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:
"""
agrees that it will perform final consolidation, packaging and related activities, at Sonos' expense, for Third Party Finished Goods that require bundling with Sonos Products manufactured by IAC. Such Third Party Finished Goods will be delivered fully assembled and may be in temporary or sub-packaging. For the avoidance of doubt, the BOM for any Third Party Finished Good shall be excluded from the pricing formula in Section 7.1. 3.0 OWNERSHIP; GRANT OF RIGHTS; TRADEMARKS USAGE. 3.1. Ownership by IAC. IAC shall own, and hereby retains, all right, title, and interest in and to the IAC Property. 3.2. Ownership by Sonos. Sonos shall own, and hereby retains, all right, title, and interest in and to the Sonos Property. Except for preexisting IAC Property and any third party's Intellectual Property, IAC shall and does hereby irrevocably assign, and shall and does cause IAC Affiliates and IAC Subcontractors to irrevocably assign, to Sonos all of IAC's, IAC Affiliates' or IAC Subcontractors' worldwide right title and interest in and to the Sonos Property , if any, whether developed solely by Sonos or jointly between Sonos or a Sonos Affiliate and IAC, an IAC Affiliate, or an IAC Subcontractor, that Page 8 of 38 may arise through the performance of its obligations under this Agreement. IAC shall cooperate fully with Sonos and execute such further instruments, documents and agreements and give such further written assurances, as may be reasonably requested by Sonos, at Sonos' expense, to perfect the foregoing assignment and obtain and enforce assigned Intellectual Property Rights. 3.3. Licenses by Sonos to IAC. 3.3.1. License to Manufacture. Subject to all terms and conditions of this Agreement, Sonos hereby grants to IAC and its Affiliates a non-exclusive, worldwide, nontransferable, royalty free right and license under Sonos' Intellectual Property Rights, to manufacture the Products solely for Sonos. 3.3.2. Software License. Subject to all terms and conditions of this Agreement, Sonos hereby grants to IAC and its Affiliates a non- exclusive, worldwide, nontransferable, royalty-free right and license to make copies of the software specified in the applicable Statement of Work solely as necessary to install and embed such software in the Product. IAC shall: (i) ensure that all copies are exact copies and conform in all respects to the original master copy provided by Sonos; (ii) make only one (1) copy of such software per each Product manufactured; (iii) reproduce any proprietary notices contained in such software and not remove, alter or obfuscate any such proprietary notices; (iv) not modify or create derivative works of such software; and (v) not reverse engineer, decompile or otherwise attempt to derive the source code of such software. 3.3.3. Necessary Export Permissions. The above license grants shall be deemed to include all necessary rights and licenses, if any, to permit IAC to export the Products to Sonos or Sonos' designee. 3.4. Third Party Property. Each party shall be responsible for the payment of any royalties or other fees for any Third Party Property associated with a Third Party Component procured by such party (as set forth in the applicable Statement of Work), including any required rights to use, manufacture, copy, sell, offer for sell, distribution and export or import the Product. 3.5. Trademarks License. Sonos hereby authorizes IAC to use and to cause its Affiliates to use, the Marks as specified by Sonos on the Products and relevant documents solely for the purpose of this Agreement. Except for the limited rights granted in this Section 3.5, nothing in this Agreement grants, or should be construed to grant, any right, title, or interest in or to the Sonos Marks to IAC. At no time shall IAC challenge or assist others to challenge the Sonos Marks, or registrations thereof, or attempt to register any trademarks, service marks, trade names or other marks confusingly similar to the Sonos Marks. All goodwill associated with the Sonos Marks shall inure solely to the benefit of Sonos. 4.0 MANUFACTURING OPERATIONS; COMPLIANCE. 4.1. Program Managers. Sonos and IAC will each appoint at least one Program Manager ("Program Manager"). The names, addresses, email IDs, and telephone numbers of the Program Managers are attached to this Agreement as Exhibit B. The Program Managers shall act as liaisons and principal points of contact between the parties with respect to their respective performances of this Agreement. All communications between the Parties with respect to development of Products shall be directed to the Program Managers. The Program Managers may provide the Parties from time to time with the names and telephone numbers of
"""

Extract the exact clause related to "Covenant Not To Sue" from the excerpt above.

assistant: At no time shall IAC challenge or assist others to challenge the Sonos Marks, or registrations thereof, or attempt to register any trademarks, service marks, trade names or other marks confusingly similar to the Sonos Marks.