It's an agreement that fans and content creators have been operating under for years: use Dungeons & Dragons (D&D) as the base system for your podcast, tabletop roleplaying game system.
Dungeons & Dragons D&D base system for podcast tabletop roleplaying game system Pathfinder, or Adventures in Middle Earth, or TV show and the game’s publisher, Wizards of the Coast, will not require royalties or pursue legal action if you follow its open licensing agreement.