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Online pirates have targeted Duke Video's official review of the 2011 TT.
The DVD has been copied and made available for download on the internet's largest file sharing site.
Duke director Jon Quayle says, although it shows how popular the event is around the world, downloaders getting the DVD for free means there will be less cash to invest in coverage in the future.
Duke pays the Manx government for the rights to cover the event, and he says increased piracy means the company will have less money to support the festival:
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