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:
"""
York 14623 USA Attn: Chief Executive Officer With e-mail PDF copy to: Document Security Systems, Inc. 200 Canal View Blvd., Suite 300 Rochester, New York 14614 USA Attn: General Counsel (jdangelo@dsssecure.com) If to Developer: HotApp International Ltd. 17B, Greatmany Centre 109-111 Queen's Road East Hong Kong Attn: Chief Executive Officer With a copy to: 9.9. Force Majeure. Notwithstanding any provision herein, the parties may be discharged from all liabilities if the failure to perform or improper performance of this Agreement is the result of Force Majeure, provided that the party subject to the Force Majeure provides notice of such Force Majeure, as soon as possible after such party became subject to such Force Majeure. 9.10. Governing Law; Jurisdiction. This Agreement shall be governed in accordance with the laws of the State of New York without regard to conflict of laws principles. It is hereby irrevocably agreed that legal jurisdiction and venue for any proceeding arising out of this Agreement shall be in the state or federal courts located in the County of Monroe, State of New York, United States. 9.11. Entire Agreement. This Agreement and the Schedules and Exhibits hereto contain the entire agreement between the parties with respect to the transactions described herein, and supersede all prior agreements, written or oral, with respect thereto, provided, however, that notwithstanding any provision herein, the NDA shall remain in full force and effect. 9.12. Counterparts; Facsimile Signatures. This Agreement may be executed in counterparts, each of which shall be deemed to be original but all of which together shall constitute a single instrument. The signatures required for execution may be transmitted electronically to the other party via e-mail PDF, and such signatures shall be deemed original signatures. [Remainder of Page Intentionally Left Blank - Signature Page Follows] 4 Source: HF ENTERPRISES INC., S-1, 12/23/2019 IN WITNESS WHEREOF, the parties hereto have caused this Agreement to be executed by their respective duly authorized officers as of the date first set forth above. DOCUMENT SECURITY SYSTEMS, INC. HOTAPP INTERNATIONAL LTD. /s/Jeffrey Ronaldi /s/ Nathan Lee Name: Jeffrey Ronaldi Name: Nathan Lee Title: Chief Executive Office Title: Chief Executive Officer 5 Source: HF ENTERPRISES INC., S-1, 12/23/2019 SCHEDULE 1 TECHNOLOGY DEVELOPMENT SERVICES (Attached) 6 Source: HF ENTERPRISES INC., S-1, 12/23/2019 Technology Development Services Deliverables from March 1s t to May 31s t 1. To conduct thorough testing of AuthentiGuard App for specificclients provided by DSS for every releases in Android and iOS as instructed by DSS. 2. To development Android Mobile App for core scanning modulewith improvement of scanning accuracy for major Android Phones (Samsung S7, S8 in particular) 3. To develop Sales Demo Apps for AuthentiGuard with guidelines offered by Product Marketing Team from DSS 4. To establish the standard testing procedure for all clients AuthentiGuard Mobile App testing 5. To develop Proof of Concept for AuthentiSite Note: Detail Scope of Work to be agreed during the meeting with HotApp on March 20-24th, 2018. Deliverable for subsequent 3 months will be mutually agreed by end of May. 7 Source: HF ENTERPRISES INC., S-1, 12/23/2019 EXHIBIT A MUTAL NON-DISCLOSURE AGREEMENT (Attached) 8 Source: HF ENTERPRISES INC., S-1, 12/23/2019
"""

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