That’s not to say that copyright infringement is morally justifiable. (Though some argue that it is.) As Green notes, it would be more appropriate to use “concepts like unauthorized use, trespass, conversion, and misappropriation” to condemn file sharing than “stealing” and “theft.” I’m not entirely convinced of that, either, since I doubt these terms mean anything at all to most people, even if they are more accurate, ethically speaking.