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Message: <blockquote data-quote="Ranger REG" data-source="post: 279110" data-attributes="member: 533">There is no hard rule. I think when you look at your product and ask yourself, "If I see this on the stores and pick it up, will this product have the same feel as any other d20 product out there? Does it retain some of the famiiliar signature rules elements, like the abilities (Str, Dex, Con, Int, Wis, Cha) or the class/level markup?"If you have playtester ask them these same questions. Also ask if the playtester is also a d20, if there is any difficulty of learning your game.If you want to slap a d20 logo on your product, then by following the restrictions and limited use in the Guide, your product will retain the basic familiarity of the system.If you don't want to slap d20 logo but use the OGL, then there is no reason to retain some familiarity because most likely your product will be a complete, standalone game. Customers who pick up your product will have to learn the rules of your game because you're going to provide the instructions including a character creation rules (which would be a no-no if you're applying the above trademark license).</blockquote>