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FairPlay is built into the MP4 multimedia file format as an encrypted AAC audio layer. FairPlay-protected files are regular MP4 container files with an encrypted AAC audio layer. The layer is encrypted using the AES algorithm. The master key required to decrypt the audio layer is also stored in encrypted form in the MP4 container file.
Apple's iPhone supports AAC and FairPlay protected AAC files formerly used as the default encoding format in the iTunes Store until the removal of DRM restrictions in March 2009. Android 2.3 [67] and later supports AAC-LC, HE-AAC and HE-AAC v2 in MP4 or M4A containers along with several other audio formats. Android 3.1 and later supports raw ...
The data compression software for encoding into ALAC files, Apple Lossless Encoder, was introduced into the Mac OS X Core Audio framework on April 28, 2004, together with the QuickTime 6.5.1 update, thus making it available in iTunes since version 4.5 and above, and its replacement, the Music application. [8]
The 'Music' category is merely a guideline on commercialized uses of a particular format, not a technical assessment of its capabilities. For example, MP3 and AAC dominate the personal audio market in terms of market share, though many other formats are comparably well suited to fill this role from a purely technical standpoint.
Following the introduction of the iTunes Store, individual songs were all sold for the same price, though Apple introduced multiple prices in 2007. Music in the store is in the Advanced Audio Coding (AAC) format, which is the MPEG-4-specified successor to MP3. Originally, songs were only available with DRM and were encoded at 128 kbit/s.
An audio coding format [1] (or sometimes audio compression format) is a content representation format for storage or transmission of digital audio (such as in digital television, digital radio and in audio and video files). Examples of audio coding formats include MP3, AAC, Vorbis, FLAC, and Opus. A specific software or hardware implementation ...
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iTunes; Nero AAC Codec; VisualOn AAC Encoder (a.k.a. libvo_aacenc) Fraunhofer FDK AAC; libaacplus; MPEG-4 Audio. Advanced Audio Coding (AAC, MPEG-4 Part 3 subpart 4), HE-AAC and AAC-LD. FAAC, FAAD2; FFmpeg; iTunes; Nero AAC Codec; MPEG-4 AAC reference software (ISO/IEC 14496-5:2001) Harmonic and Individual Lines and Noise (HILN, MPEG-4 ...