Data-mining reveals that 80% of books published 1924-63 never had their copyrights renewed and are now in the public domain

This January, we celebrated the Grand Re-Opening of the Public Domain, as the onerous terms of the hateful Sonny Bono Copyright Act finally developed a leak, putting all works produced in 1923 into the public domain, with more to follow every year -- 1924 goes PD in 2020, and then 1925, etc. Read the rest