I do know, because I have an envelope full of information from the government about copyright and have taken two classes on internet law. Honestly, I don't really care about people posting movies or anything else online, because I have always made everything I recorded available for free. I think the internet should be about sharing information, not money. The point is that if you put a film (or piece of music) up on youtube.com that says "This is mine. I made it." That's probably a pretty good indication of copyright ownership. Also, just as ISPs can't be held liable for information posted through their service, I don't think youtube.com should be responsible either. You may see this, too, in the trial. Section 230 of the Communications Decency Act of 1996, "no provider or user of an interactive computer service shall be treated as a publisher or speaker of any information provided by another information content provider."