Watermarking is one approach to address the problem about authority of multimedia data. The concept of digital watermarking is associated with the data-hiding technique known as steganography. Digital watermarking has been proposed as a way to identify the source, creator, owner, distributor, or authorized consumer of multimedia data. Recently, DRM has emerged for the purpose of more powerful and integrated management system of multimedia contents. On the contrary to the watermarking technique, in the DRM systems we need to embed more than one data. In past watermarking techniques, we could distinguish individual watermarks but it was impossible to separate them. In this paper, we propose a new multiple image data embedding method for DRM using Fresnel transform. Two watermark images are Fresnel-transformed as the real number and imaginary number data individually for Fresnel transform, and the values of difference between coefficients of a transformed pattern and their average are embedded into an original image. Our watermarking model allows flexibility in hiding the watermark. It is possible to get many embedding patterns from by using various distance parameters with Fresnel transform. Watermarking experiments have shown the validity of our watermarking technique and its robustness in resisting attacks
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