System and method for trustworthy metering and deactivation

Details System and method for trustworthy metering and deactivation System and method for trustworthy metering and deactivation

2008-07-29

2008-07-29

LaForgia, Christian (Department: 2139)

Data processing: financial, business practice, management, or co

Business processing using cryptography

Usage protection of distributed data files

C726S027000, C713S323000, C380S201000

Reexamination Certificate

active

07406446

ABSTRACT:
A computer is adapted for use in different operating modes by configuring an output controller, such as a graphics processing unit, to screen output signals prior to presenting them to the output device. A secure environment in the output controller verifies a digital signature or a hash of the output signal to determine whether the output signal is compatible with the current mode of operation. Thus only authorized output signals are presented when the computer is operating in a limited function mode, such as when metered usage time is expired. The apparatus and method also disclose similar output signal screening for determining whether the computer should be returned from a standby, or no-metering, mode to an active, or metered mode.

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Written Opinion for PCT/US06/12811 mailed Sep. 25, 2007.

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