When Ryan Dancey set up the OGL and the d20 System license (which allows people to use the Dungeons & Dragons rules system for free), he relied on the idea that a game isn’t just a set of rules. It’s a network of people who know and play the game. When you buy a copy of a game, you’re buying into that network.
The larger the network, the more valuable it is. Dungeons & Dragons already had the largest roleplaying game network around, but the d20 System license cemented its position by letting any publisher or fan legally tap into the network (and, by doing so, growing the network too).
One perhaps unforeseen side-effect of this is that anyone who publishes OGL/d20 System material produces a commodity, defined in economic terms as “a physical substance which is interchangeable with another product of the same type.”
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