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US007480802B2
(12) United States Patent ao) Patent No.: Us 7,480,802 B2
Venkatesan et al. (45) Date of Patent: *Jan. 20,2009
(54) LICENSE-BASED CRYPTOGRAPHIC
TECHNIQUE, PARTICULARLY SUITED FOR
USE IN A DIGITAL RIGHTS MANAGEMENT
SYSTEM, FOR CONTROLLING ACCESS AND
USE OF BORE RESISTANT SOFTWARE
OBJECTS IN A CLIENT COMPUTER
(75) Inventors: Ramarathnam Venkatesan, Redmond,
WA (US); Yacov Yacobi, Mercer Island,
WA(US)
(73) Assignee: Microsoft Corporation, Redmond, WA (US)
( * ) Notice: Subject to any disclaimer, the term of this
patent is extended or adjusted under 35
U.S.C. 154(b) by 221 days.
This patent is subject to a terminal dis-
claimer.
(21) Appl.No.: 11/276,749
(22) Filed: Mar. 13, 2006
(65) Prior Publication Data
US 2007/0061580 Al Mar. 15, 2007
Related U.S. Application Data
(63) Continuation of application No. 09/315,734, filed on May 20, 1999, now Pat. No. 6,898,706.
