These are respectively a coded and an uncoded form of the same key.

To make things even more complicated than they already are, the cryptedkey is often simply referred to as a key.

The cryptedkey contains a combination of the date, that key was sent, the plainkey and the Plainmasterkey, all coded into 1 key. The cryptedkey is sent to the card on a regular basis. It validates the subscription of the user, therewith enabling the user to view certain channels. The cryptedkey ensures correct decoding of a validated channel. The plain key is the uncoded version of the cryptedkey.