Sarabjeet Singh Bedi Rabia Bano Shekhar Verma Image Index Based Digital Watermarking Techniqu for Ownership Claim and Buyer Fingerprinting. 267-276 2008 World Congress on Engineering (Selected Papers) http://dx.doi.org/10.1007/978-90-481-2311-7_23 conf/wce/2008lnee db/conf/wce/lnee39.html#BediBV08