the cable companies want to make sure that you are using their boxes and that they are not tampered with. So what they do is send a message to ur box asking a few questions and the box sends back the answers to the company. If the box is not theirs or it is tampered with they send a destory command. That command fries your box, making it useless. Directtv did it and fried the illegal smart cards. I have heard of cable companies do that too.
Of course if u don't want them to come in, that is your right.
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