For Daala, they've purposefully avoided 'technologies' that have been used by other codecs before. This severely reduces the risk of coming across such a patent

For Daala, they've purposefully avoided 'technologies' that have been used by other codecs before. This severely reduces the risk of coming across such a patent. Xiph also apply for patents themselves, to ensure it's protected for the future. Below is an introductory video about daala, that talks about this a bit. https://www.youtube.com/watch?v=Dmho4gcRvQ4 https://www.youtube.com/watch?v=Dmho4gcRvQ4