definiens: shall mean a field in which Hansen receives nonexc lusive rights and in which Hansen may exercise its rights to buy back IP from [COMPANY] if [COMPANY] fails to satisfy the Marke ting Requirement for such field, pursuant to Section 4 . The Buy Back Fields include : [ * * * ] For the avoidanc e of doubt, if Hansen or SPE exercises its buy back righ ts under Section 4.2 with respect to a particular B uy Back Field, [COMPANY] shall retain its rights hereunder or under the SPE - [COMPANY] Agreement within the SDOF Me dical Robotics Field for all other Buy Back Fields for wh ich Hansen or SPE has not exercised its buy back ri ghts under Section 4.2 and for all activities licensed h ereunder or sublicensed under the SPE - [COMPANY] Agree ment within the SDOF Medical Robotics Field that are out side the Buy Back Fields