With iTunes 7.2, preview and purchase iTunes Plus musicnew higher-quality, DRM-free music downloads from participating music labels.
The iTunes Store also offers songs without DRM protection, from participating record labels. These DRM-free songs, called "iTunes Plus," have no usage restrictions and feature higher-quality encoding.
The first time you buy an iTunes Plus song, you specify whether to make all future purchases iTunes Plus versions (when available). You can change this setting by accessing your account information on the iTunes Store.
If you already have iTunes Store purchases that are now available as iTunes Plus downloads, you may upgrade your existing purchases. To do so, visit the iTunes Store and follow the onscreen instructions.