Internal Program Version: libkate  0.4.1

Kate is an overlay codec, originally designed for karaoke and text,
that can be multiplixed in Ogg. Text and images can be carried by
a Kate stream, and animated. Most of the time, this would be
multiplexed with audio/video to carry subtitles, song lyrics
(with or without karaoke data), etc, but doesn't have to be.

http://libkate.googlecode.com