I edited your post, please don't use the "p" word on this site, I do not want words like that on this site because I don't want people to find this site looking for that word in search engines.
The general problem you describe is about users scraping media from your site and then using it somewhere else without your permission and in ways that you do not intend.
I'm sorry if you are having a problem like that, but unfortunately it is not something I can solve for you. If you encrypt images they are not usable in a web browser so there is not a way to serve images and also protect them. Some photo sites may have ways of watermarking them or showing them inside a flash movie to make it more difficult to get the image but that is a specialized need for people trying to sell images, it is not a problem I can solve for you.