A digitized signal is published with a blank watermark, i.e., a watermark which contains no specific watermark data, and a server computer system encodes specific watermark data into the watermark signal for each delivery of the digitized signal. A basis signal which is used to watermark a digitized...http://www.google.fr/patents/US7185200?utm_source=gb-gplus-shareBrevet US7185200 - Server-side watermark data writing method and apparatus for digital signals
Server-side watermark data writing method and apparatus for digital signals
