I'm telling you... you have every right to sue. Just go through the list as I suggested.
Go to the manager and ask him/her to take the levels down.
If he/she doesn't do so
Go to Stefan/Unixmad and ask them to take down the server
If they dont do so
Go to Cyberjourners and ask them to deal with the resolve
If they dont do so
Sue all parties.
If I paint a masterpeice and a musem steals it from me and says they have every right to use it. Then I'd sue them. It's the same way here.
Dont think it's just $20 or what ever. You can sue for Time, Lawyer, Transportation, etc.