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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("Marketing Materials") that have been approved by NCM pursuant to the terms hereof. Network Affiliate acknowledges that NCM is and shall remain the sole owner of the NCM Marks, including the goodwill of the business symbolized thereby. Network Affiliate recognizes the value of the goodwill associated with the NCM Marks and acknowledges and agrees that any goodwill arising out of the use of the NCM Marks or any of them by Network Affiliate shall inure to the sole benefit of NCM for all purposes hereof. 15 Source: DIGITAL CINEMA DESTINATIONS CORP., S-1, 12/20/2011 (b) Prior to using any Marketing Materials or depicting or presenting any NCM Mark in or on any Marketing Materials or otherwise, Network Affiliate shall submit a sample of such Marketing Materials or other material to NCM for approval. NCM shall exercise commercially reasonable efforts to approve or reject any such Marketing Materials or other material submitted to it for review within thirty (30) days from the date of receipt by NCM. Network Affiliate shall not use, publish, or distribute any Marketing Materials or other material unless and until NCM has approved it in writing. Upon receipt of such approval from NCM for a particular Marketing Materials or other material, Network Affiliate shall not be obligated to submit to NCM substantially similar material for approval; provided, however, Network Affiliate shall timely furnish samples of all such material to NCM. For the avoidance of doubt, nothing in this Subsection 5.3(b) shall limit or affect Network Affiliate's obligations set forth in any other subsection of this Section 5.3 or any other provision of this Agreement. (c) Any and all use or exercise of rights by Network Affiliate with respect to the NCM Marks shall be subject to and in accordance with the NCM Quality Standards, and, without limiting such standards, subject to and in accordance with standards of quality and specifications that conform to or exceed the highest quality standards and specifications achieved by NCM and its licensees in their use and exercise of rights with respect to the NCM Marks. NCM shall have the right to change the NCM Quality Standards from time to time upon notice to Network Affiliate. (d) Network Affiliate shall cause the appropriate designation "(TM)" or "(SM)" or the registration symbol "(R)" to be placed adjacent to the NCM Marks in connection with the use thereof and to indicate such additional or alternative information as NCM shall specify from time to time concerning the use by Network Affiliate of the NCM Marks. (e) Network Affiliate shall not use any NCM Mark in any manner that may reflect adversely on the image or quality symbolized by the NCM Mark, or that may be detrimental to or tarnish the image or reputation of NCM. Notwithstanding anything herein to the contrary, NCM shall have the right, at its sole option, to terminate or suspend the trademark license grant provided herein if NCM, in its sole discretion, determines that Network Affiliate's use of the NCM Marks or any of them is in violation of the terms of this Agreement or of the NCM Quality Standards, or is otherwise disparaging to NCM's image or reputation, and such use is not conformed to the terms of this Agreement of the NCM Quality Standards within ten (10) days of receipt of written notice thereof. NCM's obligation to provide any Services dependant upon the use of the NCM Marks 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) Network Affiliate agrees not to use or adopt (i) any trademark or service mark which is confusingly similar to, or a colorable imitation of, any NCM Mark or any part thereof, (ii) any trademark or service mark in combination with any NCM Mark, or (iii) any NCM Mark in connection with or for the benefit of any product or service of any other person or entity. Network Affiliate shall not engage in any conduct which may place NCM or any NCM Mark in a negative light or context, and shall not represent that it owns or has any interest in any NCM Mark other than as expressly granted herein, nor shall it contest or assist others in contesting the title or any rights of NCM (or any other owner) in and to any NCM Mark. 16 Source: DIGITAL CINEMA DESTINATIONS CORP., S-1, 12/20/2011 Section 5.4 License of the Network Affiliate Marks. (a) Subject
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Extract the exact clause related to "Non-Disparagement" from the excerpt above.

assistant: Network Affiliate shall not engage in any conduct which may place NCM or any NCM Mark in a negative light or context,