hello friends,
I proudly can tell you that I solved my problem by trying out something different today!!
I converted an original file (in zip-mode) to a .mobi file, because I found out that the mobi file will keep the original author information and not the later added information. (maybe the .zip file does the same, but I didn't try out).
I copied the .mobi files to an seperate file, and deleted the originals in calibre.
then I imported the .mobi-files - and voila - they all had only the original author information documented.
this I did with about 3000 files, because I had changed the information for the other about 500 files before - one by one.
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