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Message: <blockquote data-quote="prosfilaes" data-source="post: 6688453" data-attributes="member: 40166">If you want to have Product Identity, you don't put it in the SRD. That solves that problem. The CC-BY works very well in the case that you have a base document that everyone can extend with whatever they want, and the CC-BY-SA works very well in the case that you don't particularly want other people extending the system with Product Identity. (A CC-BY-SA Traveller would have not had the problem with the dead sectors, where some company built their worlds and disappeared, and nobody wants to obsolete their work but nobody can legally reuse it.) As I've said, I think the OGL failed in meaningfully compelling users to return anything useful to the collective pool, so one direction or the other is better.You are free to use whatever licenses you want on your work, so the creator wouldn't have to follow any CC-BY-SA license it put out, just like WotC didn't follow the OGL on its works.The best way to open some parts and not others is to create an SRD or PRD and only make that open. If you don't mix the material in any way, shape or form, it's perfectly clear to the reusers what they can and can't use. If you're using someone else's system, the underlying license being CC-BY is by far superior to it being the OGL, as you don't have to give anyone the right to use anything new from your work.</blockquote>