In a watermark process section in an image processing apparatus, a visible watermark pattern read-out section reads out a visible watermark pattern that is stored in a memory. An invisible watermark generating section draws an invisible watermark on the read-out visible watermark pattern. Image data,...http://www.google.ca/patents/US20060209349?utm_source=gb-gplus-sharePatent US20060209349 - Image processing apparatus and image forming apparatus
