If I was running any open source Linux distro I would sell the hell out of being able to audit and build the source code, and modify it to include voice encryption on phone devices that enable access to the audio path.

There has to be a huge government market for secure phones. VoLTE will do a lot to enable secure voice by enabling implementation of more of the audio path in the smartphone CPU.

Secure phones, tablets, PCs, routers, etc. all seem like a market poised to take off, yet I don't see a move by the 1st tier Linux distros.