System Reference Document

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In the open gaming movement, a System Reference Document (SRD) is a reference for a role-playing game's mechanics licensed under a public copyright license to allow other publishers to make material compatible with that game. In 2000, Wizards of the Coast pioneered this by releasing a SRD for Dungeons & Dragons 3rd edition under their Open Game License (OGL).

Dicebreaker described a SRD as a "handy guide on how to use, hack and implement an existing game system for your own purposes".^[1]