Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online. Four versions of Nagravision are in common use for digital satellite television, known as Nagravision, Nagravision Cardmagedon, Nagravision Aladin and Nagravision Merlin. Nagravision Cardmagedon and Aladin are often confused with each other and used under the term "Nagravision 2" which technically does not exist. Nagravision Cardmagedon is, however, a complicated combination of Nagravision Aladin and Mediaguard SECA 2 encryption. Nagravision Merlin is also known as Nagravision 3. The decryption unit is either integrated into a receiver, available as a conditional access module (CAM), or as one of many encryption schemes supported on a CAM emulator.

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