What is the Samsung Smart TV CI module used for?

What is the Samsung Smart TV CI module used for? tv ci slot
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tv slot A common interface is designed for CI or CI+ modules to be inserted with a decoding card for

tv ci slot CAMs Conditional Access Modules used in satellite receivers with CI Common Interface slots in order to read subscription cards HomeSatellite TVCards & CAM Hi I can't find the CI+ slot on my TV KD-XH759005 It's wall mounted so I can't look behind it It's not where the USB and HDMI sockets are