Re: ....unless they can prove its not copyrighted
Yes you can sell copies of the Mona Lisa. It was painted in 1503 or 1504. Leonardo da Vinci lived until 1519, so, life + 70 as currenty copyright in the EU is means that the copyright expired in 1574. This means, as long as you aren't selling them as originals by L. da Vinci, you've been able to sell copies for over 440 years.