Last week, Google announced that its Youtube service would default to using HTML5 video instead of Flash. Once upon a time, this would have been cause for celebration: after all, Flash is a proprietary technology owned by one company, a frequent source of critical vulnerabilities that expose hundreds of millions of Internet users to attacks on their computers and all that they protect, and Flash objects can only be reliably accessed via closed software, and not from free/open code that anyone can inspect.