Can a third party legally produce a D20 product (say, a new fantasy
campaign setting with new spells, prestige classes, items, ect...) via the
D20 license and not be involved with the OGL?
From what I can tell, the only reference to the OGL is one line above the
D20 license informing the reader to be familiar with the OGL. Nowhere in
the D20 license, that I have noticed, seems to imply that the OGL is
required to use it.
This is the assumption I am running with, but I wanted to double check.
Oh yeah, I realize that this is not the 'official' license, and what is
currently written is subject to change.