Yahoo announced this week that they plan on shutting down their DRM servers on September 30th and you will no longer be able to reauthorize any files you purchased legally (if you, for example, buy a new computer some time in your life or reinstall Windows or something like that).
Once the Yahoo store goes down and the key servers go offline, existing tracks cannot be authorized to play on new computers. Instead, Yahoo recommends the old, lame, and lossy workaround of burning the files to CD, then reripping them onto the computer. Sure, you'll lose a bunch of blank CDs, sound quality, and all the metadata, but that's a small price to pay for the privilege of being able to listen to that music you lawfully acquired. Good thing you didn't download it illegally or just buy it on CD!
And
as a lawyer from the EFF points out, this isn't a great idea because...
What is worse, this suggestion could put customers at legal risk, as they may not have documentation of purchase. Furthermore, there is no certainty that all relevant copyright owners would agree that making such backup copies without permission is lawful.
So, if you end up getting sued by the RIAA at some time in the future, and you have all those MP3s you ripped through this workaround-CD-loophole, they could end up being used against you as evidence that you're a pirate. Arrrgh!
And
this is why DRM is a very, very, very, very bad idea. How do you trust that those companies are going to be around in 5, or 10, or 25 years? Or even if they are, will they support the old files still on new hardware and software, or would they rather you just purchase it again with whatever new hairbrained file scheme they have in the future?
Makes you glad you bought them legally, eh?