Quote:
Originally Posted by AnotherCat
As it opens outside Calibre, try doing that and then printing it to a new pdf file using a tool such as PrimoPDF or PDFCreator. This will often result in the newly created file being cleaned of redundant remnants of previous security settings.
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Thank you. You're right, it must be an issue with the file itself. I now simply exchanged the file in the library with the file that was not imported, and that "solved" the issue for now.