To remove DRM features from a WMA file, you will need a drm remover software that plays the WMA file and re-records it in another format. Using Melodycan you can also remove DRM from WMA files. It also works well with napster and rhapsody forms of drm.

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How can you tell the rain not to fall when clouds exist?
How can you tell the leaves not to fall when the autumn exists?
How can you tell me not to fall in love when you exist?
I ♥ ♪ ツ