Google is shifting Android to use OpenJDK rather than its own Java implementation which used a reimplementation of Java based on the proprietary header files of the proprietary Java implementation.

This concrete result is good for the free software community, but the idea that a compatible implementation of an interface spec might infringe the copyright on header files is very very dangerous. Fortunately, the appeals court that made this decision hears copyright cases only in very rare circumstances.

The FSF urged the Supreme Court not to consider the appeal because we feared it might sustain the appeal court's ruling, which would extend this bad decision to the whole US.