safe conduct

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That all men that mediate Peace, be allowed safe Conduct.
凡斡旋和平的人都应当给于安全通行的保证。
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The team will effectively communicate and exchange critical information for the safe conduct of the operation.
手术小组之间应有效沟通和交流与安全手术相关的所有重要信息。
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"The Queen of Narnia and Empress of the Lone Islands desires a safe conduct to come and speak with you, " said the dwarf, "on a matter which is as much to your advantage as to hers.
“纳尼亚女王兼孤独群岛女皇陛下要求给予安全保证，前来跟你会谈，”小矮人说，“商谈双方互利的事项。”

It is telling that the tens of thousands of civilians still huddling in cellars in Grozny seem to prefer cold, hunger and even death there to trusting the Russians' latest promise of safe conduct to a refugee camp.
ECONOMIST: Russia’s merciless war
The United States is already perilously close to losing its technical ability to conduct safe underground nuclear tests.
CENTERFORSECURITYPOLICY: Center for Security Policy Testing, Testing: Is The Clinton Administration Determined To Gut The US Nuclear Deterrent?

official protection from harm while travelling through an area, or a document that gives this

If you are given safe conduct, the authorities officially allow you to travel somewhere, guaranteeing that you will not be arrested or harmed while doing so.