Britain’s National Archives have started putting their government-produced public information films online, starting with films from 1945-1951. Everything from a 1948 cartoon explaining the benefits of the newly formed National Insurance Act (Britain’s welfare system) to a film showing how to use the pedestrian crossing (crosswalk).
Material is released under the Crown Copyright license, which is essentially a non-commercial-use license with the added stipulation that the material is “re-used accurately and not used in a misleading context.”
(Thanks to Andy for the link.)