It seems I can publish my work under the Open Gaming License, and have it compatible with the D20 system being advanced primarily by Wizards of the Coast.

I’m very interested in this, it means that I can use D20 structure to build on for my setting, as long as all open gaming content is clearly marked.  Anything I release under Open Gaming License becomes part of that license and anyone can use it as long as they are publishing under the OGL.  I’m not too worried about that, because I’m already releasing this under Creative Commons – anyone is free to use it and make derivative works as long as the source is attributed.

If anyone out there knows much about D20 and OGL, please feel free to comment or contact me – I want to figure out how they work together, and how to best release this.  For now, see the copyright notice in the About the Setting page.

More to come as it comes to me.