User blog comment:LegerPrime/Godzilla Collection/@comment-25285745-20160513040417/@comment-25285745-20160513230056

The problem is that Toho didn't have a deal with the American distributors like the one they have with Universal. Toho doesn't own King Kong, so they made a deal with Universal (who represented RKO's copyright for Kong at the time) that Universal could own the rights to the American/international version of the film while Toho owns the Japanese version. This deal was made as a perpetual agreement with no expiration, so unless Toho and Universal actually enter legal negotiations, we won't ever see a legitimate release of the Japanese version of the film in the United States.