The KeyAgreeRecipientInfo.Version property retrieves the version of the key agreement recipient. This is automatically set for objects in this class, and the value implies that the recipient is taking part in a key agreement algorithm.
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The version determines whether the message in which this System.Security.Cryptography.Pkcs.KeyAgreeRecipientInfo object is contained is a PKCS #7 message or a Cryptographic Message Syntax (CMS) message. CMS is a newer superset of PKCS #7.