On2

On2 Technologies is a video codec technology company, purchased by Google in 2010. On2 has made many proprietary codecs, and following their acquisition some were relicenced.

A summary of notable codecs created:

• VP3
  • Xiph.org created Theora as a fork
• VP6 - proprietary, used in Flash Video and others
• VP8 - open source
  • WebM format uses VP8 video with Vorbis or Opus audio