The Pathfinder video games are directly from the Pathfinder tabletop game, which is basically a different copyright of D&D. They would need a DM. I'm not sure what else you could be thinking.
Edit: DM = Dungeon Master (D&D), GM = Game Master (Pathfinder), as this user pointed out below.
Why would a DM be involved in a Pathfinder game though?
The Pathfinder video games are directly from the Pathfinder tabletop game, which is basically a different copyright of D&D. They would need a DM. I'm not sure what else you could be thinking.
Edit: DM = Dungeon Master (D&D), GM = Game Master (Pathfinder), as this user pointed out below.
They're called GMs in Pathfinder ;)
Dungeon Master is a DnD term, and trademarked by WotC.
+1 Hate for intellectual property law