The government had argued that Cook likely had relevant information about Apple's entry into the e-books market. It also said Cook likely had conversations related to e-books with former Apple CEO Steve Jobs, who died in 2011.
Apple had fought the request, saying Cook's testimony would be "cumulative and duplicative" since the government had already deposed 11 other executives at the iPad maker. However, U.S. District Judge Denise Cote in Manhattan granted the Justice Department's request to compel Cook to testify for four hours in the lawsuit. The lawsuit alleges that Apple conspired with five publishers to raise the prices on e-books.
Apple is the only remaining defendant in the lawsuit, which was filed in April 2012 in U.S. District Court in New York.