Suppose you had a product that people liked to buy, but that some people just stole from you? Would your solution to the theft be to restrict how people who legitimately bought your product could do with it?
That's what the music industry is doing with DRM (Digital Rights Management). See, with the advent of CDs and digital music to be copied and shared, and the music industry doesn't like that. So, what do they do? They put DRM technology in all the music they sell legally. Well, I suppose it's theoretically a good idea, but...
DRM is annoying. Because of DRM, I can only listen to the album Spectators by Wolfsheim on iTunes. Which is all fine and well, as long as you're not running Linux. Oh, right, I am. Why should I buy music if I can't listen to it? I might as well just download it illegally.
Another problem with DRM is that it has no time limit. Copyrights don't last forever, but DRM (in theory) does. Which means, I still won't be able to listen to those files, even after the copyright on the music expires.
