Lots of TV shows before 1970 weren't renewed or had copyright notice errors, making them PD -- many of them on archive.org: https://infogalactic.com/info/List_o

Lots of TV shows before 1970 weren't renewed or had copyright notice errors, making them PD -- many of them on archive.org: https://infogalactic.com/info/List_of_TV_series_with_episodes_in_the_public_domain https://infogalactic.com/info/List_of_TV_series_with_episode...