(FROM APPLE DEVELOPER SITE)
macOS High Sierra 10.13 introduces a new feature that requires user approval before loading newly-installed third-party kernel extensions (KEXTs). When a request is made to load a KEXT that the user has not yet approved, the load request is denied. Apps or installers that treat a KEXT load failure as a hard error will need to be changed to handle this new case.Approval is automatically granted to third-party KEXTs that were already present when upgrading to macOS High Sierra.
Note that approval doesn’t guarantee that a KEXT is compatible and won’t panic the system. The reason this feature exists is to give users more control over what KEXTs will load, which should reduce the number of panics.
