[OhMeadhbh]

A bit of a nit-pick. 30 years ago was 1995. It was not a crime to use PGP in the US in 1995. What PKZ was charged with was exporting the encryption technology (or allowing it to export itself by putting the code on an anonymous FTP server.) The Bernstein case was similar in that it was the export of the machine-readable code the government objected to, not it's domestic distribution. The right for researchers to publish text describing algorithms had earlier been recognized by the court (which is why Martin Gardner could describe the RSA cryptosystem in Scientific American in 1977.)