Should a piracy issue arise, I'm sure that piracy@infopop.com or piracy@groupee.com would love to hear about that should that be the case...
As for what can be distributed, AFAIK the only "stock" files allowed to be shared are the language files; anything else can only be "how to modify" files (hence why the modifications at ubbdev are just instructions and addon files vs actual files).
I'm more than sure however, that Zar wouldn't violate his licensing agreement since, as most of us, his forum is the heart of his site...