

I mean, amateur radio was illegal to encrypt
Was? I’m not familiar with a jurisdiction that presently allows licensed amateur radio operators to send encrypted or even obfuscated messages, with the unique exception of control-and-command instructions for amateur radio satellites. The whole exercise of ham radio is to openly communicate, with other frequencies and services available for encrypted comms and whatever else.
To be abundantly clear, I very much support encryption because it keeps good people honest and frustrates bad people. But it’s hard to see how, for ham radio, encryption could be reconciled with the open and inviting spirit that has steered the radio community for over a century. In a lot of ways, hams were doing FOSS well before the acronym came into existence.
I have great admiration for the radio operators, precisely because when all the major infrastructure falters, it takes only a battery and a wire up a tree to recover some semblance of connectivity.
(this is entirely tangential to the OP’s question, but I feel like hams deserve a good word every so often. Also, I understand that last weekend was ARRL Field Day in the USA)
In a nutshell, voices are not eligible for copyright protection under USA law, whose hegemony results in most of the world conforming to the same. The principal idea for copyright is that it only protects the rendition of some work or act. A writer’s manuscript, an artist’s early sketches, a software engineer’s source code, and a vocalist’s audition recording, are all things that imbue their creator with a valid copyright, but only for that particular product of their efforts.
It is not permissible to copyright the idea of a space opera, nor a style of painting, nor an algorithm for a computer routine, nor one’s own voice. Basically, pure thoughts cannot be copyrighted, nor things which are insufficiently creative like a copyright on the number 42, nor natural traits or phenomenon.
If we did change the law to allow the copyright of a human voice, then any satire or mockery that involves doing a good impression of someone speaking would suddenly be a copyright violation. This is nuts, because it would also deny someone else who – by no fault of their own – happens to have an identical voice. Would they just not be allowed to speak ever? Although intellectual property rights stem from the USA Constitution, so too do First Amendment speech rights, and the direct collision of the two would have strange and unusual contours.
For when ideas can be protected by law, see patents. And for when voices can be protected, see soundmarks/trademarks and brand rights, the latter stemming from rights of association. Such protections generally only hold when the voice or sound in question is an artificial product, like the sound of Ronald McDonald, and the protection only limits direct competitors from using the voice or sound improperly; everyone else is free to do impressions if they want.
So for the titular questions, the hypothesis posed simply will not occur under current law, and it’s hard to see how it would be practical if the law did permit it.