Two points, firstly, it's ridiculing Hitler, a genuine monster, who's now seen pretty much as a comedy character by most people around today. Humour has robbed him of all his power, and I still think it's one of the best ways to attack someone who deals in terror and hate. With any luck 'Four Lions' will be a small step forward in respect of terrorism.
Secondly, as well as this being parody and protected, is this not a similar thing to music videos? Music videos were created specifically to be an advert for the music, so you'd go and buy the CD, and now they're tearing them down from the biggest video sharing site in the world?
Honestly, it seems a lot of companies are so terrified of what they may be 'potentially' losing, that they've lost sight of what they can gain if they stop to think for a moment instead of slapping legal letters in the direction of every website that dares to use .com in their address, just like 'our new movie's site, we have copyright on .com now'
There so much international social interaction that Downfall has hit millions of people, whereas , being a Film Four low budget movie, it may never have escaped the UK.
Just like, if you are talking to gamer friends from across the atlantic, you might send them a link to a music video of someone you like, that they'd never heard of.
Of course, now you can't do that, so you have to send them the mp3s thru your choice of messenger instead, making it far less likely that they'll go out and buy the album, than if they'd seen a youtube video and decided they liked them.
Has it not recently been proven that music lovers who pirate spend more on music than non pirates? Please, stop looking at these ethereal, 'potential' losses, and look at the money you're earning! Last time I got three numbers on the lottery and won £10 I was pleased, I didn't tear it up and just off a cliff because dammit it should have been all six numbers!