With the release with the fourth version, Wizards on the Coast introduced its Match Procedure License, which represented a significant restriction compared to the pretty open insurance policies embodied from the OGL. In part as a reaction to this, some publishers (which include Paizo Publishing with its Pathfinder Roleplaying Sport) https://dungeonsdragonseditions69146.myparisblog.com/14791750/dungeons-dragons-editions-no-further-a-mystery