Compatibility
The CONNECT Music Store was only accessible via Internet Explorer on computers running the Microsoft Windows operating system.
Files downloaded from the CONNECT Music Store are encrypted using Sony's Digital Rights Management, in the OpenMG (*.omg & *.oma) file format. Audio content is encrypted using an OpenMG compliant program — SonicStage — and stored on a computer's hard disk for playback or transfer to a Sony media device. The file format is ATRAC3, Sony's proprietary compressed music format.
Sony claims that ATRAC3 has superior sound quality when compared to competing encoding formats, although this is disputed.
Read more about this topic: Sony Connect