CI Card?

[Mr.Orb]

Hi guys,
On the side of my Samsung LE26R74BD there is a CI (common interface) card solt. What on earth is it for? I tried google but couldn't find anything.

Thanks,
Mr.Orb

 

[kidloco]

my HDTV has a card slot in it, thats for stuff like top up tv

 

[Mr.Orb]

Is it just for Top-Up tv?