Usage rights for iTunes Store purchases
Many of the items you purchase from the iTunes Store are protected by Digital Rights Management (DRM). These protected purchases can be:
Played on up to five computers
Synced with your iPod
Synced with or streamed to your Apple TV
All songs offered by the iTunes Store now come without DRM protection. These DRM-free songs, called iTunes Plus, haveÂ no usage restrictions and feature high-quality 256 kbps AAC encoding.
If you already have iTunes Store purchases that are now available as iTunes Plus downloads, you may upgrade your existing purchases.Â To do so, visit the iTunes Store and follow the onscreen instructions.