Common Interface – co to jest?

common interface slot does on the back of my TV Would I be right in thinking you could add specific viewing cards to it lets say for

COMMON INTERFACE FOR SAMSUNG TV CI CARD ADAPTER Watch paid channels by inserting your TV viewing card into the COMMON INTERFACE slot

common interface slot Compatible CI+ kaart adapter geschikt voor Samsung televisies Ter vervangingen van een defecte of zoekgeraakte interface adapter Push, Common Interface, 5V

common slot what is a common interface slot ? and whats it doing on a plasma ? answers on a postcard please or post below cheers