Apple Inc.  Prior to March 2009, digital music files with digital rights management were available for purchase from the iTunes Store, encoded in a proprietary derivative of the  AAC format that used Apple's FairPlay DRM system.
<meaning-changed> Apple Inc.  Prior to March 2009, digital music files with digital rights management were available for purchase from the iTunes Store, encoded in a proprietary derivative of the  AAC format that used Apple's FairPlay DRM system.
Apple Inc. Prior to March 2009, digital music files with digital rights management were available for purchase from the iTunes Store, encoded in a proprietary derivative of the Advanced Audio Coding| AAC format that used Apple's FairPlay DRM system.