Display formatted text within WinForm App securely

I've got a large amount of formatted text that I need to display. I don't want the user to be able to copy it and the formatting is important. If I use a document, like .pdf or .swf it has to be accessed from within the application only. I realize that screen capture programs are tough to beat but I want to make it as difficult as possible to plagiarize.

Any ideas?

Thanks!