There's an extensive selection of public domain feature films available, but video quality is universally extremely poor as users generally prefer low filesize over high bitrate. Some of the films ("Night of the Living Dead", Charlie Chaplin catalogue and Christopher Lee's "Horror Express" as notable examples) have been released on Blu-ray. Is it allowed to create a lossless copy of a Blu-ray disc and spread the film all over the Internet as a video file? I won't share "extras" (commentary tracks, making of documentaries) which may have been created and owned by the publisher, subtitles, menus and foreign or alternative audio tracks to avoid legal issues.
I don't know if all Blu-ray discs and DVDs have DRM (circumventing may be allowed under some jurisdictions) — DRM is out of the scope of the question as it is uncertain if restricting material free of intellectual property rights is in turn legal.