Related Work

There has been a considerable amount of work on the subject of watermarking in the last few years. The most promising systems today are based on spread spectrum techniques. Such techniques were introduced in watermarking by [CKLS96,HG96], and have been largely improved in many different publications. We refer the reader to [Auc98,Pfi99] for an overview.

A summary of attacks aimed at defeating watermarking schemes in general can be found in [PAK98], and a recent survey on information hiding techniques in [PAK99].

Regarding the SDMI challenge, we are aware of the effort of other researchers, who claim to have defeated all the SDMI schemes [CMW$^+$]. Their technical report was to available at the time of this writing.