<blockquote>Indeed, compared to the list of companies with patents in the H.264 patent pool—the companies perhaps most likely to have patents covering WebM—and the lack of overlap is significant. Cisco, LG, and Samsung are members of both groups, but there are 26 other companies in the H.264 patent pool that have not yet joined the WebM initiative. These companies all have a vested interest in defending H.264's royalty payments, and their absence will leave some doubts over the significance of the consortium.</blockquote>
via <a href="http://arstechnica.com/web/news/2011/04/google-builds-webm-patent-pool-of-its-own-to-fight-back-against-mpeg-la.ars">Google builds WebM patent pool of its own to fight back against MPEG-LA</a>.