Obok DeDRM v3.1.2 failing with error "Tis not added because it couldn't be decrypted"

[shanemcquillan]

I just purchased my first book on Kobo and I'm trying to de-DRM it. I downloaded the Kobo app for macOS, after which I my purchased book appeared in the Obok DeDRM menu in Calibre. Unfortunately I'm seeing the error message "Tis not added because it couldn't be decrypted". Here's the output from calibre-debug:

Running Obok DeDRM v3.1.2
Obok v3.1.1
Copyright © 2012-2014 Physisticated et al.
Error parsing Kobo plist: no legacy user key found.
Found 6 possible keys to try.
DEBUG:    9.0 BookListTableWidget:get_books - book_num: 0
DEBUG:    9.0 BookListTableWidget:get_books - book: Tis
DEBUG:    9.0 InterfacePluginAction::launchObok - number of books to decrypt: 1
Obok DeDRM v3.1.2 - Decrypting Tis
Trying key:  3cc4be70ca48d81f003aed99c46ae912
Bad XML:  ш??
Decryption failed, trying next key.
Trying key:  cf9c8f9a044f00618b90e673e81dd784
Bad XML:  c<?N
Decryption failed, trying next key.
Trying key:  cf9c8f9a044f00618b90e673e81dd784
Bad XML:  c<?N
Decryption failed, trying next key.
Trying key:  788e2a88587bd0ece6d85c64783f86e7
Bad XML:  x?5![
Decryption failed, trying next key.
Trying key:  8486a1e58691937b0afaf08063af8b9a
Bad XML:  >??
Decryption failed, trying next key.
Trying key:  8486a1e58691937b0afaf08063af8b9a
Bad XML:  >??
Decryption failed, trying next key.
Obok DeDRM v3.1.2 - Couldn't decrypt Tis
DEBUG:    9.0 DecryptAddProgressDialog::do_book_action - book decryption failed: 'Tis'
Obok DeDRM v3.1.2 - wrapping up results.

Version info:

macOS 10.15.5
Calibre 4.23.0
Obok DeDRM v3.1.2
DeDRM 6.5.5
Kobo Desktop Edition 4.24.11789

Would appreciate assistance on this one. Happy to help with any debugging steps.

[shanemcquillan]

Closing. Turns out I was using a really old version of Obok DeDRM. No issues with the latest.

[ChristopheRoyer21]

I would like to open this issue again. Here is the log for me

Obok DeDRM v7.2.1 - Decrypting Magical Girl Raising Project, Vol. 10 (light novel)
Trying key:  b'0804f9d890ea4bbb6656ba171d00b8a1'
Checking text:b'\x0b\xc89[\x88\x97\x83#\x1b5':
Perhaps utf-8 without BOM
Bad character at 0, value 11
Decryption failed, trying next key.
Trying key:  b'a7b846f352cec5ad2d0d2a7d3e137f3b'
Checking text:b'\xfc\xce\xfc\xeec)u\x81^)':
Perhaps utf-8 without BOM
Bad character at 0, value 252
Decryption failed, trying next key.
Trying key:  b'd36bbb41f788f987ace2bcd1533818d9'
Checking text:b'\x13\x00tF\xde^\xb2CF!':
Perhaps utf-8 without BOM
Bad character at 0, value 19
Decryption failed, trying next key.
Trying key:  b'2cc8390969bb535f0649d20425fab620'
Checking text:b'\xf6\xdb\x1e\xa4\xcb\xf8\x13o\x8a]':
Perhaps utf-8 without BOM
Bad character at 0, value 246
Decryption failed, trying next key.
Trying key:  b'89cab5e989a92461f71798ed47b7b32c'
Checking text:b'\x1ch\xb0\x9a\x81\xaeH=d\xcf':
Perhaps utf-8 without BOM
Bad character at 0, value 28
Decryption failed, trying next key.
Trying key:  b'ba1e176eaf9f271750fe4a275c9a7e99'
Checking text:b"\xe55F^H\xaa\x9b'\nX":
Perhaps utf-8 without BOM
Bad character at 0, value 229
Decryption failed, trying next key.
Trying key:  b'fe3d7e65b07d9d0707a9f6a9fb926ef7'
Checking text:b'\x17\xc1\xc7\x0cM8\r\xff\x01\xd3':
Perhaps utf-8 without BOM
Bad character at 0, value 23
Decryption failed, trying next key.
Trying key:  b'b56c76833ed2f9dda7e53849cd8126bd'
Checking text:b'}:2\x0bt\xc0XkmF':
Perhaps utf-8 without BOM
Bad character at 3, value 11
Decryption failed, trying next key.
Trying key:  b'f661fc0930112c311ae0627de79dfd85'
Checking text:b'\x84DQ\x97@\xebV\xc2\x17\x7f':
Perhaps utf-8 without BOM
Bad character at 0, value 132
Decryption failed, trying next key.
Trying key:  b'241793e490dbb565ab9fa55cf66ac7ed'
Checking text:b'\xa7\xcc`\xad\x89\x06\xef\x9cJM':
Perhaps utf-8 without BOM
Bad character at 0, value 167
Decryption failed, trying next key.
Trying key:  b'edcfd5b14781b18552a1edb9c6c46a8e'
Checking text:b'\xb3\xb5Wb{\xbf\x99\xf5\xe9\xf9':
Perhaps utf-8 without BOM
Bad character at 0, value 179
Decryption failed, trying next key.
Trying key:  b'a61818ac2e78f800137d1dd442aa391e'
Checking text:b'\x85&\xd6\xf5\x8eg\xf2\x19\x07\xe7':
Perhaps utf-8 without BOM
Bad character at 0, value 133
Decryption failed, trying next key.
Obok DeDRM v7.2.1 - Couldn't decrypt Magical Girl Raising Project, Vol. 10 (light novel)
DEBUG:   35.6 DecryptAddProgressDialog::do_book_action - book decryption failed: 'Magical Girl Raising Project, Vol. 10 (light novel)'
Obok DeDRM v7.2.1 - wrapping up results.

I use the obok_plugin I got in the zip of DeDRM v7.2.1 and I have the most recent version of Calibre

[ElleKayEm]

Give the one attached to this comment a try: #1718 (comment)

That issue is still open and discussing problems with the current Obok 7.2.1.

[ChristopheRoyer21]

In the end, I saw in a ticket that version 7.1.0 works and I tried it and it was fine. I'll look at the issue of the encryption key too. Thanks for the fast reply!