For a while now author has tried to figure out of Ogg Theora is a free and open standard according to included definition. Here is a short writeup of what he has been able to gather so far. He brought up the topic on the Xiph advocacy mailing list in July 2009, for those that want to see some background information. According to Ivo Emanuel Gonçalves and Monty Montgomery on that list the Ogg Theora specification fulfils the Digistan definition.
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