Methods and arrangements for identifying content, and employing such identification, are detailed. One method embeds a plural-bit digital watermark into content, but first checks to see if the content is previously watermarked. Another method applies a digital watermark detection procedure to only a...http://www.google.fr/patents/US7751596?utm_source=gb-gplus-shareBrevet US7751596 - Methods and arrangements employing digital content items
Methods and arrangements employing digital content items
