I haven't read the whole opinion yet, but it seems to be arguing that works produced in the course of a legislative function are not authored, and therefore not

I haven't read the whole opinion yet, but it seems to be arguing that works produced in the course of a legislative function are not authored, and therefore not copyrightable. It doesn't seem to have much to do with the content relating to the law or not. And if so, what is the larger significance?