I have seen so many versions of this same script. The fact is that such header comments at the top of every file aren't that useful. I mean, what do you use them for? The information in them, is already stored from the fact that the file is under source code control. If someone moves the file from that then that will just increase the chance that the header comment is wrong.

Put another way, have you ever been reading a file and thought "Oh I wonder which project this belongs to and who wrote it? I'll check the top."