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:
"""
Trademarks shall inure to the benefit of Zogenix. Distributor acknowledges Zogenix's exclusive ownership of the Zogenix Trademarks and agrees not to take any action inconsistent with such ownership. Distributor shall provide Zogenix with samples of any advertising and promotional materials in original language that incorporate the Zogenix Trademarks prior to distributing such materials for use. Distributor shall comply with reasonable policies provided by Zogenix from time to time to maintain the goodwill and value of the Zogenix Trademarks. Distributor shall not, and shall cause its Affiliates not to, (i) use, seek to register, or otherwise claim rights in any Trademark that is confusingly similar to, misleading or deceptive with respect to, or that materially dilutes, any of the Zogenix Trademarks, or (ii) knowingly do, cause to be done, or knowingly omit to do any act, the doing, causing or omitting of which endangers, undermines, impairs, destroys or similarly affects, in any material respect, the validity or strength of any of the Zogenix Trademarks (including any registration or pending registration application relating thereto) or the value of the goodwill pertaining to any of the Zogenix Trademarks. 9.8 Product Trademarks. (a) Selection and Ownership of Product Trademarks. All packaging, promotional materials, package inserts, and labeling for the Product in the Field in the Territory shall bear one or more Trademarks that pertain specifically to the Product, including the Trademarks in existence as of the Effective Date as set forth in Exhibit 9.8 (each, a "Product Trademark"). If the Product Trademarks in existence as of the Effective Date are not eligible for trademark protection or for use in connection with the Product in the Field in the Territory or if the Parties agree that alternative or additional Trademarks may be beneficial, Distributor may investigate appropriate Trademarks for the Product in the Territory. If the Parties identify and agree on alternative or additional Trademarks for the Product in the Territory, Zogenix shall use Commercially Reasonable Efforts to register such Trademark(s) for the Product in the Field in the Territory. Zogenix or its Affiliates shall own all right, title, and interest in and to all Product 36 US-DOCS\105216871.19 Source: ZOGENIX, INC., 10-Q, 5/9/2019 Trademarks, all corresponding trademark applications and registrations thereof, and all common law rights thereto. All goodwill of the business associated with or symbolized by the Product Trademarks shall inure to the benefit of Zogenix. Distributor acknowledges Zogenix's exclusive ownership of the Product Trademarks and agrees not to take any action inconsistent with such ownership. (b) Maintenance and Prosecution of Product Trademarks. Zogenix shall, at Zogenix's sole expense, control the registration, prosecution and maintenance of the Product Trademarks in the Territory; provided, that Zogenix shall keep Distributor reasonably informed of Zogenix's actions with respect thereto and shall consider in good faith any reasonable comments made by Distributor with respect thereto. (c) Use of Product Trademarks. Distributor shall promote, market, sell, offer for sale, import, distribute and otherwise commercialize the Product in the Field in the Territory only under the Product Trademarks. Distributor shall provide Zogenix with samples of any advertising and promotional materials that incorporate the Product Trademarks prior to distributing such materials for use. Distributor shall comply with reasonable policies provided by Zogenix from time to time to maintain the goodwill and value of the Product Trademarks. Distributor shall not, and shall cause its Affiliates not to, (i) use, seek to register, or otherwise claim rights in the Territory in any Trademark that is confusingly similar to, misleading or deceptive with respect to, or that materially dilutes, any of the Product Trademarks, or (ii) knowingly do, cause to be done, or knowingly omit to do any act, the doing, causing or omitting of which endangers, undermines, impairs, destroys or similarly affects, in any material respect, the validity or strength of any of the Product Trademarks (including any registration or pending registration application relating thereto) or the value of the goodwill pertaining to any of the Product Trademarks. (d) Enforcement of Product Trademarks. Zogenix shall have the first right, but not the obligation, at Zogenix's expense, to enforce and defend the Product Trademarks in the Territory, including (i) defending against any alleged, threatened or actual claim by a Third Party that the use of the Product Trademarks in the Territory infringes, dilutes or misappropriates any Trademark of that Third Party or constitutes unfair trade practices, or any other claims that may be brought by a Third Party against a Party in connection with the use of or relating to Product Trademarks in the
"""

Extract the exact clause related to "Volume Restriction" from the excerpt above.

assistant: Not found.