Thread: Dealing with Kindle ebooks in calibre
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Old 03-09-2026, 05:22 PM   #1359
texasnightowl
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Posts: 846
Karma: 2873645
Join Date: Jul 2008
Location: Texas
Device: PW5, Oasis 3, K4B(NT), K3/KK
I purchased a new book today and sent it to my Oasis.

10th gen Oasis 3, 5.18.2

Windows 11
Calibre 7.26
NoDRM 10.0.9 (alpha iirc)
KFX input 2.29

fwiw, I have at least 5 serial numbers in my setup (an old K3, my K5, Oasis 3, 11th gen PW, and an old K3 that belonged to my dad).

Anyway, the new test today DID work though it also has several lines in the log where it failed and "trying next fallback" but eventually it succeeded. I assume the failures were due to the multiple serial numbers I have.

So...still good here for now...?

Code:
DeDRM v10.0.9: Trying to decrypt svyv5l76.kfx-zip
Decrypting KFX-ZIP ebook: svyv5l76
Got DSN key from database default_key_1740288937
Found 9 keys to try after 0.2 seconds
Decrypting KFX DRM voucher: voucher
Decryption failed, trying next fallback 

##12 more lines of the same message

Traceback (most recent call last):
  File "C:\Users\myname\AppData\Roaming\calibre\plugins\DeDRM.zip\kfxdedrm.py", line 106, in decrypt_voucher
  File "C:\Users\myname\AppData\Roaming\calibre\plugins\DeDRM.zip\ion.py", line 1390, in decryptvoucher
  File "C:\Users\myname\AppData\Roaming\calibre\plugins\DeDRM.zip\ion.py", line 1376, in decryptvoucher
  File "C:\Users\myname\AppData\Roaming\calibre\plugins\DeDRM.zip\ion.py", line 784, in pkcs7unpad
  File "C:\Users\myname\AppData\Roaming\calibre\plugins\DeDRM.zip\ion.py", line 124, in _assert
Exception: Incorrect padding - Wrong key
Decryption failed, trying next fallback 

##12 more lines of the same message

Traceback (most recent call last):
  File "C:\Users\myname\AppData\Roaming\calibre\plugins\DeDRM.zip\kfxdedrm.py", line 106, in decrypt_voucher
  File "C:\Users\myname\AppData\Roaming\calibre\plugins\DeDRM.zip\ion.py", line 1390, in decryptvoucher
  File "C:\Users\myname\AppData\Roaming\calibre\plugins\DeDRM.zip\ion.py", line 1376, in decryptvoucher
  File "C:\Users\myname\AppData\Roaming\calibre\plugins\DeDRM.zip\ion.py", line 784, in pkcs7unpad
  File "C:\Users\myname\AppData\Roaming\calibre\plugins\DeDRM.zip\ion.py", line 124, in _assert
Exception: Incorrect padding - Wrong key
Decryption failed, trying next fallback 
Decryption succeeded
KFX DRM voucher successfully decrypted
Decrypting KFX DRMION: ##title removed.kfx
Decryption succeeded after 0.2 seconds
DeDRM v10.0.9: Finished after 0.2 seconds
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