Apple Inc. violated a court order requiring it to open up the App Store to third-party payment options and must stop charging commissions on purchases outside its software marketplace, a federal judge said.

The changes the company must now make could put a sizable dent in the double-digit billions of dollars in revenue the App Store generates each year

The judge in Epic v. Apple has banned Apple from charging a commission on purchases made outside the App Store because of its ongoing anticompetitive behavior.