Google successfully made its case to a jury last year that its use of Java APIs in Android was “fair use.” A San Francisco federal jury rejected Oracle’s claim that the mobile system infringed Oracle’s copyrights.

But Oracle isn’t backing down. Late Friday, the company appealed the high-profile verdict to a federal appeals court.

This is the latest stage of a seemingly never-ending legal battle over intellectual property that began in 2010. The conflict has meandered through two federal trials, in addition to multiple trips to the appellate courts and to the Supreme Court.