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:
"""
INTELLECTUAL PROPERTY AGREEMENT This Intellectual Property Agreement (this "Agreement") is entered into in ShenZhen on February 08, 2007 between the following two parties: Party A: JingWei HengTong Technology (ShenZhen) Co., Ltd. (经纬恒通科技（深圳）有限公司 ) Registration Address: Room 1605 B,Tianan Hi-tech Plaza Tower A,Tian An Cyber Park,Futian District,Shenzhen,China Party B: ShenZhen JingWei Communication Co., Ltd.(深圳经纬通信技术有限公司) Registration Address: Tianxiang Building Block A 13th, Tian An Cyber Park, Futian District, Shenzhen. WHEREAS: 1. Party A, a wholly foreign-owned enterprise incorporated under the laws of the People's Republic of China (the "PRC"), which has the right of the intellectual property (including but not limited to Trademark, the Ownership of Consumer Data Base, Software Copyright and License) specified in the Appendix I of this Agreement (the "intellectual property"). 2. Party B is a limited liability company duly incorporated and validly existing under the PRC law, which is licensed by relevant government authorities to engage in the internet information service value-added telecommunication service; 3. Party A agrees to license the non- exclusive right to use the intellectual property pursuant to this Agreement to Party B in accordance with the terms and conditions set forth herein and Party B agrees to accept the right to use the intellectual property on the same terms and conditions set forth herein. NOW THEREFORE, both Parties agree as follows: 1. Grant of License 1.1 The Intellectual Property 1.1.1 Upon the terms and conditions hereinafter set forth, Party A hereby agrees to grant and Party B hereby agree to accept the right to use the intellectual property in PRC. The license under this Agreement is a non-exclusive, non-assignable and non-transferable license. 1.1.2 Party A owns the sole and exclusive right of the intellectual property, including any improvement, upgrades and derived products, no matter whether such products are created by Party A or Party B. The right and obligation under 1.1.2 of this article shall survive upon termination of this Agreement. 1.2 Scope Intellectual Property Agreement 1 1.2.1 The Intellectual Property granted to Party B shall only be used to the scope of Party B's Business operated by Party B. Party B shall not sub-license the Intellectual Property to others or use the Intellectual Property in the third party's training, business share, lease without the consent from Party A, unless there are opposite stipulations in this Agreement. 1.2.2 The use right granted under this Agreement is only valid in the PRC. Party B agrees not to directly or indirectly use or authorize to use the Intellectual Property in the other regions. 2. Terms of Payment: Party B agrees to pay Party A the Intellectual Property License fees (the "License Fees") and the specified amount of the license fees and the form of payment are set forth in Appendix 2. Party A has the right to exempt the obligation of payment or adjust the amount of the License Fees set forth in Appendix 2 according to the actual circumstances from time to time. 3. Party A's Rights and Protection of the Party A's Rights 3.1 Party B agrees, during the term of this Agreement, or thereafter, not to query the copyright or any rights of Party A in connection with the Intellectual Property, and conduct any actions that is deemed by Party A as harmful to its rights or license. 3.2 Party B agrees to provide necessary assistances to help Party A to protect the rights of Intellectual Property. Party A may participate the lawsuits related to the claims of compensation with its own desire, on behalf of itself, Party B or both Parties, once any third party claims the compensation in connection with the Intellectual Property of Party A. If any third party infringes any right of Intellectual Property, Party B shall notify Party A immediately in written of such infringements within the scope that it knows, and only Party A has the right to take actions against such infringements. 3.3 Party B agrees to use the Intellectual Property only pursuant to this Agreement and not to use the Intellectual Property by manner of deceit, misleading or others manners that are deemed by Party A as harmful to the Intellectual Property or the reputation of Party A. 4. Confidentiality 4.1 Party B shall protect and maintain the confidentiality of any and all confidential data and information acknowledged or received by Party B from Party A (collectively the "Confidential Information"). Upon termination of this Agreement, Party B shall return Confidential Information to Party A or destroy it itself and delete Confidential Information from any electronic
"""

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

assistant: February 08, 2007