COMMON sense is: this is the way that the world ALWAYS, ALWAYS has been, is and will be. I.E. the world is flat, the sun revolves around the Earth and humans were never meant to fly.
UNCOMMON sense is: this is the way the world has been and is but this is the way that I think it could be.
I know that this is obvious to most of you but, it never hurts to be said.
If you want to talk about this some more, I can be found at the DRM community board.