Patent ID: 7568100
Filing Date: 2009-07-28
Classification: G06T,G10L,G11B,H04L,H04N

Abstract:
1. A method for steganographically protecting a digital signal comprising the step of: a) providing a carrier signal that has been encoded with independent information; b) using a stega-cipher to steganographically decode independent information including a digital watermark from the carrier signal; c) generating a first derivative encoded signal representing the original carrier signal combined with the encoded independent information, including the digital watermark, wherein the first derivative encoded signal is an arbitrarily close approximation of the original carrier signal; and d) modifying the first derivative encoded signal to produce a second derivative encoded signal, wherein the second derivative encoded signal differs from the original carrier signal by a greater degree than the first derivative encoded signal differs from the original carrier signal, as measured by an arbitrary signal metric.