As for the 1920 picture, it is true that copyright does have an length to it. Now, 50+ after the death of the copyright holder does not make sense to me. The purpose of copyright to give a balance between the producer of the work with respect to his creation and the general public as a hold. Once expired, how can one make copies?
The interesting thing today in copyright is the technology issue. In the past, painters usually made a single painting and it was unique. As were many books (when you had to painstakingly rewrite it). Today, making a copy of a CD is quite easy. Did anyone make copies of vinyl (on to vinyl, not tape)? Today making a copy of a photograph is easy (be it a scanner or digital).
So, I guess the intent is the main issue. As Darrel said, if I make a bunch of copies of a CD with intent of selling (or giving them away), then that would be a stealing. If my intent was only to make a personal copy to prevent a defect in today’s technology then that is not stealing. I am intenting to preserve my copy.
So, in the case of the 1920 photograph, even with the present 50+ of copyright, as a personal copy, I don’t see that as stealing. But, if you take the 1920 photograph, make many copies and sell them (or give them away), then I that would be stealing.
I’ve said several times about giving it them away. I did that on purpose. In the recent Napster days, a person was just making a song on his hard drive available to anyone to copy. Usually, they did not make actual copies or charged for them, but it still violates the spirit of the copy right law. The creater of the work of art has the right to control the copy mechanism.
Paul