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See www.quora.com/How-is-it-possible-that-museums-have-a-copyright-on-artworks-older-than-120-years
They just can limit taking pictures on their territory.
E.g. MNAC in Barcelona allows you to take pictures of anything that is not copyrighted; Picasso is copyrighted, so they don't allow you to take pictures of Picasso.
They just can limit taking pictures on their territory.
E.g. MNAC in Barcelona allows you to take pictures of anything that is not copyrighted; Picasso is copyrighted, so they don't allow you to take pictures of Picasso.