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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"(TM)" or "(SM)" or the registration symbol "(R)" to be placed adjacent to the Network Affiliate Marks in connection with the use thereof and to indicate such additional or alternative information as Network Affiliate shall specify from time to time concerning the use by NCM of the Network Affiliate Marks. 17 Source: DIGITAL CINEMA DESTINATIONS CORP., S-1, 12/20/2011 (e) NCM shall not use any Network Affiliate Mark in any manner that may reflect adversely on the image or quality symbolized by the Network Affiliate Mark, or that may be detrimental to the image or reputation of Network Affiliate. Notwithstanding anything herein to the contrary, Network Affiliate shall have the right, at its sole option, to terminate or suspend the trademark license grant provided herein if it determines that NCM's use of the Network Affiliate Marks or any of them is in violation of its trademark usage guidelines or is otherwise disparaging to its image or reputation, and such use is not conformed to such guidelines and other reasonable requests of Network Affiliate within ten (10) days of receipt of written notice thereof. NCM's obligation to provide any Services dependant upon the use of the Network Affiliate Mark will be suspended during the period of any such suspension or termination, and NCM will have no liability for any failure to perform such Services during such time period. (f) NCM agrees not to use (i) any trademark or service mark which is confusingly similar to, or a colorable imitation of, any Network Affiliate Mark or any part thereof, (ii) any trademark or service mark in combination with any Network Affiliate Mark, or (iii) any Network Affiliate Mark in connection with or for the benefit of any product or service of any other person or entity. NCM shall not engage in any conduct which may place Network Affiliate or any Network Affiliate Mark in a negative light or context, and shall not represent that it owns or has any interest in any Network Affiliate Mark other than as expressly granted herein, nor shall it contest or assist others in contesting the title or any rights of Network Affiliate (or any other owner) in and to any Network Affiliate Mark. ARTICLE VI MANDATORY PARTICIPATION AND EXCLUSIVITY Section 6.1 Mandatory Participation and Exclusivity. During the Term, except as expressly provided in this Agreement, including Section 3.6 (Policy Trailer; Branded Slots); those provisions of Part A of Exhibit A that permit Network Affiliate to engage in certain Lobby Promotions; Section 3.11 (Grand Openings, Employee Uniforms), collectively, the "Exclusivity Exceptions", Network Affiliate shall subscribe for and NCM shall be the exclusive provider to the theatres of the services specifically set forth in the definition of the "Service." Except as permitted by the Exclusivity Exceptions, during the Term, Network Affiliate shall neither engage nor permit a third party (excluding third party designees of NCM as provided hereunder) to provide, or itself provide, to any of Network Affiliate's theatres any of the services specifically set forth in the definition of Service. Subject only to the Exclusivity Exceptions, NCM shall be Network Affiliate's exclusive representative with respect to the procurement of Inventory (including without limitation all on-screen advertising) for the Advertising Services. NCM shall be responsible, at its own expense, for the coordination and administration of Inventory placement, whether nationally, regionally or locally, including without limitation the acceptance of insertion orders, invoicing advertisers and other content providers, and the acceptance and collection of payments therefrom. Any Inventory which has not been sold as of the date for its scheduled exhibition shall be allocated to make goods, remnant advertising, and other revenue- generating advertising. Nothing in this Agreement shall limit or affect (i) NCM's ability to contract or enter into any relationship with any Person or entity for any product, service, or otherwise, whether or not similar to any products or services provided by NCM under this Agreement, or (ii) Network Affiliate's ability to contract or enter into any relationship with any Person or entity for any product, service, or otherwise, other than the services that will be provided exclusively by NCM as set forth in this Section 6.1 and meetings promoted and scheduled by Network Affiliate theatre personnel as previously referenced in this Section 6.1. All rights with respect to advertising and promotions not explicitly granted hereunder are reserved to Network Affiliate, including without limitation Network Affiliate's ability to offer and sell advertising to any third party on any website on the Internet, its telephone ticketing service or other alternative
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Extract the exact clause related to "Covenant Not To Sue" from the excerpt above.

assistant: NCM shall not engage in any conduct which may place Network Affiliate or any Network Affiliate Mark in a negative light or context, and shall not represent that it owns or has any interest in any Network Affiliate Mark other than as expressly granted herein, nor shall it contest or assist others in contesting the title or any rights of Network Affiliate (or any other owner) in and to any Network Affiliate Mark.