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OMA File Extension - Open .OMA File (Sony OpenMG Audio File)
https://dotwhat.net/file/extension/oma/9696
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.
Sony MZ-N1: OpenMG Jukebox - Minidisc
http://www.minidisc.org/brian_youn/mzn1/page3.html
OpenMG tracks can be freely edited (divided, combined, etc), on the harddrive, but once you download a track to MD, you're stuck with it as-is. Tracks that are checked-out via the jukebox software are Track-Protected on the MD, and cannot be edited (aside from simple rename/move operations) nor be deleted. On the external device (MD) side:
OMA Converter: Convert ATRAC .OMA to MP3/WAV to Play OMA ...
https://www.techisky.com/how-to/oma-converter-convert-oma-to-mp3-onmac-windows.html
The OpenMG’s compliant software, Sony SonicStage (similar to iTunes, Windows Media Player and RealPlayer), is commonly used by Walkman users for managing the library of ATRAC OMG/OMA and MP3 recordings on a Windows PC and is capable of transcoding MP3, CD WAV files to OpenMG/ATRAC3.
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