Activation in Windows 10
Activation helps verify that your copy of Windows is genuine and hasn’t been used on more devices than the Microsoft Software License Terms allow. Depending on how you got your copy of Windows 10, activation will use either a digital entitlement or a 25-character product key.
Digital entitlement is a new method of activation in Windows 10 that doesn't require you to enter a product key.
How you got Windows 10
You upgraded to Windows 10 for free from an eligible device running a genuine copy of Windows 7 or Windows 8.1.
You bought genuine Windows 10 from the Windows Store and successfully activated Windows 10.
You bought a Windows 10 Pro upgrade from the Windows Store and successfully activated Windows 10.
You’re a Windows Insider and upgraded to the newestWindows 10 Insider Preview build on an eligible device that was running an activated previous version of Windows andWindows 10 Preview.
You upgraded to Windows 10 (Version 1511 or higher) and activated it using a Windows 7, Windows 8, or Windows 8.1product key.
(A digital entitlement will be given to your device forWindows 10 based on the valid product key you entered)
You bought a copy of Windows 10 from an authorized retailer.
(On a label inside the Windows 10 box)
You bought a digital copy of Windows 10 from an authorized retailer.
(In the confirmation email you received after buyingWindows 10 or in a digital locker accessible through the retailer’s website)
You have a Volume Licensing agreement for Windows 10 or MSDN subscription
(Available through the web portal for your program)
You bought a new device running Windows 10.
(Pre–installed on your device, included with the device packaging, or included as a card or on the Certificate of Authenticity (COA) attached to the device)
KMspico is a helpful tool for Activation of Windows 10