Here’s a very cool site you can use to see if your web page content is being copied by other sites:

http://copyscape.com/

If you publish articles, enter the address of your article page. Or, just test your home page to see if your content is being ripped off. Should you discover your work is being used illegally, contact the site for resolution. If that doesn’t work, you should probably get a lawyer to help.

For more information about copyright law and protecting yourself, check out the copyright section of Nolo.com.