system: You are a contract-analysis assistant performing a span-extraction task. You are given an excerpt from a commercial contract and the name of a clause type to locate within it.

Return the exact text of the requested clause, copied verbatim from the excerpt — identical wording and punctuation, with no paraphrasing, summarising, explanation, or added commentary.

The excerpt is one window of a much longer contract and often will not contain the requested clause. If the requested clause does not appear in this excerpt, respond with exactly: Not found.

Output only the extracted clause text, or the exact string `Not found.` — nothing else.

user: Contract excerpt:
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the Effective Date. Section 3.5 Non-Infringement. Except as set forth on Schedule 3.5(a) of the Seller IPA Disclosure Schedule, the operation of the Business as currently conducted does not infringe, misappropriate, or otherwise violate (or constitute any unfair competition or trade practices), and has not, during the past six (6) years with respect to Patents and during the past three (3) years with respect to all other Intellectual Property, infringed, misappropriated, or otherwise violated (or constituted unfair competition or trade practices), of any Intellectual Property of any Person in any material respect; provided that the foregoing representation is limited to the Knowledge of the Seller with respect to any third party Patents to the extent they claim or are alleged to claim Wireless Standards. Except as set forth on Schedule 3.5(b) of the Seller IPA Disclosure Schedule, to the Knowledge of the Seller, no Person is infringing, misappropriating, or otherwise violating, or, within the last three (3) years, has infringed, misappropriated, or otherwise violated, any Transferred IP in any manner material to the Business. 29 Section 3.6 Employees. All Persons (including current and former employees, contractors, and consultants of any of the Seller Entities) who have conceived, created, invented, modified, improved, or developed any Intellectual Property material to, and used in or necessary for, the operation of the Business, for (or under the direction or supervision of) any Seller Entity (during the course of such employment, engagement, or Contract term therewith, as applicable) have executed and delivered to a Seller Entity, a Contract (i) providing for the non-disclosure by such Person of any trade secrets or other material confidential information of any of the Seller Entities with respect to such Intellectual Property, and (ii) providing for the assignment by way of a present grant of assignment (or, in the case of an independent contractor or consultant of (a) a Seller Entity (other than an Acquired Company), a sublicenseable license, or (b) an Acquired Company, a license) by such Person to a Seller Entity of any such Intellectual Property arising out of such Person's employment by, engagement by, or Contract with such Seller Entity, except where the failure to have such a Contract would not reasonably be expected to have a material adverse effect on the Business; provided, however, that the foregoing representation shall be to the Knowledge of the Seller solely with respect to any such contractor or consultant engaged by, or contracted with, a Seller Entity other than with the involvement or awareness of the Seller Entities' Legal and Governmental Affairs group (including any member or representative of and any attorney of any of the Seller Entities). No such Person has made any assertions with respect to any alleged ownership or title to any such Intellectual Property. To the Knowledge of the Seller, no such Person is in violation of any term or condition of any such Contract. Section 3.7 Software. None of the Seller Entities (i) has delivered, licensed, released, or disclosed to any Person any of the Source Code for any Enterprise Product (other than, in the Ordinary Course to: (1) an employee of a Seller Entity, (2) a contractor or supplier of a Seller Entity solely for the purposes of, and to the extent necessary for, such contractor or supplier to develop, manufacture, and supply Enterprise Products for any Seller Entity, and not for the direct benefit of such contractor or supplier or any other Person, or (3) with respect to Source Code that is not material to the Business, a customer of a Seller Entity with respect to Enterprise Products or to any Person for the purpose of such Person's development of Software that is compatible or interoperates with an Enterprise Product, in each case of clauses (1) through (3), under written Contracts (which include confidentiality, use, and disclosure restrictions) normally used by the applicable Seller Entity to protect its own similar confidential or proprietary information (and in no event less stringent than the terms and conditions of Article V)), except as would not reasonably be expected to have a material effect on the Business, or (ii) is a party to any Contract requiring the deposit of any such Source Code with an escrow agent or escrow service (or other escrow Contract) or requiring the sharing or disclosure of any such Source Code with any Person. With respect to any Open Source Software that is or has been used by a Seller Entity in any way in connection with any Enterprise Product (including any Open
"""

Extract the exact clause related to "Most Favored Nation" from the excerpt above.

assistant: Not found.