Bob I expect better from you and On the Media. You said: "Do we have any idea what percentage of YouTube videos are copyrighted versus user generated stuff?" Which is just plain incorrect. Thanks to the US adoption of the Berne Convention Implementation Act there are no longer any requirements to copyright a work so all works are de-facto copyrighted. It would have been more appropriate to say what "percentage of works might be infringing works as opposed to ones uploaded by their copyright holder"
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