“the legislative scheme requires the Commissioner to receive and consider a complaint and then provides the Commissioner with a broad discretion as to whether to conduct a further investigation and, if so, to what extent. I would further hold,…. that having done that much the Commissioner is entitled to conclude that it is unnecessary to determine whether there has been an infringement but sufficient to reach and express a view about the likelihood that this is so and to take no further action. By doing so the Commissioner discharges his duty to inform the complainant of the outcome of their complaint.”