QuestWorlds - System Reference Document
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QUESTWORLDS-ORC LICENSE FAQ
What is Reserved Material?
Reserved Material is content that may appear in the Core Book that Chaosium retains the copyright to and you may not use without a license.Reserved Material elements in this product include but may not be limited to all artwork, illustrations, and graphic design, and trade dress, and all trademarks, including Call of Cthulhu, Chaosium, Future-World, Magic World, Pendragon, RuneQuest, Superworld, and Worlds of Wonder, and all other elements designated as Reserved Material under the ORC license.
Can I make a game using public domain material?
You can certainly do that. Make that Jules Verne game you always wanted, or something based off the works of Alexandre Dumas, or an ancient Roman trip to the moon inspired by Lucian of Samosata. Just make sure it is really public domain.
Can I make a game using someone else's intellectual property?
If it isn’t public domain, then you will need a license from the owner of the materials to create a game using their IP. Period. There is no fair use to Star Wars, for example.