Do purchased DRM'ed ebooks have any personal user info stored in them? - Page 5

twowheels · 09-09-2020, 03:00 PM

We could also check by having two people who have the same book in their purchased content download it at the same time (to ensure same version), and remove the DRM with the same version of the tools, then compare hashes.

JSWolf · 09-09-2020, 04:48 PM

Quote:

Originally Posted by twowheels

We could also check by having two people who have the same book in their purchased content download it at the same time (to ensure same version), and remove the DRM with the same version of the tools, then compare hashes.

If the eBooks are ePub or KF8, you can use the Calibre editor to load one and compare it against the other and you'll see what the differences are if any.

fogice · 09-24-2020, 04:39 PM

Quote:

Originally Posted by twowheels

We could also check by having two people who have the same book in their purchased content download it at the same time (to ensure same version), and remove the DRM with the same version of the tools, then compare hashes.

I'm willing to be one of these people. Amazon has books that go on sale for free every day, we could grab one of those.

But I don't know how to "compare the hashes". So I'll send a deDRM'd book to whoever wants to do the hard part.

JSWolf · 09-24-2020, 04:47 PM

Quote:

Originally Posted by fogice

I'm willing to be one of these people. Amazon has books that go on sale for free every day, we could grab one of those.

But I don't know how to "compare the hashes". So I'll send a deDRM'd book to whoever wants to do the hard part.

Yes, Kindle eBooks (KF8) do have a watermark in the OPF. It's very easy to remove if you want.

fogice · 09-24-2020, 06:05 PM

Quote:

Originally Posted by JSWolf

Yes, Kindle eBooks (KF9) do have a watermark in the OPF. It's very easy to remove if you want.

Ah. I didn't realize that someone had figured this out already. Was it discussed elsewhere on this board? My searching didn't find it, but I'm probably using the wrong terms.

shalym · 09-25-2020, 06:56 AM

Quote:

Originally Posted by JSWolf

Yes, Kindle eBooks (KF9) do have a watermark in the OPF. It's very easy to remove if you want.

I didn't realize that! Which ones are KF9 format? Is that a typo for KF8? Or is it a format that I didn't know about? Is there documentation somewhere on how to remove the watermark?

Shari

DiapDealer · 09-25-2020, 07:18 AM

Two Kindlebooks downloaded (at the same time) and liberated by two different people will never be identical. There's no need to test that. Without extra processing, the metadata sections will differ. Period. And a lot of the "extra processing" that's available out there (for kindlebooks) tends to do its work in a brutish manner that strongly suggests a lack of knowledge (by the authors) RE the subtleties of the binary format they're attempting to pointlessly diddle.

DiapDealer · 09-25-2020, 07:39 AM

Quote:

Originally Posted by fogice

But I don't know how to "compare the hashes". So I'll send a deDRM'd book to whoever wants to do the hard part.

I know this was meant in the spirit of discovery, experimentation and all, but even so: please don't use the Mobileread forums to announce your intentions to violate copyright by sharing DeDRMed ebooks.

JSWolf · 09-25-2020, 07:44 AM

Quote:

Originally Posted by shalym

I didn't realize that! Which ones are KF9 format? Is that a typo for KF8? Or is it a format that I didn't know about? Is there documentation somewhere on how to remove the watermark?

Shari

A typo for KF8. Sorry.

JSWolf · 09-25-2020, 07:46 AM

I do know how to remove the watermark from KF8 eBooks. But that is something not allowed to say here.

pdurrant · 09-25-2020, 08:07 AM

Ah, you know how to remove the watermarks you know about...

Personally, I'd be delighted if my purchased ebooks has a pretty 'Ex Libris' page with purchase details added by the store.

I really don't care if they have hidden identifying info.

09-25-2020, 07:18 AM	#67
DiapDealer Grand Sorcerer Posts: 27,552 Karma: 193191846 Join Date: Jan 2010 Device: Nexus 7, Kindle Fire HD	Two Kindlebooks downloaded (at the same time) and liberated by two different people will never be identical. There's no need to test that. Without extra processing, the metadata sections will differ. Period. And a lot of the "extra processing" that's available out there (for kindlebooks) tends to do its work in a brutish manner that strongly suggests a lack of knowledge (by the authors) RE the subtleties of the binary format they're attempting to pointlessly diddle. Last edited by DiapDealer; 09-25-2020 at 07:29 AM.

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09-09-2020, 03:00 PM	#61
twowheels Wizard Posts: 1,790 Karma: 13412766 Join Date: Nov 2010 Device: Kobo Clara HD, iPad Pro 10", iPhone 15 Pro	We could also check by having two people who have the same book in their purchased content download it at the same time (to ensure same version), and remove the DRM with the same version of the tools, then compare hashes.

09-25-2020, 07:46 AM	#70
JSWolf Resident Curmudgeon Posts: 73,998 Karma: 128903378 Join Date: Nov 2006 Location: Roslindale, Massachusetts Device: Kobo Libra 2, Kobo Aura H2O, PRS-650, PRS-T1, nook STR, PW3	I do know how to remove the watermark from KF8 eBooks. But that is something not allowed to say here.

09-25-2020, 08:07 AM	#71
pdurrant The Grand Mouse 高貴的老鼠 Posts: 71,510 Karma: 306214458 Join Date: Jul 2007 Location: Norfolk, England Device: Kindle Voyage	Ah, you know how to remove the watermarks you know about... Personally, I'd be delighted if my purchased ebooks has a pretty 'Ex Libris' page with purchase details added by the store. I really don't care if they have hidden identifying info.

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