At midnight on New Year’s Eve, all works first published in the United States in 1923 will enter the public domain. It has been 21 years since the last mass expiration of copyright in the U.S. That deluge of works includes not just “Stopping by Woods on a Snowy Evening,” which appeared first in the New Republic in 1923, but hundreds of thousands of books, musical compositions, paintings, poems, photographs and films.
Source: For the First Time in More Than 20 Years, Copyrighted Works Will Enter the Public Domain