@bhavin192 That link is to my own site, written after I could help create that compatibility by providing lots of examples and dispelling lots of wrong fears in very long discussions :-)
I was one of the few people who actually had usecases where it hurt them.
Fun: This is why cc by-sa and GPL are now compatible: "On the personal side: we can merge art from Ryzom and Battle for Wesnoth and use both in the Pirate Party RPG."
(I triggered the start of that process by asking on a blog post :) )
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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