The activation clock gives testers and end users a 30-day grace period during which Windows® activation is not required.
Rearm the Activation Clock
By default, each time you generalize the computer you rearm the Windows activation clock. When a computer with a rearmed Windows image boots, the grace period begins and the end user has 30 days to activate that installation of Windows. For more information about generalizing the computer, see Prepare to Capture an Image for Deployment (Generalize).
- If you are a Key Management Service (KMS)
client, you can generalize the image to rearm the activation clock
an unlimited number of times. KMS requires the end user to be able
to connect to a functional KMS host on the network, with an
appropriate key installed to activate the computer. For more
information about KMS, see the Volume Activation Planning Guide.
- If you do not use KMS, you can generalize the
image to rearm the activation clock. However, you can rearm the
clock only a limited number of times, determined by the Windows
edition. After you reach this limit, you can still generalize the
image, but the activation clock is not rearmed.
Delay Rearming the Activation Clock
If you do not use KMS and need to generalize the image more than a few times, you can delay rearming the clock by skipping the Windows Software Licensing Rearm program:
- Set the Microsoft-Windows-Security-SPP\
SkipRearmunattended setting value to 1. Then, generalize the image as many times as necessary. Windows Setup does not rearm the image.
- To prepare the image for deployment, set the
SkipRearmvalue back to 0, and then generalize the computer again. This rearms the activation clock and prepares the computer for shipping to the end user. All activation-related licensing and registry data is removed or reset, and any grace-period timers are reset.
Detect How Many Times You Can Rearm the Activation Clock
To see how many times you can rearm the Windows activation clock, open a command prompt and use the slmgr /dlv command. A Windows Script Host window appears with the current state of the Windows Activation clock.