This just doesn't seem like a terribly difficult problem. Web browsers have figured it out. Any webpage that isn't served over SSL says "Not Secure" right at

This just doesn't seem like a terribly difficult problem. Web browsers have figured it out. Any webpage that isn't served over SSL says "Not Secure" right at the top. I can think of a dozen ways which the OS could prominently display "Not Secure" for non-sandboxed applications, in a way that wouldn't preclude or hinder users from using such applications if they really wanted to.