Changes

Much of the d20 System was released as the [[System Reference Document]] (SRD) under the [[Open Game License]] (OGL) as [[open gaming|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]].<ref name="concept_faq">[http://www.wizards.com/default.asp?x=d20/srdfaq/20040123a The d20 System Concept: Frequently Asked Questions]</ref>