I checked and changed all the writerdata of my (7.000!) books. First in Calibre and then in iTunes. I found out that this didn't result in anything. Someone advised me to look at Sigil and yes, that works. Only problem is that I have to open all my books one by one. Or am I wrong? Is there a possibility to change the megadata in Sigil in the same way as for instance in Calibre?
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