According to this article, Amateur Radio is now transitioning from analog to digital voice. This is similar to the 1950’s – 60’s transition from AM to SSB it goes on to say. Suppose one company held the patent for SSB back then and forced you into their technology. Amateurs would be under their control indefinitely! As we all know, that is going on with digital voice right now.
Enter FreeDV. FreeDV is a GUI application for Windows, Linux and MacOS (BSD and Android in development) that allows any SSB radio to be used for low bit rate digital voice.