We download a lot of TV shows and although they are quite often labeled as HD that is not what arrives. Those network downloads seem to adjust for the available bandwidth. When we download from Dish, quite often it will start two downloads, one fast and nasty 120-200MB and one HD 750MB-iGB. I know little about video but I have the feeling it takes huge bandwidth to get true HD. We usually try to clean them up a bit with conversion but I suspect that is really mostly a case of "garbage in, slightly less smelly garbage out".