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Asked: 2026-06-10T11:13:31+00:00

I have a software activation logic which relies on thre parameters: HKLM\SOFTWARE\Microsoft\Windows NT\CurrentVersion\DigitalProductId HKLM\SOFTWARE\Microsoft\Windows

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I have a software activation logic which relies on thre parameters:

  1. HKLM\SOFTWARE\Microsoft\Windows NT\CurrentVersion\DigitalProductId
  2. HKLM\SOFTWARE\Microsoft\Windows NT\CurrentVersion\InstallDate
  3. Id of system volume

I’m interested in question: could these parameters ever change under any conditions except manual modification of registry values (for 1, 2) in single OS installation?

System volume id, as far as i know, can change only when the volume is formated.
Both DigitalProductId and InstalLDate also should be constant in single OS as they identify a license (concrete windows installation) and the date the OS was initially installes respectively. So according to this logic they shouldn’t ever change.

I want to find any documentation that proves these points. Unfortunately my searching for such a documentation didn’t give me enough as all that i’ve found are articles like this http://technet.microsoft.com/en-us/library/cc709644(v=ws.10).aspx which contain inderect information on the topic.

Also i’ve looked through this great post: http://siginetsoftware.com/forum/showthread.php?596-Investigating-the-Microsoft-Digital-ProductID-(DPID)

It partially proves my points but doesn’t give a 100% guarantee

I repeat a question here once again:

Could parameters 1-3 ever change in single Windows installation?

Thanks in advance

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1 Answer

  1. Editorial Team

    My research has shown that independently of windows updates, service packs and other software, these keys remain the same.

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