Electrical computers and digital processing systems: support – System access control based on user identification by...
Reexamination Certificate
2004-09-14
2009-10-13
Nalven, Andrew L (Department: 2434)
Electrical computers and digital processing systems: support
System access control based on user identification by...
Reexamination Certificate
active
07603563
ABSTRACT:
Content such as computer software, data representing audiovisual works, and electronic documents can converted from a machine-bound state to user-bound state without modification to the content data itself. Instead, keys used to access the content are converted from the machine-bound state to the user-bound state. In particular, the keys are kept in a passport data structure which can represent either a machine-binding or a user-binding. A machine-bound passport can be upgraded to a user-bound passport without modifying the bound content. The private key of the machine-bound passport, in cleartext form, is included in the user-bound passport and encrypted using a user-supplied password to bind the private key to the user. In addition, private user information is collected and verified and included in the user-bound passport. Upgrading a machine-bound passport can be initiated automatically upon detection that an attempt is made to play back machine-bound content on a machine other than the one to which the content is bound.
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Allard Edward J.
Ansell Steven T.
Brownell Jason S.
Cannon Susan A.
Cherenson Andrew R.
Klarquist Sparkman LLP.
Microsoft Corporation
Nalven Andrew L
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