TinEye is a reverse image search engine. You can submit an image to TinEye to find out where it came from, how it is being used, if modified versions of the image exist, or to find higher resolution versions. TinEye is the first image search engine on the web to use image identification technology rather than keywords, metadata or watermarks. For some real TinEye search examples, check out their Cool Searches page.
If you want to find out if your copyright protected image is stolen and being used in any other websites, this is really going to workout for you. really fantastic!. I was so amazed when I did testing with some random images from my collections. See a sample test results below.
Below image was found in 6 locations. TinyEye also provides exact path of the locations where you can find the same image. Great Tool for auditors to check copyright violations.