A device access rule is a setting that determines which users can access devices that are installed or connected to the computer.
By default, access rules are created for all classes of devices in the classification of the Device Control component. Such rules grant users full access to the devices, if access to the connection buses of the respective types of devices is allowed.
A connection bus access rule allows or blocks access to the connection bus (USB or FireWire).
You can edit device access rules and connection bus access rules.
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