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The book has some DRM cryptography. Sadly the instruments to remove DRM that You can find on the Apprentice Half blog generally don't work for ebooks buyed within apps.
If You want to read Your ebook within calibre and then everywhere You want You must be sure, before to buy it, that it is possible remove DRM from it.
Assistance for DRM removing is not permitted here but in the Apprentice Half blog You can find the instruments, the relative readme and on the net more information.
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