To be able to enjoy TV content of paid satellite providers, you need a subscription with them. This will comes in a form of an official Smart Card. You put this card on your digital receiver box with the smart card reader feature and wallah! channels get descrambled. Now what if you could use this card to supply multiple digital satellite boxes?
In Cardsharing, there are providers with multiple card ID`s known as CAID. From provider or client point of view, some CAID`s are not working as good as they should. So some get "prioritized" and others "ignored".