In the Google vs Oracle appeal, a federal circuit court repealed the 2016 ruling that Google didn't owe Oracle anything for using Java in Android. Uh oh.

All Android operating systems infringe Java API packages, Oracle says Judge asked to block "continued acts of infringement of the Java platform." ...

That three percent included packages, methods, and class names. But those declarations—like starting a function with package java.lang —can only be used in certain ways.