06327652 is referenced by 452 patents and cites 36 patents.

The identity of an operating system running on a computer is determined from an identity associated with an initial component for the operating system, combined with identities of additional components that are loaded afterwards. Loading of a digital rights management operating system on a subscriber computer is guaranteed by validating digital signatures on each component to be loaded and by determining a trust level for each component. A trusted identity is assumed by the digital rights management operating system when only components with valid signatures and a pre-determined trust level are loaded. Otherwise, the operating system is associated with an untrusted identity. Both the trusted and untrusted identities are derived from the components that were loaded. Additionally, a record of the loading of each component is placed into a boot log that is protected from tampering through a chain of public-private key pairs.

Title
Loading and identifying a digital rights management operating system
Application Number
9/227611
Publication Number
6327652 (B1)
Application Date
January 8, 1999
Publication Date
December 4, 2001
Inventor
Butler W Lampson
Cambridge
MA, US
John D DeTreville
Seattle
WA, US
Paul England
Bellvue
WA, US
Agent
Lee & Hayes PLLC
US
Assignee
Microsoft Corporation
WA, US
IPC
G06F 9/445
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