“One third of teenagers don’t believe that downloading a paper from the Internet is a serious offense. To them, copying text from a Web site is either a minor offense or it’s not cheating at all. That’s the world we find ourselves in and educators find themselves in.”
MSNBC shares a list of tools and services that will help teachers and website owners detect copy-and-paste style plagiarism in school and on the web respectively:
One of the biggest players in online plagiarism programs is iParadigms, which offers three commercial services including Turnitin, a popular program used by around 8,000 educational institutes; WriteCheck, a “learning tool” designed for students to catch their own unintentional plagiarism and iThenticate, a program used primarily by corporations, law firms, research facilities, and scientific, medical and technical publishers (commercial publishers such as HarperCollins and Penguin have recently expressed interest, as well).
While a variety of packages are available, pricing for Turnitin generally ranges between $1 and $2 per student per year (there’s also a site license fee). WriteCheck charges $4.95 per 5,000 words and iThenticate offers customized pricing that depends on the type of customer, the intended use, and the expected volume. [link]
Copyscape also offers a free tool to help you detect copies of your content on the web.