. . . "A similar approach can be performed on other media types such as audio and video, using a wavelet transform or other types of transforms like an FFT, DCT, etc. [0248] One particular technique for adapting the watermark signal to a host image signal in which it is embedded is to replace the magnitude (phase is left in tact) of one set of Fourier coefficients, [0249] S1=(C1C2, . . ." . .