
A
Conditional Access System is an electronic system that aims to restrict the viewing of premium television content to paying subscribers only. There are many different Conditional Access Systems. Generally speaking a Conditional Access System will require a receiver/STB, with an appropriate
Conditional Access Module (CAM) armed with the correct smart card. There are a wide varieties of encryption systems used to protect digital TV content from unauthorized viewing, such as
Nagravision,
Viaccess,
MediaGuard,
Conax and
KeyFly, with a variable level of reliability from a security perspective.