Band on the Run, you bring up another related problem: digital ownership. When you pay for and download a piece of music or a video, you're paying for a license -- not for ownership. If you buy a cd or dvd, you own the plastic. But they don't want you to resell or give away that piece of plastic without giving the original producers yet another cut of the money.
And, if you take a cd you bought and paid for to your place of business so you can listen to it while working, there's another organization that will come along and demand you pay royalties each year for listening to it at work. I know - I paid those damn royalties every year when I owned a coffee bar, even though I was playing cds I owned and had already paid for.