Adobe ADEPT DRM for PDF circumvented - Page 18

ilovejedd · 05-01-2009, 11:28 PM

609 bytes here.

joblack · 05-01-2009, 11:39 PM

Quote:

Originally Posted by ilovejedd

609 bytes here.

Very strange - I also have two people who have encrypted pdfs with an empty trailer ... check out your working encrypted pdfs with a hex editor. If there is a

trailer.<<>>.startref.$NUMBER.%%EOF

at the end and your Digital Editions is still showing it they have changed the format of the pdf again (Adobe also forced me to update my DE).

But without a trailer it goes against the official pdf reference (and shouldn't work)... anyway, if you have a working encrypted pdf with that format (means there is nothing between << and >>) please report.

ogun7 · 05-02-2009, 03:34 PM

You can download the scripts by searching for the adept drm on cabbages' site through Google, then hitting the cached link. That's how I did it. Now how about someone letting me know how I can strip DRM from Adobe Digital Editions I purchased on Mac OS X?

joblack · 05-02-2009, 04:23 PM

Quote:

Originally Posted by ogun7

You can download the scripts by searching for the adept drm on cabbages' site through Google, then hitting the cached link. That's how I did it. Now how about someone letting me know how I can strip DRM from Adobe Digital Editions I purchased on Mac OS X?

The inept_pdf script will probably work but the key retrieval script doesn't work because the Mac has no registry (I've heard it has something like an xml or configuration file structure).

Just adjust the key retrieval script and you're fine ...

ilovejedd · 05-02-2009, 05:07 PM

Quote:

Originally Posted by joblack

Very strange - I also have two people who have encrypted pdfs with an empty trailer ... check out your working encrypted pdfs with a hex editor. If there is a

trailer.<<>>.startref.$NUMBER.%%EOF

at the end and your Digital Editions is still showing it they have changed the format of the pdf again (Adobe also forced me to update my DE).

But without a trailer it goes against the official pdf reference (and shouldn't work)... anyway, if you have a working encrypted pdf with that format (means there is nothing between << and >>) please report.

Since you've mentioned it, I did some comparisons between some encrypted PDF files and ones that have been "freed" with ineptpdf. It's interesting to note that all PDF files were version 1.5. For the ones that were successfully decrypted, the original encrypted files had two sets of

trailer
<<$TEXT>>
startxref
$NUMBER
%%EOF

Those that failed (even if they were reported by ineptpdf to be successfully decrypted) contained three sets of "trailer" but the first set ends in

xref
0 0

instead of

%%EOF

It also contains a whole lot more bytes between trailer and xref. PM me your email address so I can send you the problematic files for studying.

joblack · 05-02-2009, 05:32 PM

Quote:

Originally Posted by ilovejedd

Since you've mentioned it, I did some comparisons between some encrypted PDF files and ones that have been "freed" with ineptpdf. It's interesting to note that all PDF files were version 1.5. For the ones that were successfully decrypted, the original encrypted files had two sets of

trailer
<<$TEXT>>
startxref
$NUMBER
%%EOF

Those that failed (even if they were reported by ineptpdf to be successfully decrypted) contained three sets of "trailer" but the first set ends in

xref
0 0

instead of

%%EOF

It also contains a whole lot more bytes between trailer and xref. PM me your email address so I can send you the problematic files for studying.

Important are the encrypted (non-freed) pdfs ... how are they?

ilovejedd · 05-02-2009, 06:04 PM

Quote:

Originally Posted by ilovejedd

For the ones that were successfully decrypted, the original encrypted files
<snip>

Quote:

Originally Posted by joblack

Important are the encrypted (non-freed) pdfs ... how are they?

The quoted behavior is for the encrypted files. It's the freed PDFs for the problematic files that contain the following:

trailer
<<>>
startxref
$NUMBER
%%EOF

Currently out of the house and the files are not on my laptop. Will email them to you when I get home.

tjax · 05-02-2009, 06:26 PM

I have only one pdf, which is decrypted incorrectly.

Quote:

Originally Posted by joblack

I'm investigating ... how big is your adeptkey.der exactly? 607 or 608 bytes?

It's 608 bytes.

I have 3 sets of "trailer" in the encrypted (original) file, the first one ends in:

xref
0 0

while the other 2 end in:

startxref
$NUMBER
%%EOF

It's exactly what ilovejedd mentioned here.

