Scott Craver Bede Liu Wayne Wolf An Implementation of, and Attacks on, Zero-Knowledge Watermarking. 1-12 http://springerlink.metapress.com/openurl.asp?genre=article&issn=0302-9743&volume=3200&spage=1 2004 conf/ih/2004 Information Hiding db/conf/ih/ih2004.html#CraverLW04