I can't tell without having the faintest idea of what it is, or at least of how much creative work went into it. Do you have any tips to share in this regard?
In general, if something is very regular, I take it as non-creative and thus not copyrightable, but if it's sufficiently random that it could be code with creativity involved, it wouldn't be responsible to say it's GPLed unless whoever came up with it says so.