Open Game License 1.0a
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RPGs have variable players and duration.
Pits & Perils Open Supplement License
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RPGs have variable players and duration.
Open Content License (OPL)
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RPGs have variable players and duration.
Dominion Rules License
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RPGs have variable players and duration.
Blood of Pangea Open Supplement License
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RPGs have variable players and duration.
FUDGE Legal Notice
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RPGs have variable players and duration.
3Deep Compatibility License
rpgitem
RPGs have variable players and duration.