Patent ID: 8881190

Claim:
A system comprising: at least one interface configured to receive a first copy of a digital content, comprising a first digital watermark, and a second copy of the digital content, comprising a second digital watermark distinct from the first digital watermark, output by respective service reception devices; and at least one processing component configured to: determine a technique for attacking at least one of the first or second digital watermarks based at least in part on an identification of a type associated with the first or second digital watermarks wherein the attack comprises watermark removal; determine that multiple copies of the digital content are available; compare, based at least in part on the determined technique, at least the first and second copies of the digital content to identify data bits that are different between at least the first and second copies; identify at least one of the first or second digital watermarks based at least in part on the comparison; and remove the identified first or second digital watermark based at least in part on its identification.