The audio watermarking method presented below oers copyright protection to an audio signal by modifying its temporal characteristics. The amount of modication embedded is limited by the necessity that the output signal must not be perceptually dierent from the original one. The watermarking method presented here does not require the original signal for watermark detection. The watermark key is simply a seed known only by the copyright o wner. This seed creates the watermark signal to be embedded. Watermark embedding depends also on the audio signal amplitude in a way that minimizes the audibility of the watermark signal. The embedded watermark is robust to MPEG audio coding, ltering, resampling and requantization.