Patent ID: 7389421

Claim:
A computer storage medium having computer-executable instructions that, when executed by a computer, performs a method facilitating a watermark estimation-based attack countermeasure, the method comprising: facilitating the watermark estimation-based attack countermeasure by: obtaining a digital good, which comprises digital content embodied on one or more computer-readable media, wherein the digital good is not just a watermark; analyzing the digital good to determine that such digital good was subjected to a watermark estimation-based attack, in response to determining that such digital good was subjected to a watermark estimation-based attack performing a countermeasure comprising: determining an estimated attack-amplification value α likely employed by a watermark estimation-based attack on the digital good; producing an approximation of the digital good before it was subjected to the watermark estimation-based attack, whereby the produced approximation of the digital good facilitates a countermeasure to a watermark estimation-based attack, wherein the producing comprises: identifying portions of a probability distribution function (PDF) of the digital good that remain unchanged after the watermark estimation-based attack on the digital good; shifting the identified portions of the PDF of the digital good by the estimated attack-amplification value α; and determining the remainder of the PDF between the portions.