YouTube was't an attractive target before Google bought them (no money). Now they are but they're using H.264 and presumably a full licensed toolchain for it, defended by a lot of industry players in addition to Google's deep pockets.<p>I hope that the VP3 heritage is truly patent free but right now it's hard to say anything is patent-safe given the wretched state of our industry. Theora, in contrast, is not defended by anyone powerful and thus far hasn't been worth going after; if it starts to get accepted I'd be surprised if one of the trolls didn't try for danegeld.