Who Must Show Consent in an Intellectual Property Infringement Case? Is the question asked by Oxford Professor and Intellectual Property Expert David Vaver.
Extract: "..a plaintiff who wants to show infringement of any intellectual property right must say that (1) the defendant is doing something only I am entitled to do, and (2) I have not given him any consent to do that. The plaintiff cannot get away with just saying (1) the defendant is doing something only I am entitled to do, but (2) I am not telling him whether I gave him consent or not: he has to tell me whether I did or not. That is neither good sense nor good law."