Ron Hunter wrote:

In some cases, the paper is DESIGNED to prevent copying, but some
improvement can be made with descreening. I also hate these papers, but
they do have a right to prevent copying.

At some level they have the right, yes.

And if the studio is dead and gone, or the old negatives discarded, and
they *can't* sell you additional prints, then you have the right to
curse their name, too.

And remember this next time you pick where to get portraits taken.