rcade
Hero
It is not required to put the System Reference Document in Section 15 of an OGL licensed work.That only means it uses the license, not that it is derived from the SRD
The only reason to list the SRD there is to indicate that your work is derived from it.
There are OGL-licensed games that do not include the WOTC SRD in Section 15. An example is D6 Fantasy:
Section 15
Open Game License v 1.0 Copyright 2000, Wizards of the Coast,
D6 Fantasy (WEG 51013), Copyright 2004, Purgatory Publishing Inc
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