Welcome to WebmasterWorld Guest from 188.8.131.52
Can you be more specific in your AOL example?
Honestly, defeating copy thieves is really tough. Anytime they can view your source than can copy. They can highlight, copy, and past. They can save your web pages to their hard drives etc.
The most effective offense against this is having a cease and desist template ready and firing it off to the web owner and their ISP when you find examples of your text being taken.