Pathfinder 2e's text is completely written from scratch and it has original aesthetics and branding around the various things used in marketing (for example, ev

Pathfinder 2e's text is completely written from scratch and it has original aesthetics and branding around the various things used in marketing (for example, even the shared dragon types have different art and abilities). I think would leave the only real copyright and trademark concerns around things that were nominally invented by D&D, like tieflings and balor demons... and even those would be a stretch, since for the most part they're obviously based on preexisting pop culture (70s and 80s comic books for plenty of tiefling-like characters, the balor originally just being a slightly rethemed Tolkien balrog, etc).