PGP, or Pretty Good Privacy, is a data encryption and decryption program that provides cryptographic privacy and authentication for data communication. In i-net Clear Reports it is used for securing email communication.

Here's a brief rundown of how it works: PGP uses a combination of symmetric-key and public-key cryptography. Each user has a pair of keys - a public key that is shared openly and a private key that is kept secret. When someone wants to send you an encrypted message, they use your public key to encrypt it. Only you, with your private key, can decrypt and access the original message.

In the i-net Clear Reports PGP public keys are used to encrypt outgoing emails. If an email will be sent to multiple recipients, including users whose public keys we know for encryption and users who will not receive encrypted emails, then multiple emails will be sent.