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 caused to be made by members of the Equifax Group, as they shall deem appropriate without any obligation to any member of the Certegy Group or other restriction. The Equifax Group may in particular distribute and manufacture, or cause to be manufactured or distributed by any third party, any such enhancements and/or the Licensed Equifax Materials. Section 4.3. License to Marks. (a) Equifax hereby grants, and will cause each member of the Equifax Group to grant, to Certegy and each member of the Certegy Group a fully paid, non- exclusive, worldwide, non-transferable right to continue to use the Equifax Marks employed in the Certegy Business, but only to the extent such Equifax Marks were displayed by the Certegy Group prior to the Distribution Date (i) on the Transferred Equifax Assets, (ii) on premises jointly occupied with Equifax, and (iii) on letterhead, product and services documentation, invoices, software programs, packaging and similar materials used by the members of the Certegy Group, and such Equifax Marks are used in accordance with the guidelines for usage of the Equifax Marks published and amended by Equifax from time to time. Certegy will terminate the use of such Equifax Marks as soon as commercially practical but in any event within twelve (12) months after the Closing Date. (b) Certegy hereby grants, and will cause each member of the Certegy Group to grant, to Equifax and each member of the Equifax Group a fully paid, non- exclusive, worldwide, non- 14 transferable right to continue to use