Kljuc ble utgitt 9. juli 1965.

Kljuc ble regissert av Vanča Kljaković, Krsto Papić, Antun Vrdoljak.

Kljuc har en spilletid på 1t, 44m.

Segment "Duga ulica": A young man named Boris and a girl, Vera, live in the same neighborhood. They meet one night when she loses her key. Boris invites her to spend the night at his place; Segment "Cekati": Married students, Ivan and Sonja, live in an old woman's apartment. She is sick and the couple hopes that she will die soon, so that they may inherit her apartment; Segment "Poslije predstave": A husband and a wife lose the key to their apartment and have to spend the night in a hotel. The experience is wonderful and renews their feelings for each other, if only for a night.

Hovedpersonene i Kljuc er Boris (Božidar Boban), Vera (Jagoda Kaloper), Milicajac (Kruno Valentić).

Kljuc er en Drama-film.

Kljuc har en publikumsvurdering på 7 av 10.