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Message: <blockquote data-quote="Alzrius" data-source="post: 8920657" data-attributes="member: 8461">I imagine it depends on the retroclone, since the 1974 OD&D is a very different beast from Unearthed Arcana-style AD&D 1E. That said, it's important to remember that it's not just a question of rules mechanics per se. The 3.5 SRD has more <a href="https://www.d20srd.org/indexes/spells.htm" target="_blank">spells</a> than the 5.1 SRD has <a href="https://5e.d20srd.org/indexes/spells.htm" target="_blank">spells</a>; the 3.5 SRD has more <a href="https://www.d20srd.org/indexes/magicItems.htm" target="_blank">magic items</a> than the 5.1 SRD has <a href="https://5e.d20srd.org/indexes/magicItems.htm" target="_blank">magic items</a>; the 3.5 SRD has more <a href="https://www.d20srd.org/indexes/monsters.htm" target="_blank">monsters</a> than the 5.1 SRD has <a href="https://5e.d20srd.org/indexes/monsters.htm" target="_blank">monsters</a>.To put it another way, you could almost certainly make some sort of OSR game with the 5.1 SRD. But the 3.5 SRD simply offers more to work with, and so OSR games which have already been produced under the 3.5 SRD probably can't just switch out the 3.5 SRD under the OGL v1.0a for the 5.1 SRD under CC license, because there's a strong chance that they've used stuff from the former that isn't in the latter.The concept is, sure, but since arrangements of words can potentially be a copyrightable expression, that means that you might be in tricky territory if you try to make up a 5.1 SRD-derived psionic power called tower of iron will, for instance. That term is <a href="https://www.d20srd.org/srd/psionic/powers/towerofIronWill.htm" target="_blank">in the 3.5 SRD</a>, but not in the 5.1 SRD.EDIT: For an example of this, OSRIC has an entry for the babau demon (page 213 of OSRIC v2.2). That's a creature you can find in the <a href="https://www.d20srd.org/srd/monsters/demon.htm#babau" target="_blank">3.5 SRD</a>, but doesn't appear in the 5.1 SRD. So OSRIC can't just be ported over from the OGL to Creative Commons as-is.</blockquote>

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