Oracle has renewed its copyright clash with Google in a return trip to the U.S. Court of Appeals for the Federal Circuit. The software giant submitted its opening brief Friday from its unsuccessful trial bid to recover $8 billion for Google’s copying of Java application programming interfaces (APIs) into its Android operating system.

The Federal Circuit ruled in 2014 that the APIs are copyrightable and sent the case back to U.S. District Judge William Alsup for a second trial on whether the copying was a fair use. The jury found last year that it was after Google argued that it transformed Java into a mobile-friendly platform.