Wikipedia’s decision to support Ogg Theora for video uploads may be the last chance to break the proprietary video monopoly embodied in H.264. Microsoft, Google and Apple have all built H.264 support into their products because it readily adapts to Digital Rights Management, without which studios and other video rights owners have been unwilling to make content available online.
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akf
15 years 10 weeks 3 days 13 hours ago
archive.org
Note that archive.org also has lots of Theora videos. But they don't use it exclusively.