The problem with NDAs (which we do have) is that yes, you have legal recourse when someone violates them, but CF still has to invest considerable resources to exercise that legal recourse. At that point, the damage is done -- damage that CF would probably never fully recover from.

Considering there are prep lists complete with vnums (numbers only immortals can see) circulating on forums out there, I think everyone can understand why the CF code is protected by circles within circles.