I would add that unless data security is the default, it is ineffective. Moreover, it's demonstrably false that data security is hard on usability. Skype became

I would add that unless data security is the default, it is ineffective. Moreover, it's demonstrably false that data security is hard on usability. Skype became popular because easy-to-use data security made it possible to build a p2p communications product. Most users didn't know or care they were using encrypted communications.