Windows 10: Windows without a license key

If i download windows 10 from Microsoft site and use it without license key is it legal?What about windows 7 or 8?Is it legal?I know about the watermark sign and you can't change desktop background but i really wanna know if it's legal!I use it for me,not for a company or something else.

:)

 

Need help finding OS license key

you can do a couple things.. Hope this helps..

• call your OEM and give them your serial number and they will give you the key.
• Install the new Windows 8 Developer Preview

 

Windows License Key

Windows 10 Digital License

When you upgraded from a previous version of Windows or receive a new computer preinstalled with Windows 10, what happened is the hardware (your PC) will get a digital entitlement, where a unique signature of the computer will be stored on Microsoft
Activation Servers. The Windows 7 or Windows 8 genuine license you were previously running will be exchanged for a diagnostics key.

Anytime you need to reinstall Windows 10 on that machine, just proceed to reinstall Windows 10. It will automatically reactivate. You will prompted to enter a product key a couple times through the installation, click I don't have
a key and Do this later.

There is no need to know or get a new key, but if you have issues with Digital Licensing or the Activation Troubleshooter, you can utilize an existing Windows 7 or Windows 8/8.1 product key you already own to
reactivate if necessary. or use the reset function in Windows 10.

Activate Your Windows 10 License via Microsoft Chat Support

Reinstall by Performing a Direct Clean Install

If Windows 10 was already installed and activated on your system, just proceed to perform a direct clean install as described in the following articles.

Step 1: How
to download official Windows 10 ISO files

Step 2:

• How to: Perform a clean install of Windows 10

 

Question On OEM Windows clean install......

"Flavors" of Windows licenses

Windows can be a little "odd" about license keys. There are at least 4 categories:

• Retail
• OEM
• Volume (electronic download)
• Corporate (no key needed)

For guaranteed success, the license key and media should be in the same category. If you have retail media, you may not be able to install it using an OEM or Volume license key, even though the key is valid for that version of Windows. *Wtf :wtf: Apparently, this is part of Microsoft's anti-piracy scheme (i.e., all customers are guilty until proven innocent).