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Originally Posted by Lynx-lynx
My understanding is that there's no drm on mp3 music, so how have the powers that be reduced piracy for that medium?
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Not true at all. There are multiple MP3 encumbering methods. None of them are formally part of the MPEG-1 Layer III specifications but they do exist.
Edited to elaborate: most MP3 DRM schemes don't encrypt the files but they do embed some form of identifier or watermark in the files so that they can be recognized as yours. I'm sure someone has done some kind of encrypted wrapper around MP3 files but I can't name any specifics off the top of my head. Most either went WMA with Microsoft's DRM or Apple's M4A with FairPlay.