by the fans for the fans

So we all know about the restrictions on Macross but what other ones are there? What exactly can HG make derivatives from? The restrictions seem to be all over the place. Apart from Macross what can or can't HG do with Southern Cross & Mospeada? I heard that they can't even really use the mecha in southern Cross or fully use what's in Mospeada either. If this has been asked just point me to the thread where it's answered.