查看“Windows 产品激活”的源代码

{{Infobox Windows component
|name = Windows Product Activation
|logo = WinXPActivation-Icon.png
|screenshot = WindowsXP-5.1.2600-WPA.png
|introduced in = [[Windows XP build 2410]]
|caption = Windows Product Activation in [[Windows XP]]
|type = Digital Restrictions Management
}}
'''Windows Product Activation''' (based on Microsoft's Product Activation technology first seen in Office XP) is a DRM technology employed by [[Windows XP]] and later that requires the user to activate their copy of Windows online as a means of enforcing the relevant provisions of the license agreement about using the product on multiple computers. The consequences of not activating Windows within a so-called grace period differ with each version and edition, ranging from the user not being able to log in at all or certain features being unavailable, to the user being reminded to finish the activation process via a watermark or a periodic modal warning.

Activation is distinct from registering Windows, an optional service introduced earlier that allowed the user to sign up for notifications about new Microsoft products, updates and other promotions.

==History==
===Windows XP===
[[File:WindowsXP-5.1.2410-WPA.png|thumb|Windows Product Activation in Windows XP build 2410]]
The first build to have Windows Product Activation is [[Windows XP build 2410]], but it is non-functional until [[Windows XP build 2428|build 2428]], where it prevents login after 14 days; however, it still can be deactivated over the registry, and [[Safe mode]] bypasses it as well. It received its final appearance in [[Windows XP build 2465 (idx01)|build 2465]]. [[Windows XP build 2542]] extends the grace period to 30 days, although it was reverted back to 14 days in [[Windows Longhorn build 3683]]. [[Windows Longhorn build 4029 (main)]] also extends the grace period to 60 days.

===Longhorn===
<div class="hatnote">Main article: [[Windows Longhorn build 4093 (main)#Prototype Windows Product Activation|Windows Longhorn build 4093 (main) § Prototype Windows Product Activation]]</div>
[[File:4093 WindowsActivation2ndDialogue.png|thumb|Avalon-based Windows Product Activation in Windows Longhorn build 4093]]
It was rewritten as an [[Avalon]]-based application in [[Windows Longhorn build 4093]], but it is largely incomplete. It is included as <code>LicenseUI.exe</code> in the .NET Framework library folder (<code>C:\Windows\Microsoft.NET\Windows\v6.0.4030\</code>), and thus being completely detached from the non-functional OOBE. Previously, Windows Product Activation was absent in 408x builds of [[Longhorn]].

==Functionality==
Windows Product Activation can be invoked by launching <code>msoobe.exe</code> with the <code>/A</code> parameter. It offers activation over the internet (which requires updating root certificates beforehand) and over telephone, as well as registration at Microsoft. The user can also activate Windows in the OOBE.
[[Category:Introduced in Windows XP]]
[[Category:Windows components]]