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The correct title of this article is d20 System. The initial letter is capitalized due to technical restrictions.
D20 logo 4

The d20 System is a system of game mechanics for roleplaying games published in 2000 by Wizards of the Coast and based on the third edition of Dungeons and Dragons. The system is named after the 20-sided die which is central to the core mechanics of the system.

Much of the d20 System was released as the System Reference Document (SRD) under the Open Game License (OGL) as Open Game Content (OGC), which allows commercial and non-commercial publishers to release modifications or supplements to the system without paying for the use of the system's associated intellectual property, which is owned by Wizards of the Coast.

The original impetus for the open licensing of the d20 System was the economics of producing roleplaying games. Game supplements suffered far more diminished sales over time than the core books required to play the game. Ryan Dancey, Dungeons and Dragons' brand manager at the time, directed the effort of licensing the new edition of Dungeons and Dragons through the 'd20 System Trademark', allowing other companies to support the d20 System under a common brand identity. This is distinct from the Open Game License, which simply allows any party to produce works composed or derivative of designated Open Game Content.

Theoretically this would spread the cost of supplementing the game and would increase sales of the core books, which could only be published by Wizards of the Coast under the Dungeons and Dragons and d20 System trademarks. (To this end, the SRD does not include rules for character creation and advancement.)

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