Patent ID: 8656174

Claim:
A method of resynchronizing post-attack digital content with original digital content, comprising: determining a first transformation; applying the first transformation to the post-attack digital content to produce first transformed post-attack digital content; determining a first difference between the first transformed post-attack digital content and the original digital content; if the first determined difference does not indicate a selected degree of similarity between the first transformed post-attack digital content and the original digital content, then: determining a second transformation; applying the second transformation to the post-attack digital content to produce second transformed post-attack digital content; determining a second difference between the second transformed post-attack digital content and the original digital content; in response to the second determined difference indicating a selected degree of similarity and based, at least in part, on the second transformed post-attack digital content and the original digital content, determining embedded information from the second transformed post-attack digital content, wherein the determining the first difference comprises obtaining a distance measure between the first transformed post-attack digital content and the original digital content, and the determining the second difference comprises obtaining a distance measure between the second transformed post-attack digital content and the original digital content, and wherein the distance measure is responsive to a measure of spatial differences between corresponding pixels in a media stream in the spatial domain, and wherein the method is performed by at least one processor.