Enhancements by Certegy. (a) Unless Exhibit J provides otherwise, Certegy, or the respective Designated Certegy Member, shall own all the modifications and improvements to, and the Certegy Enhancements and/or Derivative Works made from, the Licensed Equifax Materials developed by any member of the Certegy Group, or by any party other than a member of the Equifax Group at the expense of the Certegy Group. Equifax hereby assigns, and shall cause each member of the Equifax Group to assign, to Certegy, or the respective Designated Certegy Member, all right, title and interest it may hold in and to such modifications, improvements, Certegy Enhancements and Derivative Works. Certegy shall, or shall cause the respective Designated Certegy Member to, have the right to make and file all applications and other documents required to register the copyright(s) and file for patents for such modifications, improvements, Certegy Enhancements and Derivative Works in its discretion and at its sole cost and expense. (b) Should Certegy elect to file any application for the registration, perfection or protection of any modifications, improvements, Certegy Enhancements or Derivative Works described in Section 4.2(a), under any copyright, patent or other law of any country or jurisdiction, Equifax will, at the request and expense of Certegy, do all things and sign all documents or instruments reasonably necessary in the opinion of Certegy to assist in the registration of such claims, file such applications, and obtain, defend and enforce such copyright, patent, mask work and other rights. (c) Subject to the license rights granted in Section 4.1, as between the parties. the Licensed Equifax Materials shall be and shall remain the sole and exclusive property of the Equifax Group and the members of the Equifax Group may make any internal use and may commercially exploit any enhancements to the Licensed Materials made or