For the first time in 20 years, the public domain for copyrighted works has expanded! Works that were copyrighted in 1923 were protected on 31 December 2018 but entered the public domain on 1 January 2019 … and that has happened now for the first time in 20 years thanks to the Sonny Bono Copyright Act.
Anyone can now re-publish the 1923 works, or use them in other projects, without asking permission or paying the former rights holders. Anyone can record new versions of the musical compositions; anyone can show the movies for a profit; anyone can even remake those movies. Project Gutenberg can give you the ebook of those 1923 works for free.
Works now in the public domain include some of the poetry by Edna St. Vincent Millay and Robert Frost; a couple of Agatha Christie mysteries; Khalil Gibran’s “The Prophet”; “The Ego and the Id” by Freud; writings by by Jane Austen, D.H. Lawrence, Edith Wharton, Jorge Luis Borges, Mikhail Bulgakov, Jean Cocteau, Italo Svevo, Aldous Huxley, Winston Churchill, G.K. Chesterton, Maria Montessori, Lu Xun, Joseph Conrad, Zane Grey, H.G. Wells, and Edgar Rice Burroughs; artwork by M. C. Escher, Pablo Picasso, Wassily Kandinsky, Max Ernst, and Man Ray.
Be careful with music, though. Some music published in 1923 is NOT in the public domain, and will not be until 2064 since rights over music recorded until 1972 is governed by state law.