Koch didn't restore anything, just "remaster" the film. UCLA has not only the original nitrate successive exposure negatives, but backup positives, optical soundtrack negatives, isolated elements (main titles, music-only). UCLA is also the home of literally tons of film materials for the Republic library wonderfully preserved to be left untouched by the current rights holders.
It's completely surreal that such a treasure chest of prime film materials would not be utilized by rights holders.
It's completely surreal that such a treasure chest of prime film materials would not be utilized by rights holders.