Search for your copyrighted material on the internet. Using a search engine such as Google, Bing or Yahoo!, search for a unique phrase from your material. This unique phrase should be between six and 12 words long, and not include the title. Place quotation marks around your phrase as this will bring back results that are identical to the phrase you entered. Your original article should appear in the results, along with any plagiarized versions of it on other sites.
Use Copyscape to find duplicate material. Copyscape requires the URL of the material that you wish to check for plagiarism, and if you are using the free version, will return a maximum of ten results. Copyscape uses results found on the Google search engine.
Use Plagium to find plagiarized material. Copy and paste a selection of text into the search form to find any websites that have copied the material. This service is free for unlimited results and uses results found on the Yahoo! search engine.
Sign up for a FairShare account. If your published material is connected to an RSS feed, where people can subscribe to your blog or content, you can enter the feed URL into FairShare and it will automatically alert you when someone posts similar content. This service is free, and will tell you what percentage of your writing has been copied and where it is copied.