Kiss Technology A/S (
http://www.kiss-technology.com/) is a company making DVD players which can play a lot of formats (DivX, mp3, ogg, whatever).
According to the Mplayer homepage (
http://www.mplayerhq.hu/homepage/design6/news.html#kiss01
) they have included code from MPlayer (which is licensed under GPL) into their products without releasing the complete source code.
I thought that a danish company would have known better...
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update: corrected urls
