definiens: means any Know - How owned or Controlled by Enanta or any of its Affiliates relating to theLicensed Compounds that is reasonably necessary or useful for the research, Development, manufacture, Commercialization, use, importation or sale of Licensed Compound(s ) in the Field and in the Territory and that is notgenerated solely or jointly by Enanta or its Affiliates in the course of performance of the Research Program . However, Enanta Know - How shall not include Know - How owned or Controlled by Enanta or its Affiliates to the extent notrelating to NS5A Compounds, including Know - How directed to combination therapies, and which is or may be orbecome owned or Controlled by Enanta or its Affiliates, and which is or may become exclusively licensed to ThirdParties in connection with collaborations regarding proprietary compounds directed to HCV - relevant targets other thanNS5A