tl;dr The following is what we've been able to learn so far.
YouTube or even our beloved ED would have to employ a phalanx of lawyers to ensure that the mountain of material uploaded every second isn't infringing on anyone's copyright. Or they could just shut down. ISP-level content filtering could boil down to spiders that scan and check your hard drives to ensure copyright compliance.
DMCA trolls wet dream
WMDs, you can fork over your iPhone and your Zune. Just kidding, no one owns a Zune.
—U.S. CUSTOMS AND BORDER PROTECTION, CBP DIRECTIVE NO. 3340-049
credits to ED