An iterative encoding technique assesses trial watermark encoding of an object, and redresses any detected shortcomings in one or more successive re-encodings of the object. Other improvements concern web crawler-based watermark detectors, novel uses of meta-data in watermarks, applications of watermarks...http://www.google.com/patents/US6738495?utm_source=gb-gplus-sharePatent US6738495 - Watermarking enhanced to withstand anticipated corruptions
