safe conduct

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That all men that mediate Peace, be allowed safe Conduct.
凡斡鏇和平的人都應儅給於安全通行的保証。
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The team will effectively communicate and exchange critical information for the safe conduct of the operation.
手術小組之間應有傚溝通和交流與安全手術相關的所有重要信息。
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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.
“納尼亞女王兼孤獨群島女皇陛下要求給予安全保証，前來跟你會談，”小矮人說，“商談雙方互利的事項。”

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.