> Anyone can pick up some CAD software and design a house if they so desire. Is the town going to let you build it without a certified engineer/architect signing off? Fuck no. But we don't lock down CAD software.
No, we lock down using that output from the CAD software in the real world.
> And presumably, mission critical software is still going to be stamped off on by a certified engineer of some sort.
The "mission critical" qualifier is new to your analogy, but is irrelevant anyway - the analogy breaks because, while you can do what you like with CAD software on your own PC, that output never gets used outside of your PC without careful and multiple levels of review, while in the s/ware case, there is no review.
