the artist is Pascal Jousselin http://pjousselin.free.fr/

it's called 'Imbattable' or Mister Invincible

So you're concerned about printing 1 copy for home or office, but not about sharing this image on the internet?

Please do whatever you want with an image posted to an internet forum

He passed a reference, not a copy. He doesn't need ownership to do so.

(a little Rust humor)