Reading this thread has made me tired. I'll do a simple reply to everything I think is worth my time.
It would be good etiquette to ask the creators first. If someone has a problem with it(and was not asked), just explain it(nicely). Doubt they'll argue much.
If they ever showed one of *my* AMVs, I would be freakin thrilled, whether they asked first or not.
If they used it to advertise something, *then* I would rather they ask me first. If they didn't ask and it happened to be something I really don't agree with(actually not much out there worth my time arguing over), would just ask them nicely to stop or use it for something else.
The anime companies aren't ever going to bother the AMV community, cause they'd just hurt themselves, and most of them seem to have enough intelligence to realize that.
I probably would have bought a total of 0 CDs the last year without AMVs. Instead I've gotten 3 or 4 of them. RIAA would also just hurt themselves, but don't seem to have the intelligence to realize that. Plus they do seem awful damn bored, sometimes. Not much we can do about anything until when(if) the RIAA attacks, so no point in worrying aside from occasional debates or info that are actually useful.
If the RIAA did go after the org and/or AMV makers, they probably would end up screwed over in the end, possibly with the DMCA ripped apart, indeed(more likely it would trigger or encourage a chain of events leading to that result, rather than the AMV community killing it). Anyway, don't mess with the otaku.
Ok, that was fun. I go do something else now.