Rocker Keith Richards' upcoming autobiography has sparked a multi-million publishing rights battle. Bidding for The Rolling Stones star's life story has reached $7.1 million (GBP3.55 million), according to publishing industry insiders. HarperCollins and Little, Brown, are the major publishing houses vying for the book, according to NewYorkBusiness.com. Richards has started work on his memoirs with longtime friend and author James Fox.