The system 10, where {HEAD ~ the location} of {TAIL ~ at least a portion} of the digital watermark is represented by at least one of the following: sample, frequency, phase or combinations thereof 
of
The system 10 , where { HEAD ~ the location } of { TAIL ~ at least a portion } of the digital watermark is represented by at least one of the following : sample , frequency , phase or combinations thereof
OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH