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:
"""
EXHIBIT 10.14 ENDORSEMENT AGREEMENT THIS ENDORSEMENT AGREEMENT (this "Agreement"), made and entered into as of May 31, 1999, by and between FAMOUS FIXINS, INC., 250 West 57th Street, Suite 2501, New York, New York 10107 ("Company") and PEY DIRT, INC. ("Pey Dirt"). WITNESSETH WHEREAS, Company desires to obtain the right to use the name, likeness and endorsement of Peyton Manning (hereinafter called "Manning") in connection with the advertisement, promotion and sale of Company's "Products" (hereinafter defined); and WHEREAS, Manning has granted such rights to Pey Dirt together with the right to sublicense such rights. NOW, THEREFORE, for and in consideration of the premises and of the mutual promises and conditions herein contained, the parties do hereby agree as follows: 1. Definitions. As used herein, the following terms shall be defined as set forth below: (a) "Contract Period" shall mean that period of time commencing as of May 31, 1999 and concluding May 31, 2000. (b) "Contract Territory" shall mean the states of Indianapolis and Tennessee and Company's e-commerce site. (c) "Contract Year Quarter" shall mean each 3 consecutive month period occurring during any Contract Year ("Contract Year" meaning any twelve month period herein commencing as of June 1) (so that, by way of example, the first Contract Year Quarter of the first Contract Year commences as of June 1, 1999, the second commences on September 1, 1999, etc.). (d) "Endorsed Products" shall mean all Products of Company which have the Manning Identification (defined below) highlighted as a part thereof (in the Products' name or otherwise) or which are shipped in containers or packages bearing the Manning Identification. (e) "Manning Identification" shall mean any words or symbols or photographic or graphic representations or combinations thereof which identify Manning such as, for example, the name and likeness of Manning. (f) "Premium Program" shall mean any traffic builder, third party tie-in program or other program involving the use of a premium and shall include any program primarily designed to attract the consumer to purchase a product or service other than Endorsed Products themselves. (g) "Products" shall mean cold breakfast cereals. 2. Grant of Endorsement Rights. (a) Pey Dirt grants to Company the exclusive right and license to use Manning Identification within the Contract Territory during the Contract Period in connection with the advertisement and promotion by Company of Products in television, radio, print and point of purchase. Pey Dirt also grants to Company, subject to all of the terms and conditions herein, the non-exclusive right to use the Manning Identification in connection with certain merchandise that may be featured on the back panel of the Endorsed Products packaging, said merchandise to be subject to Pey Dirt's sole and exclusive discretion and approval. Notwithstanding anything herein to the contrary, it is specifically agreed that the Manning Identification cannot be used, in whole or in part, in connection with (i) Premium Programs and/or (ii) any multi-media use except for Company's e- commerce site. Pey Dirt expressly agrees that the right to use Manning Identification will not be granted to anyone other than Company for use within the Contract Territory during the Contract Period in connection with the advertisement, promotion and sale of Products. Anything herein to the contrary notwithstanding, Company shall not have the right to distribute photographs of Manning which are larger than 5" x 7". (b) Company agrees that during the Contract Period it will use its best efforts actively and aggressively to (i) promote the sale of all Endorsed Products in the Contract Territory, and (ii) prevent the sale of any Endorsed Products outside the Contract Territory. Failure of Company to comply with the provisions of this Section 2(b) shall entitle Pey Dirt to revoke this license immediately (notwithstanding any other provision in this Agreement to the contrary). (c) Pey Dirt has the right to terminate this Agreement immediately if Company's Endorsed Products are not being distributed in the Contract Territory to a significant number of stores by October 1, 1999. 3. Approvals. Company agrees that no use whatsoever of Manning Identification nor any item used in connection with Manning Identification (including, without limitation, advertising) will be made hereunder unless and until the same has been approved by Pey Dirt. Pey Dirt agrees that any material, advertising or otherwise, submitted for approval as provided herein may be deemed by Company to have been approved hereunder if the same is not disapproved in writing within fourteen (14) days after receipt thereof. Pey Dirt agrees that any material submitted hereunder will not be unreasonably
"""

Extract the exact clause related to "Expiration Date" from the excerpt above.

assistant: "Contract Period" shall mean that period of time commencing as of May 31, 1999 and concluding May 31, 2000.