My parents live down the street from me and have cable, I only have the lowest of basic cable. Like, 25 channels or something. Can I use one of the cable boxes from their house and just plug it into mine and get all their channels? Does the box do the decoding (since it's registered for their service), or is there a hookup outside that's done. Because if that's the case, then I could have them add another box to the house for like $6 and use that.