westerns and B&W movies

[buckshot]

i'm having a screening of ''the searchers'' and ''unforgiven'' for my dad and a few of his friends to show how amazing these look on blu-ray. but seeing how beautiful and vibrant monument valley looks on blu-ray makes me want more technicolor movies on blu-ray. not only that, but old black and white movies as well. i've read the few threads about ''what do you want to see on blu-ray'' and ''spagehtti westerns'' but I want to know who owns the rights to such amazing movies as ''rio grande'', ''the quite man'', ''citizen kane'', ''big country'', ''moby dick'', ''to kill a mockingbird'', ''inherit the wind'', all these classics of technicolor and b&w. has there been any news? rko studios no longer exists, so who bought them?