I format my Laptop yesterday and install Windows 10.
I didn't add a license key, but it seems like windows 10 activated automatically.
How was that possible?
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Windows 10 was already installed before you formatted (that seems certain). So then when Windows installs, it looks to the Microsoft Licensing server and activates itself. This is normal. It is the same machine and the Licensing server knows about that.
This may also allow you to replace a hard drive (SSD) on the same computer without any issues. Some changes (or more changes) may also require re-activation, and that is easy to do