| US 7,570,768 B2 | ||
| Systems, structures, and methods for decrypting encrypted digital content when a rights management server has been decommissioned | ||
| Jason Cahill, Carnation, Wash. (US); Pavel Kouznetsov, Sammamish, Wash. (US); Kevin Brown, Carnation, Wash. (US); Lauren Antonoff, Seattle, Wash. (US); Marco DeMello, Redmond, Wash. (US); Peter David Waxman, Bellevue, Wash. (US); Scott Cottrille, Sammamish, Wash. (US); and Michael Selhorn, Seattle, Wash. (US) | ||
| Assigned to Microsoft Corporation, Redmond, Wash. (US) | ||
| Filed on Aug. 01, 2003, as Appl. No. 10/632,274. | ||
| Application 10/632274 is a continuation of application No. 10/607896, filed on Jun. 27, 2003, granted, now 7,392,547. | ||
| Prior Publication US 2005/0021987 A1, Jan. 27, 2005 | ||
| Int. Cl. H04L 9/00 (2006.01) | ||
| U.S. Cl. 380—281 | 12 Claims |
| 1. A method for rendering content encrypted according to a cryptographic key, the content having corresponding rights data
including a decryption key (KD) for decrypting the encrypted content, (KD) in the rights data being encrypted according to
a public key of a rights management (RM) server (PU-RM) to result in (PU-RM(KD)), whereby only the RM server having a private
key (PR-RM) corresponding to (PU-RM) can apply same to (PU-RM(KD)) from the rights data to obtain (KD), and whereby the RM
server normally delivers (KD) within a license that is bound to the content, and whereby the RM server upon being decommissioned
can no longer issue any such license, the method comprising:
receiving a notification that the RM server has been decommissioned;
attempting to render a piece of content;
determining that such content is protected to the decommissioned RM server;
sending a request to the decommissioned RM server for the content key (KD) for the content rather than any license; and
receiving (KD) from the decommissioned RM server.
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