1
Paul England, John D DeTreville, Butler W Lampson: Digital rights management operating system. Microsoft Corporation, Lee & Hayes PLLC, December 11, 2001: US06330670 (502 worldwide citation)

A digital rights management operating system protects rights-managed data, such as downloaded content, from access by untrusted programs while the data is loaded into memory or on a page file as a result of the execution of a trusted application that accesses the memory. To protect the rights-manage ...


2
Paul England, John D DeTreville, Butler W Lampson: Loading and identifying a digital rights management operating system. Microsoft Corporation, Lee & Hayes PLLC, December 4, 2001: US06327652 (452 worldwide citation)

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 subscribe ...


3
Paul England, John D DeTreville, Butler W Lampson: Key-based secure storage. Microsoft Corporation, Lee & Hayes PLLC, March 20, 2007: US07194092 (54 worldwide citation)

Secure storage for downloaded content on a subscriber computer is keyed to a trusted digital rights management operating system, a trusted application, a trusted user or a combination thereof. A one-way hash function is applied to a seed supplied by an application to produce a hashed seed that is us ...