Yes, sure, it would be a copyright violation to write today a novel set on a giant space artefact containing a flattened full-scale map of Earth, where a motley crew (including a bald human on anti-aging drugs) crash-lands and investigates, finding the machinery of the world breaking down, where those things are “the Ringworld”, Luis Wu, superconducting wire destroyed by a synthetic microbe, and Boosterspice; but that didn’t stop Pratchett writing Strata with “the flat world”, Kin Arad, general entropy, and Days.