Here is the trap that catches 90% of amateur archivists. A film from 1925 might have a public domain visual component, but the musical score attached to a DVD release might be copyrighted. Even worse, a silent film from 1922 (clearly public domain) might have a 1990s "director's commentary" or a modern electronic soundtrack.

This is the beating heart of the movement. The Internet Archive hosts over 1.6 million moving images. Because they have digitized thousands of 16mm and 35mm prints from the Library of Congress and private collectors, you can find:

The search for "Film Project Gutenberg" reveals a desire for something the streaming giants (Netflix, Hulu, Disney+) cannot offer:

Project Gutenberg (2018) is a highly acclaimed Hong Kong action thriller directed by Felix Chong, starring legendary actors Chow Yun-fat Aaron Kwok