To expound on that a little, here is what official German Law states:
Article 65 Joint Authors, cinematographic works
(1) If copyright is owned by several joint authors (Article 8), it shall expire 70 years after the death of the last surviving author.
(2) In the case of cinematographic works and works which are produced in a similar way to cinematographic works, copyright shall expire 70 years after the death of the longest-living of the following persons: the principal director, the author of the screenplay, the author of the dialogues, the composer of the music composed for the cinematographic work in question.
Soooo, it would seem that if one were to find out when Mime Misu (the director) died, and when anyone else listed above keeled over, one may, or may not be in the clear....yet. However! If the makers of the film granted their rights to the producers or producing company (Continental Film), then read on....
Article 94 Protection of Producers of Films
(1) The producer of a film shall have the exclusive right to reproduce, distribute and use for public presentation or broadcasting the video recording or video and audio recording on which the cinematographic work is fixed. The film producer shall further have the right to prohibit any distortion or abridgment of the video recording or video and audio recording which may jeopardize his legitimate interests.
(2) The right shall be transferable.
(3) The right shall expire 50 years after the publication of the video recording or video and audio recording or, if its first legal use for public communication took place earlier, after the latter; however, it shall expire 50 years after production if the video recording or video and audio recording has not been published or legally used for public communication during such period.
So, one might be in the clear now anyway. I present this information for academic consideration only, and do not intend it as advice.
For the full text (in English) of the fascinating 'ins and outs' of German copyright law, see here:
http://www.iuscomp.org/gla/statutes/UrhG.htm#89