Are "fantasy name generators" of the sort you find all over the place online fair use if the weighting of their generators is based on statistical information about names in fantasy novels? I would think most people would agree they're fair use, or if not in so many words, I think those people would find it pretty unfair for WotC to go around suing sites for running D&D character name generators.

Or let's talk about another form of buying copyrighted / protected content and selling the results of transforming it: emulators. The Connectix Virtual Game Station was the impetus for one of the most important lawsuits about emulation, and the ruling held that even though writing an emulator inherently involves copying copyrighted code, the result is sufficiently transformative and falls under fair use.