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Mechanics can definitely be copyrighted.
WotC has chosen to release some elements of 3.5, 4e and 5e under the OGL. This has never included any of the Wotc published settings, a handful of monsters (beholders, umber hulks, githyankis, githzerai and maybe a few others) and a few others. You can find the precise details in the OGL's.
my Realm Works videos
https://www.youtube.com/channel/UCZU...4DwXXkvmBXQ9Yw
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