Editing D20 System (section)

===Development===
[[Ryan Dancey]] believed that the strength of ''[[Dungeons & Dragons]]'' came from its gaming community instead of its game system, which supported his belief in an axiom that [[Skaff Elias]] promoted known as the "Skaff Effect" which posited that other role-playing game companies increased the success of the market leader, which at that time was [[Wizards of the Coast]]. Dancey also theorized that the proliferation of numerous game systems actually made the role-playing game industry weaker, and these beliefs together led Dancey to the idea to allow other publishers to create their own ''Dungeons & Dragons'' supplements.<ref name="designers">{{Cite book |last=Appelcline |first=Shannon |title=Designers & Dragons |date=2011 |publisher=Mongoose Publishing |isbn=978-1-907702-58-7}}</ref>{{rp|287}} This led to a pair of licenses that Wizards of the Coast released in 2000, before 3rd edition ''Dungeons & Dragons'' was released: the [[Open Gaming License]] (OGL) made most of the game mechanics of 3rd edition ''D&D'' permanently open and available for use as what was known as system reference documents, while the d20 Trademark License allowed publishers to use the official "d20" mark of their products to show compatibility with those from Wizards of the Coast. Unlike the OGL, the d20 License was written so that Wizards could cancel it in the future.<ref name="designers"/>{{rp|287}}