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10 years after its release, Philip Zimmermann remembered why he wrote PGP and published it on the Internet as a free and open source software program in June 1991.
https://www.philzimmermann.com/EN/essays/WhyIWrotePGP.html
Critical Commentary
10 years after its release, Philip Zimmermann remembered why he wrote PGP and published it on the Internet as a free and open source software program in June 1991.