It seems that while it's in the public domain, it's not easily accessible, it really only exists digitized on Getty's servers. It sounds like when you download

It seems that while it's in the public domain, it's not easily accessible, it really only exists digitized on Getty's servers. It sounds like when you download from Getty, their license restricts you from distributing the copy that you obtained from them (gleaned from the documentary linked in the OP, though I'm not sure how this is legal).