Hi Christopher, Check out our information about copyrights here: http://www.sba.gov/content/patents-trademarks-copyright/. The US Copyright Office may also be a good resource to help answer your questions: http://www.copyright.gov/help/faq/ Good luck!

You will have a very difficult time keeping images from people determined to
use them. In spite of using tools like a robots.txt file, javascript, Adobe
Flash, and HTTP handlers, the bottom line is that any screenshot with a
little Photoshop work can land your image in someone else's website.

I suggest adding a really obtrusive watermark to all of your images. At least
that would require the thief to do a great deal of work removing the
watermark if they want to use the image.

Just Google 'photoshop watermark' for several good posts on how to watermark
an image. You can also Google 'watermark online' and find some free online
tools if you don't have Photoshop.