I did want to add this, though: I can imagine an instance where an individual or non-government enterprise might pay NASA to carry a payload into space for them or where such an enterprise might lease NASA’s equipment for a special mission. In such a case, the data collected during the period of the lease may be considered the property of the enterprise and thus be subject to the same protections afforded to data collected by the company whenever they use their own equipment.

Mind you, I don’t know that for fact; I’m merely speculating.

If they are copyright free, you can use ’em however you please. Otherwise, contact the holder and ask for permission.