
Quoting
jk
From my understanding, any works that were not published or
registered during the period where copyrights were not automatically conferred were granted copyrights and treated the same as works created after Jan 1 1978 under the copyright act of 1976. That would mean as long as they were not published, copyrights protections were conferred on them just as with any worlds created after Jan 1 1978.
Its an oddity that works that were never registered (as long as they were not published) had longer lived protections than that available for some works created when registration was required to obtain copyrights.
I tend to suggest people err on the side of caution when there is a possibility of copyright issues. Especially given the nature of the pictures involved, should a relative of one of the subjects of any of the pictures become aware of the pictures, I wouldn't be surprised to hear they took any means available to quash the use of the picture of their relative.
I am curious as to the age of the photos. The more I see about issues in the early years of our country, the more I realize there were a bunch of kinky people back then.