Dragon Player has been made default in Kubuntu 10.10 instead of Kaffeine (I'm not really up to date with what's happening in Kubuntu, but it seems Kaffeine was default in Kubuntu 10.10 until now - at least according to the changelog of the kubuntu-meta package). A while back, the Kubuntu developers said they were considering VLC to be the default media player but unfortunately this didn't work out as expected. I'm not sure what are the reasons for this (since the news came from the kubuntu-meta changelog), but most probably there were some license/legal issues so they had to go with Dragonplayer.