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Continue to ChatDTG to submit D-Book into HbbTV spec https://www.broadbandtvnews.com/2012/09/08/dtg-to-submit-d-book-into-hbbtv-spec/
DTG to submit D-Book into HbbTV spec https://www.broadbandtvnews.com/2012/09/08/dtg-to-submit-d-book-into-hbbtv-spec/