In the USA, if public domain footage (specifically archival footage from WWII) has been recorded by a third party on a DVD or some other video source such as YouTube, does the third party have an ownership claim to that footage?
If the third party has invested $$ in restoring the film, etc. I can see where it would be unfair to benefit from their efforts, however, it's not usually possible to determine whether they have done this.
RalphM