The all-important conclusion (which has yet to be reached) is to the question of whether APIs can be copyrighted. Up until now, all of our software licensing laws have operated under the assumption that APIs and header files are not copyrightable. At this stage it's expected that the status quo will be maintained, which is good for mostly everyone. If the judge were to rule otherwise, and the rule were to be enforced, many software licenses would need to be adapted, and a lot of messy things start happening for projects that provide compatibility with other APIs. As an example, something like GNUstep couldn't exist.