Apple has addressed a security hole in the iTunes Music Store that made it possible to purchase songs that did not immediately feature anti-piracy protection.

The hole was being exploited by DVD Jon (Jon Johansen), famous for breaking the encryption software that protected and localized DVDs. He found a way of buying DRM-free tracks because the iTunes Music Store didn't add the digital rights management tag until after a track had been bought and downloaded.

Apple released a statement yesterday saying: "The security hole in the iTunes Music Store which was recently exploited has been closed, and as a consequence the iTunes Music Store will now sell music only to customers using iTunes version 4.7."