HinterWelt said:
Um, yeah, that is what I am saying. Like claiming your book is compatible with 3.5. You would need the STL...So, how is this logo not violating the compatibility clause? Again, I hope you prove me wrong here as I would love to claim compatibility with with d20 on some of my books.
Goblinoid Games said it pretty well, but I'll try again.
1) IANAL. Needs to be said for clarity.
2) The OGL forbids using PI to indicate compatibility without a separate agreement.
3) "3.5" is not PI. It's not anything. It has an implied meaning to you and to alot of other gamers because we're accustomed to thinking "3.5 Edition Dungeons & Dragons", but "3.5" by itself has no meaning. It could be a computer language. It could be a Shadowrun variant. It's essentially the same as "Compatible with the World's Most Popular RPG" or "Compatible with the 3.5 Edition of the World's Most Popular RPG" (both of which I've seen on OGL products) - D&D is -implied-, but not stated. Implicit, not explicit.
4) d20 is product identity. You can't indicate explicit compatibility with "d20" without the d20 STL. But, again, 3.5 does NOT equal d20, just as "World's Most Popular RPG" does NOT equal D&D.
5) Runequest is also PI (I assume). You couldn't just go and create an OGL:Runequest logo. HOWEVER, Mongoose could certainly create a Runequest STL that allowed you to use exactly such a logo. Action! could do likewise. True20, as of a week or so ago, allows you to say something like "compatible with True20" and use a True20 logo (see the website for details). They could easily add this as a variant logo - OGL:True20 Compatible.
I think you're assuming any reference to D&D, however veiled, is off-limits, and that's not the case. It might be the moral or ethical case, but it's not the legal case.
Here are the PI terms from the SRD - note there is absolutely no reference to edition in any of them:
Dungeons & Dragons, D&D, Player’s Handbook, Dungeon Master, Monster Manual, d20 System, Wizards of the Coast, d20 (when used as a trademark), Forgotten Realms, Faerûn, proper names (including those used in the names of spells or items), places, Red Wizard of Thay, the City of Union, Heroic Domains of Ysgard, Ever-Changing Chaos of Limbo, Windswept Depths of Pandemonium, Infinite Layers of the Abyss, Tarterian Depths of Carceri, Gray Waste of Hades, Bleak Eternity of Gehenna, Nine Hells of Baator, Infernal Battlefield of Acheron, Clockwork Nirvana of Mechanus, Peaceable Kingdoms of Arcadia, Seven Mounting Heavens of Celestia, Twin Paradises of Bytopia, Blessed Fields of Elysium, Wilderness of the Beastlands, Olympian Glades of Arborea, Concordant Domain of the Outlands, Sigil, Lady of Pain, Book of Exalted Deeds, Book of Vile Darkness, beholder, gauth, carrion crawler, tanar’ri, baatezu, displacer beast, githyanki, githzerai, mind flayer, illithid, umber hulk, yuan-ti.