For the first time in twenty years, as the Atlantic points out, a whole year's worth of copyrighted works will enter the public domain in the U.S. on January 1, 2019. Under the terms of the Sonny Bono Copyright Act, works first published in 1923 will enter the public domain, meaning anyone can re-publish them, or chop them up and use them in other projects, without asking permission or paying the old rights holders. You can record new versions of the musical compositions; you can show the movies for a profit; you can even remake them. Amazon can sell you the ebook and keep all the money, and Project Gutenberg can give you the ebook for free. The Atlantic has a short list; we have a longer one below.

If you're looking for something interesting to watch, YouTube channel Public Domain Full Movies is full of, well, what its name implies. Classic films like A Trip to the Moon and Behind Green Lights to fun flicks like Gammera The Invincible are all here to stream, completely free, to any device.