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Message: <blockquote data-quote="Lizard" data-source="post: 407001" data-attributes="member: 1054">The Open Gaming License is a CONTENT licence.The D20 Trademark license is a TRADEMARK license.All rules content is governed by the OGL. The D20 SRD at the OGF site was created by WOTC; the OGF is just hosting it. The OGF SRd, BTW, is 'unofficial'; it is being used under a 'gentleman's agreement' while the real SRD is being fully developed. (That's the one at the Wizard's site.) The catch is, if the non-official material changes prior to release, all publishers must change their works to comply prior to their next publication. (Once material has been officially released as Open Gaming Content, it's open forever, and such stipulations cannot apply. The 'gentleman's agreement' allows publishers to use material which is NOT Open as if it were, subject to the above caveat.)Nothing NOT in the SRD is Open Content, period. If it isn't in the SRD, it isn't free for you to use. (Unless, of course, it's been designated as open content by another publisher using the OGL!) Anything which is open content can be used freely -- copy it, change it, print it out and sell it -- provided you obey the terms of the OGL when you do so.The D20 license applies only to the right to use the D20 logo on the book. It has little to do with compatibility per se -- you agree not to redefine any 'defined terms' (these terms, and their definitions, are listed in the D20 Trademakr Guide), but you can create new terms. (i.e, you can't redefine 'Armor Class', but, you can ignore 'Armor Class' completley and use a 'Defense Factor' instead -- Defense Factor is NOT a defined term). Most importantly, though, you cannot include rules for creating a character or 'describing the effects of experience'. Again, see the D20 trademark guide for exactly what that means.</blockquote>

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