BP not owns a some designs. They only think - they owns it. For example a Goliath.
Dark Reign (1997 year strategy game, Imperium Cyclone Fighter unit),
But all of that about graphics. If your are using BP SWF's you are law the BP copyrights. Changed or nope(i mean swf) - they can do the actions.
Just make you own client & server, as for example i am doing that. Change a bit graphics and your got you very own game