Internal Program Version: Theora  1.1.1

Theora is a free and open video compression format from the Xiph.org 
Foundation. Like all our multimedia technology it can be used to 
distribute film and video online and on disc without the licensing 
and royalty fees or vendor lock-in associated with other formats.

Theora scales from postage stamp to HD resolution, and is considered 
particularly competitive at low bitrates. It is in the same class as 
MPEG-4/DiVX, and like the Vorbis audio codec it has lots of room for 
improvement as encoder technology develops.

Theora is in full public release as of November 3, 2008. The bitstream 
format for Theora I was frozen Thursday, 2004 July 1. All bitstreams 
encoded since that date will remain compatible with future releases.

The package contains the library that can decode and encode Theora streams. 
Theora is also able to playback VP3 streams.

http://www.theora.org