Thanks again guys, he hasn't replied about the public use of the tilesets, so I think it would be safe to assume that provided the use doesn't escalate to everyone in the whole world using them it should be alright. The email he sent me first just explained that he allowed the level as it wasn't to be extensively used by a large community, so I don't really see why it couldn't be used within that community. If he ever does email me again, then I'll inform you guys, but until then you can assume that they are all up for public.
Have fun using them (though it does take a while to make a full screen with all the layers - just a heads up, there are three different tiles with varying transparency, which you can overlay onto another square tile to make it appear to be background)