I recently purchased and downloaded a pack form direct song and want to convert them into an mp3 format, from what I could observe they're one time only license and I checked here after I had already accepted it. When I try to convert any of the songs to DRM free with FairUse4WM it says that they require a different private key. I wasn't sure what that meant so I checked around and found something about ECC key pairs and extracting but I'm not sure about that either, could anyone help?