6.5.2 For purposes of this Section 6.5, “Patent Challenge” means any action against Licensor or the REGENXBIO Licensors, including an action for declaratory judgment, to declare or render invalid or unenforceable the Licensed Patents, or any claim thereof.
6.6 Effects of Termination. The effect of termination by Licensee pursuant to Section 6.2, by either Party, as applicable, under Section 6.3, or by Licensor pursuant to Section 6.4 or 6.5 shall be as follows; provided that for any termination with respect to either the ALS Field or the RETT Field (and not both Fields), then the following provisions shall apply only with respect to such terminated Field:
6.6.1 The licenses granted by Licensor hereunder shall terminate, and Licensee, its Affiliates, and (unless the sublicense agreement is assigned pursuant to Section 6.6.2) all Sublicensees shall cease to make, have made, use, import, sell, and offer for sale all Licensed Products and shall cease to otherwise practice the Licensed Technology; provided that Licensee shall have the right to continue to sell its existing inventories of Licensed Products for a period not to exceed **** after the effective date of such termination;
6.6.2 If termination is by Licensor pursuant to Section 6.3, 6.4, or 6.5, then, at Licensor’s request, Licensee shall assign to Licensor any or all sublicenses granted to Third Parties to the extent of the rights licensed to Licensee hereunder and sublicensed to the Sublicensee; provided that (i) prior to such assignment, Licensee shall advise Licensor whether such Sublicensee is then in full compliance with all terms and conditions of its sublicense and continues to perform thereunder, and, if such Sublicensee is not in full compliance or is not continuing to perform, Licensor may elect not to have such sublicense assigned; and (ii) following such assignment, Licensor shall not be liable to such Sublicensee with respect to any obligations of Licensee to the Sublicensee that are not consistent with, or not required by, Licensor’s obligations to Licensee under this Agreement; and all sublicenses not requested to be assigned to Licensor shall terminate. If termination is for any other reason, then all sublicenses shall terminate;
6.6.3 If termination is by Licensee pursuant to Section 6.2 or by Licensor pursuant to Section 6.3, 6.4, or 6.5, Licensee shall grant, and hereby grants, to Licensor a non-exclusive, perpetual, irrevocable, worldwide, royalty-free, transferable, sublicensable license under any patentable modifications or improvements (and any intellectual property rights with respect thereto) developed by Licensee, any Affiliates, or any Sublicensees to any vector that is the subject of a claim within any of the Licensed Patents, for use by Licensor for the research, development, and commercialization of products in any therapeutic indication;
6.6.4 Licensee shall pay all monies then-owed to Licensor under this Agreement; and
6.6.5 Each Receiving Party shall, at the Disclosing Party’s request, return all Confidential Information of the Disclosing Party. Notwithstanding the foregoing, one copy may be kept by either Party for a record of that Party’s obligations.
6.7 Survival. Licensee’s obligation to pay all monies due and owed to Licensor under this Agreement which have matured as of the effective date of termination or expiration shall survive