sorry in advance if this is the wrong area, this is my first post here.
I am working with an RPG company that has a product that is ready for print, except for a Rules System. We are considering using a modified version of the OGL 3.5E D&D system. Is moding or hacking the OGL or SRD system legal? Can one change how rules work so long as one notes they are producing a different system using the Open Source doccuments? Can the subsequent material be published (with or without the D20 compatabillity logo) so long as the required legal doccuments were reprinted in the first three pages? I understand a forum is no substitue for a lawyer, but does anyone happen to know about this open source doccument off hand? Any help would be greatly appreciated. Thanks,
-Nathaniel