Apple and Sony are being sued in France by UFC-Que Choisir, the major French consumer association, for breaking the law against bundle sales. The lack of interroperability beetween their DRM system and requirment to use their device is the reason.

Looks like Microsoft DRM system could benefit as they sell it to anyone who wants it, but nobody use it :-)

Source: Boing Boing, DLFP (fr).