. . to force everyone to license a Microsoft proprietary protocol. If Microsoft can lure enough DVDs to their format (by promising unbreakable DRM), makers of players will be forced to license the Microsoft protocol so these disks can be played in their players.
There will probably be a two tier license, with a lower cost for devices that properly implement hardware for "encryption to the speakers" and can't be hacked to make digital recordings.
Microsoft sees how much the entertainment industry gets for a $0.50 CD or DVD, and sees no reason that profit shouldn't be theirs.
There is no vulnerability greater than greed, and the RIAA/MPAA companies specialize in greed. Microsoft intends to leverage that into total control of entertainment distribution in digital form.