New
#11
I found an article that pertains to this, which says:
Berne Convention for the Protection of Literary and Artistic Works - Wikipedia, the free encyclopediaFor cinematography the minimum is 50 years after first showing, or 50 years after creation if it hasn't been shown within 50 years after the creation. Countries under the older revisions of the treaty may choose to provide their own protection terms, and certain types of works (such as phonorecords and motion pictures) may be provided shorter terms.
Although the Berne Convention states that the copyright law of the country where copyright is claimed shall be applied, article 7.8 states that "unless the legislation of that country otherwise provides, the term shall not exceed the term fixed in the country of origin of the work", i.e. an author is normally not entitled a longer copyright abroad than at home, even if the laws abroad give a longer term. This is commonly known as "the rule of the shorter term". Not all countries have accepted this rule.
The Berne Convention authorizes countries to allow "fair" uses of copyrighted works in other publications or broadcasts.[1] The Agreed Statement of the parties to the WIPO Copyright Treaty of 1996 states that: “It is understood that the mere provision of physical facilities for enabling or making a communication does not in itself amount to communication within the meaning of this Treaty or the Berne Convention.”[2] This language may mean that Internet service providers are not liable for the infringing communications of their users.[2]
If I'm reading that correctly, it would mean that anything released in the US in 1960 or before, if not aired after that date, is no longer protected under US copyright law.