Sometimes people are complicated.
True.
Although I wonder if there's more to it. Is he afraid of some kind of legal issues with WotC due to the system he uses, when getting too much exposure to KotC?
Q: So I could make a game?
A: Sure. Remember though, you cannot use any Product Identity with the OGL or claim compatibility with anything. So you can't say your game is a d20 System game or uses D&D rules or call it Elminster's Undermountain Crawl.
...
In order to understand why Wizards of the Coast would create the Open Gaming License we need to start with primary principles. Marcus Aurelius said, "Of all things ask,
what does it intrinsically do?"
Dungeons & Dragons is a game, and in order for a game to fulfill its function it must be played. Yet one of the primary reasons people report leaving the hobby is because they can't find anyone to play with. To increase the chance of finding someone to play the game with, you need to increase the network of players. Previous
D&D business strategy promoted the use of aggressive legal strategies to keep anyone from publishing work that might be compatible with
Dungeons & Dragons. In hindsight, this approach only encouraged players to create new game systems for their genres. As a result, new players brought in through those game systems were playing a game that was incompatible with the
D&D system, which fragmented the paper-based roleplaying game genre.
The open gaming license (OGL) says, in a nutshell, that you can create any product you want using the core
D&D mechanic (what we call the d20 system). You can change any rule you want, you can add any rule you want, you can cover any subject you want. The only thing that you can't do is keep anyone else from using the
D&D rules you used or anything you derived from those rules. In other words, you can play with the blocks but you can't tell someone else that they can't play with the blocks as well. In exchange, you don't owe Wizards any money, and Wizards has no approval over your product
What does Wizards get out of this deal? In addition to expanding the network of
D&D players, we also created a little trademarked "bug" (logo you can put on products) called "d20." We own this little logo. We get to say who uses this logo and what they can and can't do if they want to use this logo. What this logo means is, "This product is made with the d20 rules system." Everyone in the gaming community has seen this logo and can now identify it, so it has recognition value.
If you want to put this logo on your product, there are some basic ground rules, a few things you must and must not do. You must point people to the
Player's Handbook, you must not present character creation rules, and you must use the basic terms of the d20 rules system unchanged (for example, Strength, Dexterity, Constitution, Intelligence, Wisdom and Charisma). Now, just to be clear:
You don't have to use the d20 logo on your product.You can simply use the Open Gaming License and ignore the whole d20 logo issue. But so far everyone who has produced a game has felt that the d20 logo is valuable enough to adhere to the few d20 rules.