Amazon and DRM changes - Page 197

jhowell · 05-20-2025, 10:03 AM

Quote:

Originally Posted by jhowell

I believe that BookFab will outlast older K4A.

I was wrong. I did not expect Amazon to respond that quickly.

Quote:

Originally Posted by DNSB

Currently we have a bet whether his K4A or BookFab install will stop working first.

So, who won the bet?

Quoth · 05-20-2025, 10:31 AM

Quote:

Originally Posted by ownedbycats

I'll be surprised if they refund. If you bought through credit card, there's the chargeback option.

Their customer list could be valuable

Anyone interested in buying a bridge? Good income from the tolls.

ownedbycats · 05-20-2025, 10:40 AM

Quote:

Originally Posted by jhowell

So, who won the bet?

Depends on if they can get it fixed (then it'lll break again).

lkmiller · 05-20-2025, 10:43 AM

Quote:

Originally Posted by Quoth

Their customer list could be valuable

Anyone interested in buying a bridge? Good income from the tolls.

Pretty sure Amazon already has Bookfab's customer list.

jonathan2022 · 05-20-2025, 10:51 AM

It will break again. Why. Because it allows kindle unlimited books. No faster away of getting Amazon to close a hole. They will have to have several other options for customers if they are going to survive .

lkmiller · 05-20-2025, 02:05 PM

Don't imagine it will work again unless DeDRM is updated.

John F · 05-20-2025, 02:44 PM

Quote:

Originally Posted by xyzzy_foo

...

If you trust DVDFab, they will crack the new DRM as soon as it changes. That's what they've been doing on a lot of platforms.

The above was in reference to of Kobo DRM changed, but the same should apply to Amazon DRM? I have my doubts. Let's see how quickly "as soon as it changes" means.

DNSB · 05-20-2025, 06:04 PM

Quote:

Originally Posted by DNSB

Currently we have a bet whether his K4A or BookFab install will stop working first.

Quote:

Originally Posted by jhowell

So, who won the bet?

I did. K4A still has a couple of days to go and BookFab is dead for now. We are now waiting to see if anything happens to his throwaway Amazon account. I'm going to enjoy that coffee when we next meet up.

Sats · 05-21-2025, 07:53 AM

Right. I guess I will "poke the bear", so to speak.
I have developed a crude utility that, at least for me (caveats below), allows to extract keys for the books downloaded by Kindle 2.7.1(70978). I have put ability to ingest resulting "keyfiles" into my deDRM fork. As this is the first time I touched PyQT, it looks rather slapdash. Repo also has source code of the utility, while the (pre)release has a copy of executable, sans runtime. It was compiled in VS2022.
Now, I am being a little vague, both intentionally and because I suck at explaining things. Also, I was going to put in some details about its usage here, but that might go against "too detailed" rule of this thread. And I don't want to post too much on github, for no good reason. So, well. People who can guess, will guess.

Caveats/notes:

Now that I am putting it out, Amazon will probably fix it soon. It is easy enough. It might still work for some books, if one preserves older dlls. How soon? No idea. Maybe longer if it stays forgotten in this thread
It is too technical and probably temporary to put in upstream deDRM, IMO.
Windows (x86 support) only. That is the only platform I have reliable access to.
I may answer some questions about it, but not many and not for long.

bustacap · 05-21-2025, 10:03 AM

Quote:

Originally Posted by Sats

Right. I guess I will "poke the bear", so to speak.
I have developed a crude utility that, at least for me (caveats below), allows to extract keys for the books downloaded by Kindle 2.7.1(70978). I have put ability to ingest resulting "keyfiles" into my deDRM fork. As this is the first time I touched PyQT, it looks rather slapdash. Repo also has source code of the utility, while the (pre)release has a copy of executable, sans runtime. It was compiled in VS2022.
Now, I am being a little vague, both intentionally and because I suck at explaining things. Also, I was going to put in some details about its usage here, but that might go against "too detailed" rule of this thread. And I don't want to post too much on github, for no good reason. So, well. People who can guess, will guess.

