Worth a read:
Copyright at the Museum: Using the Publication Doctrine to Free Art and
History.
Deborah R. Gerhardt University of North Carolina (UNC) at Chapel Hill - School
of Law; University of North Carolina (UNC) at Chapel Hill, September 5, 2014
Of possible interest:
NewsNet 587
July 24, 2015
Copyright Office Extends Period for Reply Comments in Notice of Inquiry
Regarding Copyright Protection for Certain Visual Works
The Copyright Office has published a Federal Register notice extending the
deadline