The presently claimed invention relates generally to video or audio data. One claim recites an apparatus. The apparatus includes an input to receive data associated with video or audio; a decoder to analyze the data associated with video or audio for a steganographic signal hidden therein, the steganographic...http://www.google.ca/patents/US8023692?utm_source=gb-gplus-sharePatent US8023692 - Apparatus and methods to process video or audio
