"to live outside the law, you must be honest"
From my students, I get a lot of internet plagiarism -- mostly due to ignorance of proper methods of citation, I hasten to add (thus my hastening dash). Sometimes, however, I encounter premeditated theft of internet material.
One time, a student wrote his own introductory and concluding paragraphs, then inserted six paragraphs from Wikipedia and handed in the 'essay' as his own work. When I confronted him with the incontestable evidence of his plagiarism, he contested it anyway, claiming that the work was his own because he had written the introduction and conclusion before adding the long 'quote' in between as his 'research.' He wanted to maintain that his only error was in neglecting to add a footnote.
He had a point.
"Okay, add a footnote," I told him. "Then, you can get an honest F."