The 2nd US Circuit Court of Appeals in Manhattan ruled 2-to-1 that a lower court judge was right to find Apple Inc violated the laws to upset Amazon.Com Inc's control of the market.
The appeals court also agreed that US District Judge Denise Cote was right to order injunctive relief to ensure the Cupertino, California-based company didn't commit additional violations of antitrust laws.
An Apple lawyer said in an email that comment would be issued soon.
In a majority opinion written by Judge Debra Ann Livingston, the 2nd Circuit said Cote's finding that Apple orchestrated a conspiracy among publishers to raise electronic book prices was "amply supported and well-reasoned."
More From This Section
"We also conclude that the district court's injunction is lawful and consistent with preventing future anticompetitive harms," the appeals court said.
He said it was a mistake by Cote and his fellow appeals judges to assume "competition should be genteel, lawyer-designed, and fair under sporting rules, and that antitrust law is offended by gloves-off competition."
In the majority opinion, though, Livingston wrote that it was "startling" that Jacobs would agree Apple intentionally organised a conspiracy among publishers to raise e-book prices and then say the company was entitled to do so because the conspiracy helped it become an e-book retailer.
The US Justice Department and 33 states and territories originally sued Apple and five publishers. The publishers all settled and signed consent decrees prohibiting them from restricting e-book retailers' ability to set prices. Two publishers joined Apple's appeal.