Yeah I really don't think he meant it that way, obviously my work is mine and everyone's work is theirs. Also since I'm in partial ownership of A3LUK all the rules put out there would be my decision also. He meant to say that if you work for us and make original content for the server we don't want you to sell it or give it some script kiddies.
Does that not mean that your work on the project is now owned by him by that rule? Maybe you should contact him and get it straight there. I know there's no way in hell I'd work for free to lose my rights on anything, or have to fight over my work.