Why dedrm cannot decrypt in sometime ?

[Nellypride]

It is in same computer and same Kindle version :

PC OS : Windows 7 Pro 32bit
Kindle version : 1.17
Calibre version : 3.35
DeDem version : 6.61

For example , I can decrypt one .azw file and save to jpg .
But after next day I import same .azw file to Calibre , decrypt fail .

Following is the log when fail :

================================

calibre Debug log
calibre 3.35 embedded-python: True is64bit: False
Windows-7-6.1.7601-SP1 Windows ('32bit', 'WindowsPE')
('Windows', '7', '6.1.7601')
Python 2.7.12+
Windows: ('7', '6.1.7601', 'SP1', u'Multiprocessor Free')
Interface language: None
Successfully initialized third party plugins: DeDRM (6, 6, 1) && KindleUnpack - The Plugin (0, 81, 5)
calibre 3.35 embedded-python: True is64bit: False
Windows-7-6.1.7601-SP1 Windows ('32bit', 'WindowsPE')
('Windows', '7', '6.1.7601')
Python 2.7.12+
Windows: ('7', '6.1.7601', 'SP1', u'Multiprocessor Free')
Interface language: None
Successfully initialized third party plugins: DeDRM (6, 6, 1) && KindleUnpack - The Plugin (0, 81, 5)
Turning on automatic hidpi scaling
devicePixelRatio: 1.0
logicalDpi: 96.0 x 96.0
physicalDpi: 72.035450517 x 72.0
Using calibre Qt style: True
[0.00] Starting up...
[0.02] Showing splash screen...
[0.20] splash screen shown
[0.20] Initializing db...
[0.22] db initialized
[0.22] Constructing main UI...
[2.20] main UI initialized...
[2.20] Hiding splash screen
[33.93] splash screen hidden
[33.93] Started up in 33.93 seconds with 1 books
DeDRM v6.6.1: Trying to decrypt B079YP11QG_EBOK.azw
Using Library AlfCrypto Python
MobiDeDrm v0.42.
Copyright © 2008-2017 The Dark Reverser, Apprentice Harper et al.
Decrypting Kindle Format 8 ebook: [Book Name]
Got DSN key from database default_key
Found 4 keys to try after 0.5 seconds
Crypto Type is: 2
File is encoded with PID cxFZvv++9G.
Decrypting. Please wait . . . . done
Decryption succeeded after 1.2 seconds
Running file type plugin DeDRM failed with traceback:
Traceback (most recent call last):
File "site-packages\calibre\customize\ui.py", line 172, in _run_filetype_plugins
File "calibre_plugins.dedrm.__init__", line 621, in run
File "calibre_plugins.dedrm.__init__", line 574, in KindleMobiDecrypt
File "calibre_plugins.dedrm.mobidedrm", line 407, in getFile
IOError: [Errno 22] Invalid argument
C:\Program Files\Calibre2\app\pylib.zip\dateutil\parser.py:60 1: UnicodeWarning: Unicode equal comparison failed to convert both arguments to Unicode - interpreting them as being unequal
Added [Book Name] to db in: 3.5
Added 1 books in 5.2 seconds
Added B079YP11QG EBOK to db in: 3.7
Added 1 books in 4.1 seconds
isEncrypted = True

========================================

In KindleUnpack the lock red color and cannot export .

But after I reboot computer . It work fine .

Do anyone know why ?

*** My computer have two user account do it is the factor ?

[theducks]

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