Can you watch movies online for free and legally?

Free movies are available for online viewing on archive.org, as well as services such as YouTube.com. These movies are generally in the public domain, though some may be available as part of a promotion.

Archive.org features an extensive archive of public domain media, including music, television and movies. Movies available on the site include unlicensed films uploaded by their creators, as well as feature films in the public domain, which occurs when the copyright on them lapses or isn't renewed. Certain movies are available for free on YouTube. These movies include those in the public domain, as well as movies produced by major studios that have been made available for a variety of reasons.