If you ever find someone using one of your photos (or writings, drawings, music, animation, movie, etc.) without your permission, and you want them to stop, you need to know what to say, and to whom to say it. Plagiarism Today has stock sample Cease & Desist Letters that you can adapt for your own use. Of course, I’m sure all the usual lawyer small talk applies, yada yada … no legal advice, get your own yada yada lawyer.
Great resource. In addition to downloading the file I’ve also subscribed to the site this was posted on. Thanks for the tip on this.