Caveats/notes:

Now that I am putting it out, Amazon will probably fix it soon. It is easy enough. It might still work for some books, if one preserves older dlls. How soon? No idea. Maybe longer if it stays forgotten in this thread
It is too technical and probably temporary to put in upstream deDRM, IMO.
Windows (x86 support) only. That is the only platform I have reliable access to.
I may answer some questions about it, but not many and not for long.

sorry for the stupid question, but how to get the memdump? :P

extesy · 05-21-2025, 10:26 PM

Quote:

Originally Posted by Sats

Right. I guess I will "poke the bear", so to speak.

Amazing, it works! I was able to use it to strip DRM from one the books downloaded with K4PC 2.7.1.

DNSB · 05-22-2025, 12:56 AM

Quote:

Originally Posted by bustacap

sorry for the stupid question, but how to get the memdump? :P

Run K4PC, not sure if opening a book is needed but wouldn't hurt. Then open Task Manager, right click on the Kindle (32 bit) app and select Create memory dump file.

I added the created keyfile to the DeDRM plugin and it works with K4PC 2.7.1 on the two books I tested.

bustacap · 05-22-2025, 01:40 AM

Quote:

Originally Posted by DNSB

Run K4PC, not sure if opening a book is needed but wouldn't hurt. Then open Task Manager, right click on the Kindle (32 bit) app and select Create memory dump file.

I added the created keyfile to the DeDRM plugin and it works with K4PC 2.7.1 on the two books I tested.

thank you

Laburge · 05-22-2025, 04:09 AM

Quote:

Originally Posted by DNSB

Run K4PC, not sure if opening a book is needed but wouldn't hurt. Then open Task Manager, right click on the Kindle (32 bit) app and select Create memory dump file.

I added the created keyfile to the DeDRM plugin and it works with K4PC 2.7.1 on the two books I tested.

It's not working
https://www.mobileread.com/forums/at...1&d=1747900961
That I select a file that is open in K4PC, that I select a file that is not open in K4PC.
I get this answer all the time.
Tried to run specifically on Windows 7 X86 and I get the same response.
What am I doing wrong? (or Japanese operating system does not support this solution)

Laburge · 05-22-2025, 04:21 AM

Quote:

Originally Posted by Laburge

It's not working
https://www.mobileread.com/forums/at...1&d=1747900961
That I select a file that is open in K4PC, that I select a file that is not open in K4PC.
I get this answer all the time.
Tried to run specifically on Windows 7 X86 and I get the same response.
What am I doing wrong? (or Japanese operating system does not support this solution)

KRFKeyExtractor file does not work on XP because it is not 32 bit.
I don't understand what special conditions are needed for this utility.

05-21-2025, 07:53 AM	#2949
Sats Member Posts: 15 Karma: 1670198 Join Date: Jun 2023 Device: iPhone	Right. I guess I will "poke the bear", so to speak. I have developed a crude utility that, at least for me (caveats below), allows to extract keys for the books downloaded by Kindle 2.7.1(70978). I have put ability to ingest resulting "keyfiles" into my deDRM fork. As this is the first time I touched PyQT, it looks rather slapdash. Repo also has source code of the utility, while the (pre)release has a copy of executable, sans runtime. It was compiled in VS2022. Now, I am being a little vague, both intentionally and because I suck at explaining things. Also, I was going to put in some details about its usage here, but that might go against "too detailed" rule of this thread. And I don't want to post too much on github, for no good reason. So, well. People who can guess, will guess. Caveats/notes: Now that I am putting it out, Amazon will probably fix it soon. It is easy enough. It might still work for some books, if one preserves older dlls. How soon? No idea. Maybe longer if it stays forgotten in this thread It is too technical and probably temporary to put in upstream deDRM, IMO. Windows (x86 support) only. That is the only platform I have reliable access to. I may answer some questions about it, but not many and not for long.

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05-20-2025, 10:51 AM	#2945
jonathan2022 Zealot Posts: 146 Karma: 213232 Join Date: Mar 2022 Device: android	It will break again. Why. Because it allows kindle unlimited books. No faster away of getting Amazon to close a hole. They will have to have several other options for customers if they are going to survive .

05-20-2025, 02:05 PM	#2946
lkmiller Laura Posts: 1,502 Karma: 23000000 Join Date: Nov 2009 Device: Kobo Sage, Kobo Elipsa, Nook Glowlight 4 Plus, Kindle Oasis 2	Don't imagine it will work again unless DeDRM is updated.