法定的免责事由是指法律直接规定，不需要当事人约定即可援用的免责事由，主要指不可抗力。
不可抗力作为法定免责事由是过错原则的体现。侵权责任与合同责任均适用不可抗力。
Force Majeure is a legal reason for exemption embodied in the principle of fault liability, which is applied in determining the liability for tort and contract liability.
重大自然灾害在合同法上被界定为不可抗力，作为法定的免责事由而免除当事人合同不履行的法律责任。
The grave natural disaster is regarded as the irresistible force written in the contract law, and so it can be an exemption when the contract cannot be observed.
专利侵权抗辩的法定免责事项包括专利权用尽、先用权、临时过境使用、专为科学研究和实验而使用以及善意使用等事由。
Patent infringement demur of the statutory exemption include exhaustion of patent rights, prior user rights, temporarily passing through, specifically experimental use, liable applications, etc.
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