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Old 10-07-2023, 09:27 PM   #1
disako4938
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Calibre: Error communicating with Kobo device
hello guys, i'm getting following error while trying to send a book to my clara. what's weird is that i'm only getting this error for 1 of my book and not the others.

Quote:
calibre, version 6.27.0
ERROR: Error: Error communicating with device

Failed to find obfuscation key

Traceback (most recent call last):
File "/usr/lib/calibre/calibre/gui2/device.py", line 104, in run
self.result = self.func(*self.args, **self.kwargs)
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File "/usr/lib/calibre/calibre/gui2/device.py", line 636, in _upload_books
return self.device.upload_books(files, names, on_card,
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File "calibre_plugins.kobotouch_extended.device.driver" , line 425, in upload_books
return super(KOBOTOUCHEXTENDED, self).upload_books(
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File "/usr/lib/calibre/calibre/devices/kobo/driver.py", line 2218, in upload_books
self._modify_epub(file, mi)
File "calibre_plugins.kobotouch_extended.device.driver" , line 207, in _modify_epub
container = KEPubContainer(infile, common.log, self.clean_markup)
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ ^^^
File "calibre_plugins.kobotouch_extended.container" , line 117, in __init__
super(KEPubContainer, self).__init__(epub_path, log, *args, **kwargs)
File "/usr/lib/calibre/calibre/ebooks/oeb/polish/container.py", line 1220, in __init__
self.process_encryption()
File "/usr/lib/calibre/calibre/ebooks/oeb/polish/container.py", line 1346, in process_encryption
raise ObfuscationKeyMissing('Failed to find obfuscation key')
calibre.ebooks.oeb.polish.container.ObfuscationKey Missing: Failed to find obfuscation key
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Old 10-07-2023, 09:38 PM   #2
Comfy.n
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Hi,
I would try an Epub to Epub reconversion, then send this new EPUB file, see:

https://www.mobileread.com/forums/sh...d.php?t=315520

edit: it could also be related to embedded fonts
https://www.mobileread.com/forums/sh...d.php?t=241480
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Old 10-07-2023, 10:23 PM   #3
disako4938
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Device: Kobo Clara HD
Quote:
Originally Posted by Comfy.n View Post
Hi,
I would try an Epub to Epub reconversion, then send this new EPUB file, see:

https://www.mobileread.com/forums/sh...d.php?t=315520

edit: it could also be related to embedded fonts
https://www.mobileread.com/forums/sh...d.php?t=241480
huh, converting epub worked. weird. first time this has happened. anyway, thanks a lot for your help! cheers!
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Old 10-07-2023, 11:02 PM   #4
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I've seen a similar error where the font obfuscation key has been damaged by modifying the dc:identifier metadata and the obfuscated fonts were not removed from the ePub.

You might want to read Font obfuscation in EPUBs and why you shouldn't change the dc:identifier after exporting from InDesign and Font Embedding for Open Container Format Files for more information.
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Old 10-07-2023, 11:03 PM   #5
Comfy.n
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Quote:
Originally Posted by disako4938 View Post
huh, converting epub worked. weird. first time this has happened. anyway, thanks a lot for your help! cheers!
you're welcome
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