Whenever an ePub file is opened with Calibre's ebook viewer, a bookmark file is created inside that ePub. This file does not store user bookmarks, it is automatically used by the program to remember the last used location inside the book.
More precisely this bookmark file is called
calibre_bookmarks.txt and is located in the
META-INF folder, inside the said ePub book main directory.
I'd like to know if there is an easy way of getting rid of these bookmark files from inside Calibre, ideally from multiple ePubs at once (doing it manually for every single ebook wouldn't be very handy), effectively cleaning them and restoring their "newness".