Why not add the copyright information into the file format ?
One could define a new audio file format, in which the watermark is a part of the header block but is not removable without destroying the original signal, because part of the definition of the file format requires the watermark to be therein. In this case the signal would not really be literally ‘destroyed’ but any application using this file format would not touch it without a valid watermark. Some electronic copyright management system propose mechanisms like this. Such schemes are weak as anyone with a computer or a digital editing workstation would be able to convert the information to another format and remove the watermark at the same time. Finally this new audio format would be incompatible with the existing one. Thus the watermark should really be embedded in the audio signal. This is very similar to S.C.M.S (Serial Code Management System). When Philips and Sony introduced the ‘S/PDIF’ (Sony/Phillips Digital Interchange Format), they included the S.C.M.S.
One could define a new audio file format, in which the watermark is a part of the header block but is not removable without destroying the original signal, because part of the definition of the file format requires the watermark to be therein. In this case the signal would not really be literally ‘destroyed’ but any application using this file format would not touch it without a valid watermark. Some electronic copyright management system propose mechanisms like this. Such schemes are weak as anyone with a computer or a digital editing workstation would be able to convert the information to another format and remove the watermark at the same time. Finally this new audio format would be incompatible with the existing one. Thus the watermark should really be embedded in the audio signal. This is very similar to S.C.M.S (Serial Code Management System). When Philips and Sony introduced the ‘S/PDIF’ (Sony/Phillips Digital Interchange Format), they included the S.C.M.S. which provides a way
