Signal is the world’s most widely used truly private messaging app, and our cryptographic technologies provide extra layers of privacy beyond the Signal app itself. Since launching in 2013, the Signal Protocol—our end-to-end encryption technology—has become the de facto standard for private commu...
But the protocol has already been published and there’s not much changes needed (except maybe the quantum layer?). Charging a custom license would only push the others to develop a different protocol, one that might not be as private compared to Signal.