myradale said:Thanks to everyone, especially Bront.
Can't figure why that would be propriatary.
Because in theory the SRD only gives everything except how to create and advance characters for the D20 system. The Core Books are supposed to be the primary reference for creating characters, and noting their need on the cover and omitting character generation rules allows a publisher to put the D20 logo on their cover. If one includes character creation rules, the product is technically under the OGL and not allowed to use the D20 logo.
I think.