It seems that Tunebite allows Nokia’s DRM to be cracked. Tunebite has been around for a while so it’s not a new system.
Tunebite internally “plays” the DRM’ed music at high speed and converts the digital output back into a non-DRM file.
It’s very unlikely that Nokia can do much about this, it’s like plugging the output of the sound card in your PC back into a recorder (though there’s an analogue conversion there). Tunebite does the same thing, but in the digital domain.