thanks for all the answers.It was not about DRM protected content and i found a way to get the book from a deeply hidden library volume on the mac and finally got it into calibre via zip and import.
Booting my mac today i found my lib empty (the copy had happened a couple of boots before nad the lib was present..).
Not a too serious issue for me, but a confirmation for my decision to never ever make use of apple's ibook malware.
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