Technology giant Apple and major book publishers are being sued by the US Department of Justice over the pricing of e-books.
The US accuses Apple and Hachette, HarperCollins, Macmillan, Simon and Schuster and Penguin of colluding over the prices of e-books they sell.
This lawsuit is over the agency model where publishers set the prices of e-books, rather than sellers.
The lawsuit comes a day after Apple surpassed $600bn (�379bn) in value.
The increase affirmed its position as the world's most valuable firm.
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