KD)), the medium ID, and a signature based on at least the medium ID and verifiable with (KM), and copies the generated package and the media secret table to the medium. Thus, a device with the medium and a private key (PR-PD) corresponding to an entry of the media secret table can access and render the content.