"This archive is a treasure trove unrivalled in historical and cultural significance that should never be forgotten."[0]
However, I am left wondering why "[u]ploading the films to YouTube seemed like the best way to make sure of that." Perhaps fittingly, there's no clear indication which licence, if any, is applicable.
What could've possibly impeded a parallel upload to the Internet Archive?
[0] https://britishpathe.wordpress.com/2014/04/17/british-pathe-...