A federal judge on Wednesday ruled Apple conspired with book publishers to raise e-book prices when the it entered the market in 2010.
Manhattan Judge Denise Cote says the evidence in the case left no doubt Apple broke anti-trust laws.
She says Apple knew no publisher could risk acting alone against Amazon.com's $9.99 price for the most popular e-books, so the company, "created a mechanism and environment that enabled them to act together in a matter of weeks to eliminate all retail price competition for their e-books."
The government previously reached settlements with five publishers.
Apple denies it fixed prices and says it will keep fighting the charges.
Another trial will determine whether Apple has to pay any damages.