this is a subject that i have wondered about for a while. especially after today's visit to the prado, i thought i would ask for your insights.
in a nutshell, i am curious why some museums do not allow any photography whatsoever. the prado seemed to be particularly strict with the gallery guards literally 'patrolling' and stopping people from taking photos. other equally important museums, like the brera, uffizi, rijksmuseum, etc don't have any restrictions except for the understandable no flash, no tripod, and no selfie stick.
is it a copywrite issue? if so how can a work of art created hundreds of years ago be copywrited? i can understand more recent works where the artist and/or their estate are still around. is it simply something an institution (state or private) makes up because they are vested in making money by selling reproduction?
i would like to be enlightened by someone more informed about museum administration.