If that can be done, doesn't it defeat the purpose here? Anything can create a file, and then change this tag to 'system' or whatever.
Mac OS 8 dates to the 90s. Nowadays these things are probably public key signed, but back then they probably were not.
Back then, public key signing of any strength was considered a munition.
I only ever sold one license, but I was 12, so I was pretty excited.