How to detect if a Windows version is legal or not? [closed]

Answer 1

You can't possibly know and you shouldn't care.

The legal status of an install is entirely unrelated to anything on the disk. The same install can be unlicensed now and licensed the next minute without any changes to the machine.

Answer 2

That's something for Microsoft to worry about. Not you.

Answer 3

Just asking the technical part, leaving out your reasons/philosophy would have given you direct answers.