PROVE IT. If you discover someone has used your photo on the Internet without permission, can you prove that it's your photo? Yes, Several companies provide protection for digitized photos by encoding your copyright information into the image in such a way that it can't be detected by the naked eye. The image owner is given a "secret password" which can be used to verify ownership. The popular PhotoShop graphic program accepts plug-in filters from image protection companies such as DIGIMARC, 1 503 626-8844 www.digimarc.com; and HIGHWATER FBI's INTERCHANGE (England) 44 (0) 1242 221-1390; www.highwatersignum.com; SYSCOP www.crcg.edu/syscop