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Key usage

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Applies To: Windows Server 2003, Windows Server 2003 R2, Windows Server 2003 with SP1, Windows Server 2003 with SP2

Key usage

A certificate enables the subject to perform a specific task. To help control the usage of a certificate outside its intended purpose, restrictions are automatically placed on certificates. Key usage is a restriction method and determines what a certificate can be used for. This allows the administrator to issue certificates that can only be used for specific tasks or certificates that be used for a broad range of functions.