Cupertino distribuisce un codec con licenza open source. E' la stessa tecnologia lossless impiegata nei suoi device e su iTunes

Aqualung is a music player for the GNU/Linux operating system. It plays audio files from your filesystem and has the feature of inserting no gaps between adjacent tracks. It also supports high quality sample rate conversion between the file and the output device, when necessary. Almost all sample-based, uncompressed formats (e.g. WAV, AIFF, AU etc.) are supported. Files encoded with FLAC (the Free Lossless Audio Codec), Ogg Vorbis, Ogg Speex, MPEG Audio (including the infamous MP3 format) and MOD audio formats (MOD, S3M, XM, IT, etc.), Musepack are also supported.

Located here is a basic decoder for Apple Lossless Audio Codec files (ALAC). ALAC is a proprietary lossless audio compression scheme. Apple never released any documents on the format. What I provide here is a C implementation of a decoder, written from reverse engineering the file format. It turns out that most of the algorithms in the codec are fairly well known. ALAC uses an adaptive FIR prediction algorithm and stores the error values using a modified rice or golumb algorithm. Further details are in alac.c.