Within the validity period of Contract， Both parties shall take proper measures to keep Know-how and Technical Documentation strictly confidential. Licensee shall not disclose or divulge Know-how to any third party without prior written consent of Licensor.
fundamental——书面用词，不如basic使用广泛，侧重指作为基础、根本的抽象的事物。essential——语气比fundamental强，强调必不可少，暗含某物如缺少某部分，则失去本质特征的意味。
