apparently it's real..it's even on Metallicas website.
From their website-
"We have elected to pursue legal action against Unfaith, a Canadian band using chords (E & F) traditionally associated with Metallica. We intend to agressively defend our rights in this matter to the fullest extent of the law. It's nothing personal against the band in question, as we intend to do the same to anyone else using the same chords in that order.
We're not saying we own the E chord, or even the F - that would be ridiculous. We're just saying that together, people have grown to associate them with our music, and their continued use in the same song causes confusion, deception and mistake in the minds of the public.
We are fighting this fight for our fans, who don't deserve to be subjected to this confusion... just as we appreciate their support through this."
Ban Metallica NOW