I hope that my question is not that stupid.
I'm trying to implement a very very basic way to control where (on which computer) a perl script (.exe) can be run. For this reason I'd like to read a stable unique value from the computer (it doesn't matter what, it just should not change overt time). Maybe some hardware information? A SN? I would check against this value to see if the software can run on this machine.
Now, what kind of unique/stable value can be easily picked up using a pure perl script? Any idea would be much appreciated so that I can better direct my searchings!