My friends and I had a discussion about cable/satellite companies knowing what you are watching at every moment; not Big Brother, but for ratings information, such as how many people are watching. I said I didn't think they had that capability without some type of Neilson-type attachment. I did a search, but I could not find a definative answer;so, is it possible for satellite/cable companies to keep track of what you are watching and do they need your permission to do so?