Traveller

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I possess the MongTrav book but just in case this is too canon- looking here is the OGL:

Open Game License v 1.0a Copyright 2000, Wizards of the Coast, Inc.

Traveller System Reference Document Copyright © 2008, Mongoose Publishing.

Traveller is © 2008 Mongoose Publishing. Traveller and related logos, character, names, and distinctive likenesses thereof are trademarks of Far Future Enterprises unless otherwise noted. All Rights Reserved. Mongoose Publishing Ltd Authorized User.