Some of you may have installed the Windows 8 Developer Preview Edition, to check it out. While installing it, you would not have been asked for the license key.
But when and if you need to reset or reinstall this operating system, you may be asked to enter a license key.
So which key do you use!?
This forum thread over at Microsoft, answers this question.
If you need to reinstall Windows Developer Preview or use the Reset functionality, you might be asked to enter this product key:
If you’re running a server version of Windows Developer Preview, you can use this product key:
So there you have it. You might want to make a note of it, just in case you need it!
Hat tip: Ghacks.