It's too late. We've now got him cold now with your help. You're reward for turning in copyright violators is in the mail. Thanks again, we couldn't have done it without you. Umm... no, don't worry, copyright violation is an internet myth.
Just after graduate school I received a grant to create a web-based computer simulation. Since I had grant money, I didn't skimp and I made sure to purchase stock photography from a legitimate source (iStockphoto.com). At the time, each picture cost between $.25 and $1.00, for which I received redistribution rights on the web. About 10 years later, I received a letter from a law firm threatening to sue me for copyright infringement on behalf of Getty Images (who owns iStockPhoto). Their bot had apparently come across one of their photos still on that website but for whatever reason, they decided that it was being used illegally. They asked for a $795 settlement for it to not go to trial. I ignored them. After that, I would receive another letter every 6 months like clockwork, each time upping the ante another $200 or so until they got up to about $1,500. Based on the fact that I had receipts for the many images I had purchased, I decided to keep ignoring them thinking that it was a shakedown and that if they did go to court, I had a viable defense. The last letter I received was about 2 years ago with a "one-time offer" to settle for $900. I ignored that one, as well. So far, they seem to have given up on me but rightly or wrongly, I totally understand being skittish about using something that could be construed as a copyright infringement.
With that said, a few weeks ago I discovered a website that has several instructional materials I have created over the years that they are making available for download for a subscription fee. The funny thing is that each item prominently features my copyright notice that I always place on everything I create. I am in the process of writing a cease and desist letter as we speak. If they take it down and don't do it again, I will quit while I'm ahead, but that's not how others (like Getty Images) work. Every year I receive a number of requests for permission to use something I have created. If it is for non-profit use, I pretty much always say "yes" and do not ask for money. Having someone use original work as part of a commercial business is another story though.
Unfortunately, copyright infringement on the web is not a an urban legend.