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"I received only irony, sarcasm, idiocy."
OK, how about a dash of suspicion
You'd get more sympathy if you present the user case for why a legit purchased book which you have added to/edited in calibre needs a data wipe. I can't think of anything legit you could be planning to do with such book(s) , that needs such a feature.
your copy of such books is bought (licenced actually) for your use only. it should not be en-route to others
if they are public domain, then just share the download links and not the library files
if you must "cover your tracks", then perhaps take up your own suggestion of using a text editor
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