Hardware DivX player

Mitashi has introduced hardware DivX players in India for Rs. 4,600. Its uprising that there seem to be so few hardware DivX players around, but there is a whole bunch of ICs available to playback DivX.

I still havent quite figured out the difference between MPEG-4 and DivX. Or, for that matter if there is any difference between them. Someone please explain it to me. Perhaps the difference is just the license.