The OMA extension indicates a compressed audio file created with Sony’s Adaptive Transform Acoustic Coding. Commonly referred to as ATRAC, the compression algorithm was developed by Sony and first used for commercial purposes in 1992.
The OMA format is used for files encrypted with OpenMG, a SDMI compliant DRM (Digital Rights Management) system developed by Sony. OMA files were used by Sony for selling music online through the Connect Music store which was shut down in 2008. They may contain Digital Rights Management Protection to prevent playback on unauthorized devices.
Audio data contained by OMA files is compressed to approximately 1/20 the data rate of a CD track. Even though they are considerably smaller, the loss in perceptible quality remains minimal.
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