definiens: means ( a ) with respect to any Royalty due pursuant to Article 3, the term during which the Royalty shall be payable as agreed by the Parties in writing in connection with the a pproval of the Commercialization Plan of the Development Proje ct Plan, ( and if there is not such an agreement reg arding the term which is so documented at such time, such term will be perpetual unless and until otherwise a greed by the Parties in writing ), or ( b ) with respect to any Royalty due pursuant to Article 6, on a country by country basis, the period commencing as of the date of Firs t Commercial Sale of the applicable Compound or Pro duct and ending on the expiration of the last - to - expire Valid Claim claiming the applicable Compound or Pro duct, or the manufacture ( including manufacturing process ) o r use thereof, which, but for the applicable licens e granted, would be infringed by the manufacture ( including ma nufacturing process ), use or sale of such Compound or Product, as applicable in the country of sale ( at t he time of use or sale ) or manufacture ( at the time of manufacture ) . At the end of the Royalty Term for any Royalty due pursuant to Article 6, if the licensed Party wants to continue to use the other Party ’s propriet ary trade secrets and know how in connection with t he at - issue Product, the Parties shall negotiate a royalty and royalty term for an extension of the applicable lic ense in good faith