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:
"""
of one year on each renewal date, unless one of the parties terminates the maintenance and support contract through written notification to the other party in the form of a registered letter with proof of receipt, at least six (6) weeks prior to the renewal date. There shall be no reimbursement of any paid fee. In case of a substantial breach of this maintenance and support contract by either party, which is not remedied within thirty days from the other party's notice thereof, the other party shall have the right to terminate this maintenance and support contract with immediate effect without juridical procedures. The termination or expiration of the maintenance and support contract for any reason whatever shall be without prejudice to any other right or obligation of any party hereto in respect of this maintenance and support contract which have arisen prior to such termination. 7.6 Liability Sicap Ltd's liability for indirect loss, including consequential loss, loss of profit, lost savings and loss caused by interruption of operations is excluded. No right to damages shall ever arise unless EuroTel reports the loss to Sicap Ltd in writing as soon as possible after it has arisen. 7.7 Assignment This maintenance and support contract is for the benefit of and binding upon each of the parties hereto and their respective successors and assigns. The rights and obligations under this maintenance and support contract may not be assigned in whole or in part by either party without the prior written consent by the other party. The parties may assign the rights and obligations under this maintenance and support Contract by written notice to a subsidiary. A subsidiary of a party is considered a company of which the party is holding a majority of the equities. 7.8 Changes to the contract Except as otherwise specifically indicated herein, this maintenance and support contract will not be amended except by written agreement signed on behalf of the parties by their duly authorised representatives. At the end of each agreementual period, or at such time as mutually agreed by both parties, EuroTel has the option to select a different services, such with consequential price adjustments. [LOGO] sicap M&S contract -------------------------------------------------------------------------------- 7.9 Counterparts IN WITNESS WHEREOF, the parties hereto have executed this contract in two (2) originals by their fully authorised representatives on the day and at the place written here below, each party receiving one (1) original hereof. For and on behalf of: -------------------------------- ----------------------------------- Thomas R. Berner Thomas Cancro Key Account Manager CFO / Procurator -------------------------------- ----------------------------------- Andreas Martschitsch Jozef Barta CEO (acting) CEO / Procurator Place: Place: Date: Date:
"""

Extract the exact clause related to "Anti-Assignment" from the excerpt above.

assistant: The rights and obligations under this maintenance and support contract may not be assigned in whole or in part by either party without the prior written consent by the other party.