This photograph (or rather the image) has taken on a life of its own. However much copyrighted, you can put a green hat on his head and have him dance with green martians, and it still is recognisable as Che. I have seen it so many times, in so many slight variations, it is actually hard to look at it and just see it for what it is. I am not even sure it's a good portrait, with the somewhat vacant look and the tight cropping. The knowledge of the history around and the person himself makes the photograph hard to judge by its own merits only.