1. An image processing apparatus comprising: a watermark adding section for adding a watermark for copy control to an image, where the watermark includes a dot pattern which becomes visible as a result of making a copy, the dot pattern being indicative of an illegal copy warning; and a pattern adding section for adding a predetermined pattern to an appropriate position of an image, wherein the watermark adding section includes: a watermark generating section for generating a watermark for copy control, where the watermark includes a dot pattern which becomes invisible as a result of making a copy, the dot pattern being indicative of the illegal copy warning; a determining section for determining whether or not the pattern adding section adds the predetermined pattern to the image, when the watermark for copy control generated by the watermark generating section is added to the image; and a region setting section for setting a region where the predetermined pattern is to be appeared at a different portion where the dot pattern indicative of the illegal copy warning is added, when the determining section determines that the predetermined pattern is to be added to the image.