Ummm, what's odd is that theirs over 1million people using torrents, and the fact that if their was your friend being warned and why not the other 1million people?
I have heard that theirs no way they can get em all because theirs to many ip's floating around, and with all the prisons getting full, do you thin they'd really choice a downloader over a mass murderer? come on, your friend is just getting shit up on, kinda maybe a joke? people do scare you from time time.
maybe the guy who uploaded the torrent for you to download did it for a joke?
Don't forget, that you have in fact not downloaded any of the things mentioned and this email must have reached you by mistake, meaning it is a spam, which you should mark as such. Because a lawful guy like yourself would never do a bad thing.