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<blockquote data-quote="Staffan" data-source="post: 8474716" data-attributes="member: 907">I'm not a lawyer, but open licenses in general (e.g. the OGL, Creative Commons, GPL, etc.) tend to be accepted by including them in the product itself, thereby stating &quot;I am using this material under this license and accepting the terms thereof.&quot;But if I were to release a D&amp;D supplement, I would not automatically be doing so under the OGL, and so I would not be bound by its terms. For example, one of the terms of the OGL is &quot;You agree not to indicate compatibility or co-adaptability with any Trademark or Registered Trademark in conjunction with a work containing Open Game Content except as expressly licensed in another, independent Agreement with the owner of such Trademark or Registered Trademark.&quot; That means I can't release a product under the OGL and say it's for use with Dungeons &amp; Dragons – that's why the d20 STL used to exist as a separate license, and these days publishers instead use euphemisms like &quot;5e&quot; or &quot;the world's most popular RPG&quot;. But if I'm not using the OGL, there's nothing stopping me from saying my book is for use with D&amp;D. I probably can't use the D&amp;D logo, and I probably have to use some fine print to the effect of &quot;D&amp;D is a registered trademark owned by Wizards of the Coast blah blah&quot;, but indicating that your product is for use with another product is a commonplace thing. Depending on what else the book contains, I might be getting a nastygram from Wizards' lawyers for copyright violations, but indicating compatibility is not one of the things I'd get in trouble for.</blockquote>

[QUOTE="Staffan, post: 8474716, member: 907"] I'm not a lawyer, but open licenses in general (e.g. the OGL, Creative Commons, GPL, etc.) tend to be accepted by including them in the product itself, thereby stating "I am using this material under this license and accepting the terms thereof." But if I were to release a D&D supplement, I would not automatically be doing so under the OGL, and so I would not be bound by its terms. For example, one of the terms of the OGL is "You agree not to indicate compatibility or co-adaptability with any Trademark or Registered Trademark in conjunction with a work containing Open Game Content except as expressly licensed in another, independent Agreement with the owner of such Trademark or Registered Trademark." That means I can't release a product under the OGL and say it's for use with Dungeons & Dragons – that's why the d20 STL used to exist as a separate license, and these days publishers instead use euphemisms like "5e" or "the world's most popular RPG". But if I'm not using the OGL, there's nothing stopping me from saying my book is for use with D&D. I probably can't use the D&D logo, and I probably have to use some fine print to the effect of "D&D is a registered trademark owned by Wizards of the Coast blah blah", but indicating that your product is for use with another product is a commonplace thing. Depending on what else the book contains, I might be getting a nastygram from Wizards' lawyers for copyright violations, but indicating compatibility is not one of the things I'd get in trouble for. [/QUOTE]

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