In the decrypted file (which doesn't work), there is only one "trailer" sequence that ends in:

startxref
$NUMBER
%%EOF

Sorry for answering so late, I wasn't used to the topic being so active

If you have any more questions I'll try to answer sooner.

joblack · 05-02-2009, 08:38 PM

.....

shankez · 05-02-2009, 10:37 PM

I don't know if it can be meaningful (may be not, I am not a programmer) but I have noticed that the working decrypted pdf files (I have two) changes only a little their size (6 or 8 bytes) after the decryption process, while the non-working decrypted one differs from the encrypted one for more than 100 bytes, from 1839 it goes to 1727 Kb. It seems that something get lost in the process. Thankd to all for the work..

Sydney's Mom · 05-02-2009, 11:09 PM

608 bytes, also.

Has anyone heard from ILC? I certainly hope he is okay. If he needs money for bail or a lawyer, I hope he lets us know.

joblack · 05-02-2009, 11:20 PM

Quote:

Originally Posted by shankez

I don't know if it can be meaningful (may be not, I am not a programmer) but I have noticed that the working decrypted pdf files (I have two) changes only a little their size (6 or 8 bytes) after the decryption process, while the non-working decrypted one differs from the encrypted one for more than 100 bytes, from 1839 it goes to 1727 Kb. It seems that something get lost in the process. Thankd to all for the work..

Obviously the parser doesn't work right, but that's what he had written earlier ...

ilovejedd · 05-02-2009, 11:37 PM

Actually, I think it was around 10KB difference with working PDFs and 30KB with non-working ones.

joblack · 05-03-2009, 12:11 AM

There's a new updated script floating around in the web which probably solves the problem (it did at least in my case). Unfortunately I'm not the author so of course I don't take credit for it ...

It can be found at the usual suspected websites ... nothing more to say about that

.

ilovejedd · 05-03-2009, 12:30 AM

Quote:

Originally Posted by joblack

There's a new updated script floating around in the web which probably solves the problem (it did at least in my case). Unfortunately I'm not the author so of course I don't take credit for it ...

It can be found at the usual suspected websites ... nothing more to say about that

.

Yep. anonymous was nice enough to send me the link to the updated script. Won't have time to test it until I get home, though.

05-02-2009, 08:38 PM	#264
joblack Wizard Posts: 1,752 Karma: 4382688 Join Date: Jul 2006 Location: Somewhere on earth Device: Onyx Boox Tab X C	..... Last edited by joblack; 05-02-2009 at 08:49 PM.

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05-01-2009, 11:28 PM	#256
ilovejedd hopeless n00b Posts: 5,110 Karma: 19597086 Join Date: Jan 2009 Location: in the middle of nowhere Device: PW4, PW3, Libra H2O, iPad 10.5, iPad 11, iPad 12.9	609 bytes here.

05-02-2009, 03:34 PM	#258
ogun7 Junior Member Posts: 1 Karma: 10 Join Date: Nov 2002 Location: Brooklyn, NY	You can download the scripts by searching for the adept drm on cabbages' site through Google, then hitting the cached link. That's how I did it. Now how about someone letting me know how I can strip DRM from Adobe Digital Editions I purchased on Mac OS X?

05-02-2009, 10:37 PM	#265
shankez Junior Member Posts: 7 Karma: 10 Join Date: Apr 2009 Device: kindle 2	I don't know if it can be meaningful (may be not, I am not a programmer) but I have noticed that the working decrypted pdf files (I have two) changes only a little their size (6 or 8 bytes) after the decryption process, while the non-working decrypted one differs from the encrypted one for more than 100 bytes, from 1839 it goes to 1727 Kb. It seems that something get lost in the process. Thankd to all for the work..

05-02-2009, 11:09 PM	#266
Sydney's Mom Wizard Posts: 2,899 Karma: 6995721 Join Date: Dec 2008 Location: Idaho, on the side of a mountain Device: Kindle Oasis, Fire 3d Gen and 5th Gen and Samsung Tab S	608 bytes, also. Has anyone heard from ILC? I certainly hope he is okay. If he needs money for bail or a lawyer, I hope he lets us know.

05-02-2009, 11:37 PM	#268
ilovejedd hopeless n00b Posts: 5,110 Karma: 19597086 Join Date: Jan 2009 Location: in the middle of nowhere Device: PW4, PW3, Libra H2O, iPad 10.5, iPad 11, iPad 12.9	Actually, I think it was around 10KB difference with working PDFs and 30KB with non-working ones.

05-03-2009, 12:11 AM	#269
joblack Wizard Posts: 1,752 Karma: 4382688 Join Date: Jul 2006 Location: Somewhere on earth Device: Onyx Boox Tab X C	There's a new updated script floating around in the web which probably solves the problem (it did at least in my case). Unfortunately I'm not the author so of course I don't take credit for it ... It can be found at the usual suspected websites ... nothing more to say about that .

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