There isn't going to be. Windows 10 is hardware locked, meaning it uses your hardware ID and registers the purchased copy of Windows to it upon first startup (which is done by OEM).
What part of hardware???
that means that if I will change the motherboard or the graphic card will not work anzmore???
There are APP's that can show the actual product key, AIDA64 shows it, but the product is locked to your system unless you purchase a retail copy which can be moved to another system