All you do is open a new section of the forums, and server owners have to put in a request to get a license, the licesnse can be revoke at anytime. And only licensed server owners can get the server files.
That's how I would liek it to be done anyways. It is how PR does it which works great.
"Munchkin: One who, on being told that this is a game about politics and intrigue in 17th century Italy, asks to play a ninja."—
Andrew Rilstone