But nearly every digital music player can play back the more ubiquitous MP3 format, as can most home DVD players and car stereos (via MP3 CDs). A handful of player programs support AAC, but not some of the most commonly used Windows programs such as Windows Media Player. Aside from Apple’s offerings, Microsoft’s Zune, the SanDisk Sansa, several Sony devices (the PlayStation Portable, Walkman and some phones), the Sonos Digital Music Player, the Squeezebox, and some other devices can play back AAC files. (Contrary to what many believe, this is not a “proprietary” format owned by Apple, but rather part of the MP4 specification.) But not many devices support AAC. For the music files sold by Apple are in AAC ( Advanced Audio Coding) format. While this frees up iTunes Store purchases for playback on other devices, or with other software, there may still be a hurdle if you don’t use a compatible device, or if you want to use these files with Windows software. Currently, some 80 percent of music sold on the iTunes Store is without DRM, with the remainder to follow by the end of March. One of the biggest announcements made by Apple during the recent Macworld Expo was the news that, soon, all music sold by the iTunes Store will be free of digital rights management (DRM) restrictions.
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