Posting content illegally IS illegal and you can theoretically contact the hosting companies and threaten with litigation. It has been done and illegal content -- anything from e-books to pictures from Playboy -- are taken down on a regular basis around the net.
Or you can let it slide.
Or you can think really nasty thoughts about the ne'er-do-wells who did it.
Barron Vangor Toth
www.BarronVangorToth.com