Determine Windows Licence type

Simply open a Command Prompt and run:

slmgr -dli
License Type Description
Retail This when you buy a Full Packaged Product (FPP), commonly known as a “boxed copy”, of Windows from a retail merchant or purchases Windows online from the Microsoft Store. Product keys can be transferred to another PC.
OEM Product keys are issued by the original equipment manufacturer (OEM) and are not-for-resale and may not be transferred to another computer. They may, however, be transferred with the computer if the computer is transferred to new ownership. If the OEM PC came preinstalled with Windows 8 or Windows 10, then the product key will be embedded in the UEFI firmware chip.
Volume KMS Client and Volume MAK product keys, are volume license keys that are not-for-resale. They are issued by organizations for use on client computers associated in some way with the organization. Volume license keys may not be transferred with the computer if the computer changes ownership. This form of licensing typically applies for business, government and educational institutions, with prices for volume licensing varying depending on the type, quantity and applicable subscription-term. A volume license key (VLK) denotes the product key used when installing software licensed in bulk, which allows a single product key to be used for multiple installations. For example, the Windows Enterprise edition is activated with a volume license key.

 

Note : SLMGR is not available on Windows Server 2003, unless you installed the “key-management-service-kms-host-for-windows-server-2003”

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