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安装破解版的app或者非appstroe的app经常会遇到这个问题。出现这个情况，通过下面的方法并不能解决：

  1. 系统偏好设置-任何来源“——不管用
  2. 没有任何来源字样，搞定之后勾上任何来源，不管用

实际上问题是出在了mac的quarantine flag上，如果要修复这个问题需要用到下面的命令：

sudo xattr -rd com.apple.quarantine /Applications/xxx.app

com.apple.quarantine属性：

Type: com.apple.quarantine
Subtypes: none
Serialisation: none
Data type: UTF-8 string containing Gatekeeper score, the system time of download, the downloading app or agent, and a UUID for the event
Example: <30303833 3b353833 37316533 633b5361 66617269 2e617070 3b334239 32393643 302d4336 46342d34 3942332d 42414331 2d424342 32323946 46453744 36> «0083;58371e3c;Safari.app;3B9296C0-C6F4-49B3-BAC1-BCB229FFE7D6»
macOS: El Capitan, Sierra, High Sierra
System use: very uncommon
App use: all downloaded apps
Document use: common, notably Zip and other archives which have been downloaded
Other usage: none

Purpose: flags requirement to perform full Gatekeeper check on downloaded app (or executable).
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