Not really 'uncopyrighted'.
In most cases stuff is always copyrighted - often depending on the country and local law (i
think the USA is one of the few exceptions - but no hard facts ehre). There is enough legalese in this to keep hordes of lawyers busy for eons to come :-/
My use of the words "Public Domain" most probably was not the most exact way to describe NASA stuff though
- See blondandys comment.
Werner