Plagiarism and Copyright On the web
In today's modern web world, publishing content legally on a website has all sorts ramifications. In general, you have the copyright over your material as soon and the words hit the page. However, some individuals or companies will steal content from others to use on their own web site. If you want to keep tabs of your content, you can go copyscape and search your pages. It will list sites who have similar or exact content.
Now that you found some of the culprits, you can compare the details with Way Back Machine at http://wayback.archive.org. Wayback.org will display a website throughout the years. In addition, it never hurts to keep backups of files and databases to show when you published your content. When you find a source of infringement, you can start the process of asking them to remove the content. The page http://www.copyscape.com/respond.php also explains some details about dealing with plagarism.