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Old 06-21-2023, 03:58 AM   #2131
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Originally Posted by jhowell View Post
It works for me on books obtained from a Kindle device and from the latest version of Kindle for PC.

(...)

Whenever a new version of the DeDRM plugin has been released that breaks KFX DRM, Amazon has immediately switched to a different DRM scheme already implemented and ready to go in Kindle reader software. Perhaps Amazon will not bother at this point but the more you publicize your fork the greater the chance that Amazon will take notice and change the DRM in use to block it.
So I shouldn't be surprised if there are FW 5.15.1.2 in a few days?
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Old 06-21-2023, 08:28 AM   #2132
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Originally Posted by innocenat View Post
So I shouldn't be surprised if there are FW 5.15.1.2 in a few days?
They don't even need to do that.

eta: At least they haven't in the past. The tools would stop working the next day without any Kindle update.
Last edited by lkmiller; 06-21-2023 at 08:34 AM.
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Old 06-21-2023, 11:10 AM   #2133
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Originally Posted by innocenat View Post
So I shouldn't be surprised if there are FW 5.15.1.2 in a few days?
The changes are already buried in the firmware so no need for a new release. To quote @jhowell:
Quote:
Whenever a new version of the DeDRM plugin has been released that breaks KFX DRM, Amazon has immediately switched to a different DRM scheme already implemented and ready to go in Kindle reader software
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Old 06-21-2023, 03:21 PM   #2134
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Out of curiosity, did anybody try my modifications to dedrm plugins? They (and running debugger on Kindle) seemed easier than installing bluestacks to me, though I have little to no idea if they work for anybody else.
FWIW, I also have a fork with them, though i do not intend to maintain it.
Thank you. Can confirm that it works very well!
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Old 06-21-2023, 08:57 PM   #2135
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Originally Posted by DNSB View Post
The changes are already buried in the firmware so no need for a new release. To quote @jhowell:
I have no idea what is in Kindle firmware, since I don't have one. I only modified tools to work with Kindle for PC/Mac. From what I can tell, they did not add any new "versions" that were not in the tools already (~13 "keys" and 3 scramble algos that they can combine at will). But I cannot be sure. And I am not sure I got the third scramble correctly implemented, since I could not test it. We'll see, I guess. (3rd scramble is only in a fork)
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Old 06-21-2023, 10:14 PM   #2136
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Quote:
Originally Posted by Sats View Post
I have no idea what is in Kindle firmware, since I don't have one. I only modified tools to work with Kindle for PC/Mac. From what I can tell, they did not add any new "versions" that were not in the tools already (~13 "keys" and 3 scramble algos that they can combine at will). But I cannot be sure. And I am not sure I got the third scramble correctly implemented, since I could not test it. We'll see, I guess. (3rd scramble is only in a fork)
As far as I can tell Kindle e-readers and apps all have the same DRM. I believe that your third scramble is correct and should handle KFX DRM up to V28 with some exceptions due to incorrect keys in the key table. But there are ten more DRM schemes implemented with far more complicated algorithms and those are going to be much harder to defeat.
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Old 06-22-2023, 12:37 AM   #2137
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As far as I can tell Kindle e-readers and apps all have the same DRM. I believe that your third scramble is correct and should handle KFX DRM up to V28 with some exceptions due to incorrect keys in the key table. But there are ten more DRM schemes implemented with far more complicated algorithms and those are going to be much harder to defeat.
Another ten? Do you mean V9708, etc? They are in the key table. Or do you mean some other ones that use a different mechanism? If so, I would need a book with those if I were to take a look.
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Old 06-22-2023, 02:16 AM   #2138
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Another ten? Do you mean V9708, etc? They are in the key table. Or do you mean some other ones that use a different mechanism? If so, I would need a book with those if I were to take a look.
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Old 06-22-2023, 03:19 AM   #2139
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Old 06-22-2023, 10:22 AM   #2140
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Another ten? Do you mean V9708, etc? They are in the key table. Or do you mean some other ones that use a different mechanism?
Yes, I was referring to V9708 through V5683. Amazon uses stronger DRM for some books. That includes some expensive textbooks published by Pearson and some books published in English by Random House India.

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If so, I would need a book with those if I were to take a look.
An example that was mentioned earlier in this thread is I Hear You by Nidhi Upadhyay. The enhanced DRM applies even to the free sample. I tried your plugin on that and it did not work.
Last edited by jhowell; 06-23-2023 at 04:27 PM.
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Old 06-22-2023, 11:15 AM   #2141
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Yes, I was referring to V9708 through V5683.
An example that was mentioned earlier in this thread is I Hear You by Nidhi Upadhyay. The enhanced DRM applies even to the free sample. I tried your plugin on that and it did not work.
Ohh, you are right Well, if I have an example, I'll take a look later, as I said in PM.
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Old 06-23-2023, 04:19 AM   #2142
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I'm having a problem using Download and Transfer with two recent purchases. I didn't have issues last March using this method.

1) I purchased the books for my Kindle PW4. One cost money, and one was free.
2) I have DeDRM 10.0.3 installed with Calibre 6.21 on my Mac. My Kindle's serial code is input in the custom panel of DeDRM.
3) I select Download & Transfer via USB at the Kindle's Digital Content page
4) I've imported the downloaded azw3 and azw files via my watch folder and by dropping it into Calibre.
5) DRM remains locked.

Has something changed since March that I'm not accounting for? One of the books in question was published in 2013 on Amazon.com, so it technically shouldn't be giving me issues, right?

There are currently 143 pages on this thread, so if I missed the relevant post that answers this question, could you point me to it? Thanks.
Last edited by Cootey; 06-23-2023 at 04:40 AM.
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Old 06-23-2023, 05:05 AM   #2143
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Should be fine. Are you sure you chose the Paperwhite when downloading? Ask over at the GitHub if you are still having trouble.
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Old 06-23-2023, 01:30 PM   #2144
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Moderator Notice
It seems this thread seems to get more and more specific over time. Both in help being offered, and details being discussed. We (editors/mods) are partly to blame for letting it go so long, but it's time for a course correction. Please refrain from offering step-by-step help, and from discussing the technical details of Kindle's DRM technology (as well as the development of the tools necessary to remove it) here in open forum at MobileRead. Let's get back to posting links to where detailed help with DRM should take place. Thank you.
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Old 06-23-2023, 01:39 PM   #2145
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It seems this thread seems to get more and more specific over time. Both in help being offered, and details being discussed. We (editors/mods) are partly to blame for letting it go so long, but it's time for a course correction. Please refrain from offering step-by-step help, and from discussing the technical details of Kindle's DRM technology (as well as the development of the tools necessary to remove it) here in open forum at MobileRead. Let's get back to posting links to where detailed help with DRM should take place. Thank you.
I edited the original post to make note of this.
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