A watermarking technique based on DWT is presented and the method that makes the watermarking robust to signal processing operations is discussed in this paper. These are based on the following works. Firstly we use a new pseudo-random sequence. Secondly, watermark embedding is performed in the wavelet domain using a content adaptive watermarking method based on MRF . Thirdly, a registration algorithm is proposed to improve the robustness to geometric transformations.