What is the purpose of a Ci slot on a TV?

What is the purpose of a Ci slot on a TV? tv ci slot In Digital Video Broadcasting, the Common Interface is a technology which allows decryption of pay TV channels Pay TV stations want to tv slot games DVB-CI defines an interface between a DVB receiver and a PC-Card module It

tv slot games The CI-extension for SkyStar HD is the prerequisite for the de-coding of Pay-TV stations The link to the TV-card takes place via the flat ribbon cable supplied

tv slot TV with built in satelite tuner which has a CI+ card slot that takes a CAM and smart card? Or is this CI card slot useless for this purpose Freenet TV 89997 Common Interface module Internal