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my team lead at work is trying to move us off of pgp to entirely gpg and part of that is figuring out what keys are installed in pgp and because of some weird idiosyncrasy we have to have the current pgp installed alongside pgp 1.6 and he said that it might be illegal to have that one and i had no idea what he was talking about.
turns out the guy who wrote pgp was charged with unauthorized munitions export by the united states government because the encryption was so strong that in 1991, 128-bit encryption was considered "munitions grade"
he got out of it, and while it doesn't say because of this, it says his defense was to argue that if he published the source code for pgp in a book that would be protected under free speech & a protected freedom and anyone in the world could get it if they took that book and typed it into a computer
and the best part is that i believe this led to the us government having cryptographic compliance regulation that lasted into the 2000's of "you have to publish your source code for your encryption software"