What Could Have Entered the Public Domain in 2015?

Current US law extends copyright for 70 years after the date of the author's death, and corporate "works-for-hire" are copyrighted for 95 years after publication. But prior to the 1976 Copyright Act (which became effective in 1978), the maximum copyright term was 56 years—an initial term of 28 years, renewable for… » 1/02/15 7:30am 1/02/15 7:30am