"Contrary to what the brief says, interfaces are meaningfully different from implementations; this is first-semester computer science. The [Solicitor General's] office didn't have to mush them together to make its argument that this case should be dealt with through fair use rather than through copyrightability. That it did so raises the concern that the DOJ is giving advice on a technology it doesn't understand. And given how important software is to the economy, that's truly frightening." — James Grimmelmann, Professor of Law, University of Maryland