Documentaries, films in the public domain, short films, television shows, etc. may be available through sites such as Internet Archive, YouTube, Vimeo, or others. Below are some possible resources:
Some Netflix Original educational documentaries are available for one-time educational screenings. Available titles will display a "grant of permission" on their details page. To locate titles available for educational screenings, go to Netflix Media Center, choose "Only On Netflix," and then "All Alphabetical."
Netflix has also made a small number of documentaries and series available through YouTube.