: These are used to decrypt Entitlement Management Messages (EMMs) . These messages are sent over-the-air to tell your receiver which channel packages you are allowed to watch.
: Utilizes a custom version of VideoGuard integrated directly into their set-top boxes. videoguard keys
The encryption process relies on a multi-layered hierarchy of keys to prevent unauthorized access: : These are used to decrypt Entitlement Management
: One of the most widespread users of the digital VideoGuard system. videoguard keys
: Every authorized receiver or smartcard contains a unique keycode. This key is specific to that hardware and cannot be used with other receivers.