Warning banners or policy directives are good examples of Preventive Control.
Brief messages called warning banners are displayed to users to alert them to rules and regulations governing how to utilize a system and the data it contains.
They typically appear when programs and operating systems are launched, or when a user accesses the home page of an intranet or a public Web site.
The warning banner serves as a legal notification to system users because it instructs them on important aspects of correct usage and may even make references to laws and policies already in effect.
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