Well, that's the - bitter - end of the whole story surrounding the Kästner quotes. Thus a great poet is defamed by stupid lawyers and stupid laws more than it happened during his lifetime - simply by the fact that people think they have rights to his thoughts that run counter to the dissemination of his ideas. Kästner would probably have written a few biting remarks about it, I can only be sad and hope that the poems of one of my favorite poets are still known when the copyright has expired - which, given the fact that teachers are striking him from the curriculum, is rather questionable.
The banana republic Germany rages not only among politicians. The nation of poets and thinkers, fettered by miserable petty bureaucracy.
At Industrial Technology & Witchcraft I found the original article.