I have comcast on Demand and I was just browsing the on demand thing and i came across HBO on Demand and i went to watch a movie (accepted) and it came up as 'free with subscription'.. i wasnt sure if this meant i could watch the movie for free or I had to pay for it.. i wasnt prompted to pay for it when i clicked the watch button but when i paused the movie it said i was using some kind of rental time?? Basically, am i going to be billed for this movie or do i have HBO and dont know it?