Just FYI I spoke to an entertainment lawyer I work with who started in the film business and he says that basically CBS owns the images. HOWEVER, even if the images were Public Domain, if you do something substantial to alter it, then your specific alternation (a "transformative" work) is copyrightable though the original remains PD. In the case of photo restoration, it is not a transformative work, but can be considered "added work" and, likewise, not free for someone to use just because they want to. For instance, Plan 9 From Outer Space may be in the public domain, but if a company colorizes is their version is added work and cannot be copied or used without permission.
He told me the legal options, but I don't think those should be aired here.