Since 2015 that’s a good option; for background see https://www.draketo.de/english/free-software/by-sa-gpl
@ArneBab Thank you for the link, after posting my toot I was reading about the compatibly of CC-BY-SA 4.0 with GPL on fsf.org.
It’s one of the crazy things that happen when you work in free culture at the boundary between different categories of art.
Roleplaying games are a strange mix between art book, prose, tutorial, and game rules — functional prose.
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