Article on the Origins of Plagiarism on Penn State Copyright Perspectives Site
Link to article on the origins of plagiarism at http://copyright.psu.edu.
One of the earliest artists to wage war against plagiarism was the Roman poet Martial. You can read more about his efforts (with citations) at Copyright Perspectives (http://copyright.psu.edu/2011/10/beginnings-of-plagiarism.html).
