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Message: <blockquote data-quote="Morrus" data-source="post: 6564377" data-attributes="member: 1">As mentioned above, the d20 System Trademark License was rescinded years ago.  You can't use it, or the d20 trademark logo.  That said, the logo has no value these days anyway, so you're not missing anything. The OGL is still valid, and cannot be rescinded.If you designated it as Open Gaming Content, then it's open.  Anybody can do anything they like with it, for free or for profit, subject to the terms of the OGL.  If you don't designate it as OGC, then it's not open.  That's what designating stuff as OGC means. If you don't want people to use it in that way, don't designate it as Open Gaming Content.The d20 STL indicated how you were able to show compatibility.  That license is no longer valid.  The OGL says that you can only use trademarks you have permission for.That's basically it. The OGL says only use trademarks you have permission for; the d20 SRD which gave you that permission and described how you should do so is no longer vaid; ergo if you use the OGL you cannot directly indicate compatibility.You therefore have three choices:1) Don't use the OGL.  You are then not restricted by it.  You can indicate compatibility, but you'd best know your copyright/trademark law.2) Use the OGL and obliquely indicate compatibility in some way.3) Just use the Pathfinder license instead, which makes it far easier for you!</blockquote>