The Nagravision is basicly a code used for satellite companies that broadcast fee based television programming. Due to the fact that broadcasts can be picked up by almost anyone with a satellite dish, broadcasts are encoded, so that non paying customers can not view programming.
The roomer is that some boxes are able to view some channels encrypted using Nagravision 3 through a technique called "card sharing" whereby the encryption status of an existing paid subscriber card is disseminated to other receivers through the use of a networked connection. Many hackers in the underground FTA testing community are working hard to further crack this security implementation as they have done in the recent past with Nagravision 2. Current underground projects are limited to channels which can be subscribed to. Channels that are not available for subscription such as Special Events and Pay-Per-View programming have so far remained unavailable.
