Calendar-based device security

Events of a calendar are identified and evaluated for confidentiality due to an explicit tag, location, participants, or subject matter. In response, permissions of applications on a device are dynamically reduced. Permissions may include permissions to access sensors such as a microphone and camera. Sensors of other devices such as a voice-processing device or Bluetooth device may be disabled. The risk associated with applications on a device may be evaluated based on permissions, usage, collected data, cloud service provider, location, permissions and usage of other users of the application, and other attributes of the application. The risk may be represented as a risk score used to determine whether to perform a mitigation action.