Someone looked at the EULA of Freespace 2 and saw a clause that said in effect, "Share with your friends, we don't care"
well, we figured we were all friends even though we had never met in person. So one guy made copies of the game and shipped them out to everyone. The way it worked was, one person would make an original. Then the guy who received it would make a copy for himself and send the original along to the next guy on the list. If you goto sharingthegroove.com they do something like that with their trees/vines. Hell, I'd start one, but I don't have a copy of the stuff
http://www.sharingthegroove.org/msgboard/forumdisplay.php?s=&forumid=16
look at this. this is how to share stuff like this.