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