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Old 10-03-2024, 03:00 AM   #1
koboist
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Epub without DRM, but "not authorized to open"
A friend got the "not authorized to open" message on their Kobo Clara 2E (tested firmware versions 4.35 to 4.38) and asked me to test that epub on my Kobo Glo. I was able to read the epub just fine. I also inspected the file, but there was no indication that it contained any kind of DRM. Both devices have never enabled WiFi.

Why is the Kobo Clara 2E not authorized to open that epub?
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Old 10-03-2024, 04:35 AM   #2
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Reboot the Clara. That bug pops up now and then. It seems to be a problem with RMSDK (the EPUB reading engine), and there's probably nothing wrong with the book.
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Old 10-03-2024, 06:39 AM   #3
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Thank you. We had already tried rebooting, deleting/re-adding the epub and flashing different firmware versions. It did not help. In the end we tried a factory reset and that actually helped.

Weird bug ...
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Old 10-03-2024, 07:17 AM   #4
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Originally Posted by Aleron Ives View Post
Reboot the Clara. That bug pops up now and then. It seems to be a problem with RMSDK (the EPUB reading engine), and there's probably nothing wrong with the book.
Hmm. I've never actually seen this bug, and I read epubs on my Libra 2. I've read about it happening here, though. I wonder why it has not happened to me?
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Old 10-03-2024, 12:53 PM   #5
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Hmm. I've never actually seen this bug, and I read epubs on my Libra 2. I've read about it happening here, though. I wonder why it has not happened to me?
You edit your eBooks and validate them. So you know the code is at least valid.
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Old 10-03-2024, 12:54 PM   #6
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Quote:
Originally Posted by koboist View Post
A friend got the "not authorized to open" message on their Kobo Clara 2E (tested firmware versions 4.35 to 4.38) and asked me to test that epub on my Kobo Glo. I was able to read the epub just fine. I also inspected the file, but there was no indication that it contained any kind of DRM. Both devices have never enabled WiFi.

Why is the Kobo Clara 2E not authorized to open that epub?
If this ever happens again, load the ePub into the calibre editor and use epubcheck (editor plugin) and the editor's error checker. If there are errors, fix them and then load the ePub again.
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Old 10-03-2024, 01:32 PM   #7
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Originally Posted by JSWolf View Post
If this ever happens again, load the ePub into the calibre editor and use epubcheck (editor plugin) and the editor's error checker. If there are errors, fix them and then load the ePub again.
Jon; this is an issue that I've seen occur occasionally on many of my Kobo's. It has NOTHING to do with the ePub; it seems to be a sporadic bug in the Kobo f/w that is resolved via a reboot of the Kobo.
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Old 10-03-2024, 02:21 PM   #8
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Jon; this is an issue that I've seen occur occasionally on many of my Kobo's. It has NOTHING to do with the ePub; it seems to be a sporadic bug in the Kobo f/w that is resolved via a reboot of the Kobo.
I've never had this happen. I've had the Aura H2O since the weekend after Thanksgiving in 2014.

Besides, it cannot hurt to try just in case that is the reason (or not).
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Old 10-03-2024, 06:15 PM   #9
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In the end we tried a factory reset and that actually helped.
Wow! You're the first person I've seen to report that a factory reset was necessary. Usually rebooting the Kobo is enough to clear the error.
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Old 10-03-2024, 07:34 PM   #10
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Out of curiosity, mostly, was the book originally DRM-free or deDRM'd at some point?
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Old 10-07-2024, 05:15 AM   #11
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Out of curiosity, mostly, was the book originally DRM-free or deDRM'd at some point?
The epub has always been DRM free.
Last edited by koboist; 10-07-2024 at 05:18 AM.
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Old 10-07-2024, 07:58 AM   #12
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Out of curiosity, mostly, was the book originally DRM-free or deDRM'd at some point?
Happens even with ebooks from Gutenberg. It's a rare bug in ADE renderer, so not obvious what triggers it. Sometimes needs a reboot.
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Old 10-07-2024, 08:20 AM   #13
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Happens even with ebooks from Gutenberg. It's a rare bug in ADE renderer, so not obvious what triggers it. Sometimes needs a reboot.
Another thing to do is load the eBook into the editor and resave it.
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