I still say, you're all overreacting to this shit.
I'm twenty-two years old, and as an adult, this just isn't how you're supposed to handle things. Someone steals something...it happens, it sucks, but what can you really do about it?
And warranting death threats can do nothing more than possibly getting you in a lot of trouble. Because if that user were to come around and see some of this he COULD have an investigation made into those threats. Be they on the internet or not, they're still threats, and they WILL hold up in court.
You can't copyright information you found and shared unfortunately. And thus there's nothing that can be done except full well know that YOU originally posted the information, and obviously you have a whole forum base here who knows it as well, so don't worry about it, just let it go. We all know you're in the right, and that it was your work, it'll all be cool man.
Just cool out.