
Pretty Good Privacy uses a variation of the public key system. Implementations of the OpenPGP specification now often refer to their implementations of the protocol as Pretty Good Privacy or simply PGP. The Pretty Good Privacy trademark was abandoned as of April 2020. In 2015, it was reported that Zimmermann no longer used PGP because working versions were not available for any of his devices.
PRETTY GOOD SOLITAIRE REGISTRATION KEY LICENSE
The GNU Privacy Guard (GPG) implementation is published under the GNU Public License (GPL). Both open source and commercial implementations of the OpenPGP protocol are widely available.

While it may no longer be simple to acquire a new copy of the original PGP program, the Internet Engineering Task Force ( IETF) has published PGP protocols as internet standards since 1996. Other companies that have marketed some or all of the PGP technologies include the following: Zimmerman originally owned PGP, and later PGP Inc., the company he founded to market PGP, took over ownership. Ownership of the program shifted several times before its eventual demise. The original freeware and commercial versions of PGP are no longer available.

Zimmermann in 1991, it was once the most used privacy program and a de facto email encryption standard. PGP was initially brought out as freeware and later as a low-cost commercial product.

PGP now commonly refers to any encryption program or application that implements the OpenPGP public key cryptography standard. Pretty Good Privacy or PGP was a popular program used to encrypt and decrypt email over the internet, as well as authenticate messages with digital signatures and encrypted stored files.
