The problem with the Internet is that information is freely available. You might not think that this is a problem, but for some folks, it is. Plagiarism has been hurting writers for centuries already and now with the Internet and how easy it is to just copy and paste, it has gotten worse. I understand how many writers find about this. Most people don't like their work to be stolen and sometimes even stolen for profit! Thus Copyscape is here to help you. It helps trace and track copies of your work on the Internet. Their solutions are able to detect plagiarism on other websites. If you are truly interested in protecting your work, you can try their premium solution. They claim that it provides an even more powerful detection system than their free service. I believe how it works is that they keep a copy of your work on your system and their system spiders content on the Internet and attempts to spot similarities. Once detected, they will imform you and you can take action. Nice.