The .rsc for a game can be had WITHOUT having the host files.
I've seen a game or two(Namely Seika II) that has you download the rsc onto your computer when you login. Supposedly it reduces lag. After I logged into Seika II, I was looking through My Documents and found a Seika 2 folder in there with the rsc in it. And what do you mean by "host files"? The .dmb and .rsc?
-Exophus
Just getting the source code for DreamMaker wouldn't cut it. You'd have to understand how the compiler works well enough in order to reverse it, and as it has been said, the only one who understands it well enough to do that is Dan. Not even Tom knows it that well. It certainly wouldn't be "very easy".