If I buy a movie ticket, that doesn't give me a right to download the movie, or get a discount on the DVD, even though I "paid for a license" to that content. (to view it once, in a movie theater). Likewise when buying a CD, you are purchasing a license to experience that content in exactly the way the seller intended. Again I emphasise, this is not necessarily the law, this is just how the MPAA/RIAA seem to view the situation.