Icemark is an application to protect your copyrighted images from illegal use. It identifies your images by adding a personal, invisible watermark to them. The watermark can only be detected if you have the unique key for the watermark, which you must keep private. Icemark is easy to use and has a user-friendly interface. The Icemark license allows an unlimited number of images to be marked. Icemark features high speed searching of personally watermarked images, fast watermarking of a large number of images, high resistance to image changes, and the ability to work with a group of images simultaneously. The original image is not needed for watermark detection. It works with the JPEG, TIFF, PNG, and TGA formats.