Every single video, audio file and image on this website is judged to be in the public domain.
This means that copyright may never have existed in the work in the first place (forinstance in the USA if a movie was produced before 1923 then copyright never existed).
It could also mean that copyright expired for some reason. In the USA, before 1976, copyright needed to be renewed at certain anniversaries and if it wasn't the work fell out of copyright.
This website is hosted in the USA and so is bound by laws in that country. It is possible that different copyright laws exist in other countries.
The content on this website has been up many years and so I am confident now that no claims will be made, but it is possible.