Getting product key for Windows confusion. Produkey and Jellyfinder read different product key for Windows than Everest. | Tom's Guide Forum

I run Everest by Lavalys and give me this product key for Windows 8.1 under Operating System > Licence information > Product key:Product Key****Another similar software: HWinfo, gave me this same one.I was surprised to see both Produkey and Magic Jellybean give me a different one:CD Key: *****Jellybean lists it as CD Key Produkey calls it Product KeyWhat\’s the real one <EDIT: sensitive data removed by Moderator> 

Was this a preinstalled OS, or something you bought and installed?