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It is not very convenient to bring along the original image as well as the watermark whenever one need to run the watermark extraction for ownership verification or image authentication. We introduce a novel watermarking scheme by taking the advantage of blind source separation technique. Using only a single 'key image' which can be issued to public, the new watermarking algorithm is able to extract the watermark without requiring the original image and any information of the watermark. The new method, undergoing a variety of experiments, has shown a good performance against many salient attacks.