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This policy controls the usage of Android apps from untrusted sources (other than Google Play Store) on a per-user basis.
If the value for this policy is not set, then the functionality is treated as disallowed.
If the user's device is managed, the availability of this functionality is additionally dependant on the corresponding device policy.
If the user's device is not managed, the availability of this functionality is additionally dependant on whether the user is the device owner.