Download the file from GNUPG website. GnUPG can be used for comercial sites without a license.

You will need shell access, i.e. telnet or SSH. SSH is more secure. Also a linux machine and a copy of PGP installed on your machine. You will also need to generate a key pair, this consists of a public and private key. The public key is uploaded to the server the private key is kept on your machine. See the PGP help file for more information.
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Decryption · Email · Encryption · GNUPG · PHP