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
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United States of America Patent
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May 22, 2007
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N/A
app pub date -
Oct 20, 2004
filing date -
May 20, 1999
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Expired
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Abstract
A technique for imparting substantial break-once-run-everywhere (BORE) resistance to passive and active software objects, and for controlling access and use of resulting protected objects by a client computer (400). Specifically, a relatively large number, n, of identical watermarks (1720) are embedded throughout a software object (1700), through use of n different secret watermark keys to form a protected object, with each key defining a pointer to a location in the protected object at which a corresponding watermark appears.
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