As will be made clear in this Part II, resolution of the licensor???s dilemma, made all the more necessary by the MedImmune holding, is not to be found through an analysis of MedImmune, but requires a review (as provided in Part III of this Article) of the history of the doctrine of licensee estoppel and of relevant pre-MedImmune U.S. case law, in particular the Court???s seminal holding in Lear v