Google Play Store, a judge ruled, upending the search giant’s dominance in the lucrative Android app market.A federal judge in San Francisco on Monday handed a big victory to Epic Games Inc. in its long-running antitrust challenge to the technology giant’s app store,

The injunction by U.S. District Judge James Donato in San Francisco outlined the changes Google must undertake to open up its lucrative app store, Play, to greater competition, including making Android apps available from rival sources.

A federal judge on Monday ordered Google to tear down the digital walls shielding its Android app store from competition as a punishment for maintaining an illegal monopoly that helped expand the company’s internet empire.