CountryDate
USA 1 January 1948
Sweden 12 April 1948
Denmark 27 September 1948
Finland 11 March 1949
Japan 20 September 1949
Austria 20 March 1950
West Germany 9 November 1970 (TV premiere) (edited version)
Germany 30 November 2006 (TV premiere) (uncut version)

Also Known As (AKA)
Den låsta dörren Finland (Swedish title) / Sweden
Das Tor ins Verderben Austria
Dietro la porta chiusa Italy
Geheimnis hinter der Tür Germany
Hemmeligheden bag døren Denmark
Het geheim achter de deur Belgium (Flemish title)
Le secret au-delà de la porte Belgium (French title)
Le secret derrière la porte France
Lukitun oven salaisuus Finland
O Segredo da Porta Fechada Portugal
Salaisuus oven takana Finland (TV title)
Secret Beyond the Door USA (alternative spelling)
Secreto tras la puerta Spain

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