How do you prevent unauthorized users from using the KMS keys? How are users authenticated to begin with to use a KMS keys?

Hi Chirthl, Before we go further, please understand that KMS activations are valid for 180 days—the activation validity interval. To remain activated, KMS client computers must renew their activation by connecting to the KMS host at least once every 180 days. In other words, KMS gives client computers a trial period instead of preventing it from using KMS. After that, client computers must connect to KMS host to renew it before the trial period ends. That’s how KMS keeps secure. For more information, please refer to this article: Understanding KMS http://technet.microsoft.com/en-us/library/ff793434.aspx If you need further assistance, it is recommended you create a new thread in the Setup Deployment forum. The support professional there are more familiar with KMS and can help you in a more efficient way. Setup Deployment http://social.technet.microsoft.com/Forums/en-US/winserversetup/threads Hope this helps. Regards, Bruce

Does this mean that the KMS key in the VLSC changes every 180 days?

Hi Chirthl, The key will not change. But Operating System on the client computer will became unactivated. If you have more questions about KMS, please create a new post in Setup Deployment forum. The support professional there are more familiar with KMS and can help you in a more efficient way. Setup Deployment http://social.technet.microsoft.com/Forums/en-US/winserversetup/threads Thanks for your understanding. Have a nice day! Regards, Bruce

Thanks Bruce!