HDMI is a real pain. Because of the slow back-and-forth negotiation of HDCP security every time your computer monitor or TV turns on, there's a big delay. Monitor went to sleep? Wiggle your mouse, then wait a second while your computer convinces itself that the same monitor it was just using is not a dirty imposter. Dragging a video currently playing from one monitor to another and it will black out, pause, then resume about a second later if everything goes smoothly. It's as if the PC is saying "Wait, wait, wait! What the hell is that? You didn't tell me you wanted to play video on the other monitor, too! Just let me go back and check if that's okay. ... Yeah, okay, it's cool. Totally cool. Don't even worry about it. Forget I was here." For extra lulz, try dragging THE EXACT SAME VIDEO, STILL IN PROGRESS straight back to the first monitor again. Same result. It's like your video card poops its pants every time something changes, including things it has seen several times before.
But of course all this is worth it, because we finally beat the pirates. Did you notice how there's way less piracy these days? No? Huh. Weird. I thought that was the whole point.
Mokalus of Borg
PS - Don't worry, I'm sure the next great technology will finally beat them.
PPS - And it's sure to be much less annoying and intrusive, right?