Remove DRM from PDF ebooks (Adobe Digital Editions)

Originally Posted by samira1979

Hi everybody,

I purchased a pdf book yesterday. I did not know that I should get an ID for ADE. Then, I could open the file but I could not open the file on my other computer. Then, I got an ID. At the last stage, it warned me that all existing items would be non readable. But I ignore it and then I could not read my book even on my PC. I uninstalled the ADE and re-install but the problem did not solve. I could not download the PDF again.

Today, I saw this forum and I am using the following:
ADE 1.7.1
Python 2.6.4
Windows XP 32 bits
Ineptkey 5.0
Ineptpdf 7.4

but the error decrypting book session key appears.

What can I do?
Thank you for your help.

Try to find out how to re-download your PDF ebooks. There is nothing else I can suggest here.

[dramroo]

I have this error happens with only books from 1 publisher
other books are de DRMed nicely
here is image of the error


and here sample book from this publisher

http://www.isg-egypt.com/rl/uploads/Handbook_of_Optometry_and_Eye_Disorders.pdf

if you could help me I will be gratful
thanks

[any ANONYMOUS forum user]

Originally Posted by dramroo

I have this error happens with only books from 1 publisher
other books are de DRMed nicely

Can you open these PDF ebooks with Adobe Digital Editions?

[dramroo]

Originally Posted by any ANONYMOUS forum user

Can you open these PDF ebooks with Adobe Digital Editions?

Yes I can open it normally

[AAfan]

Hi,

I have seen that error before. That error is caused by a pdf "dict" object having an odd number of elements in it. According to the pdf spec, a "dict" should only ever have an even number of elements since they are sets of key/value pairs.

So that pdf from that publisher corrupted. ADE still opens it because it must be more robust to violations of the official pdf spec.

You should be able to edit that pdf by hand and change that specific dict element to have an even number of elements by finding the hopefully obvious non-pair (extra key or extra value) and removing it. From looking at your error it appears there is a /Keywords key that does not have any value associated with it. If you can edit that file and remove the /Keywords piece from that dict element, that should fix that error.

Or perhaps a pdf repair program might be able to help.

[dramroo]

Originally Posted by AAfan

Hi,

I have seen that error before. That error is caused by a pdf "dict" object having an odd number of elements in it. According to the pdf spec, a "dict" should only ever have an even number of elements since they are sets of key/value pairs.

So that pdf from that publisher corrupted. ADE still opens it because it must be more robust to violations of the official pdf spec.

You should be able to edit that pdf by hand and change that specific dict element to have an even number of elements by finding the hopefully obvious non-pair (extra key or extra value) and removing it. From looking at your error it appears there is a /Keywords key that does not have any value associated with it. If you can edit that file and remove the /Keywords piece from that dict element, that should fix that error.

Or perhaps a pdf repair program might be able to help.

Thanks for suggestions ...
How can I edit the PDF file and change it?? which software??

Update : Systtools PDF repair didn't solve the problem
Update 2: recovery toolbox fixed the file but bookmarks and cover was lost...
thanx

[AAfan]

Hi,

Make a copy of the bad drm'd pdf. Edit it with emacs (or any other good editor such as vim, jedit etc). Search for the line with '/Keywords' in the file. Look for something in that line that looks like '/Unknown'. Remove the substring '/Unknown' ***just from that line***. Save the file. Then try with the tools.

[lancelot]

Sorry for reviving an old thread but does anyone know if B&N's DRM PDF is based on Adobe's DRM?

I'm in a bind. I purchased a PDF ebook and it's only readable on my Nook tablet. So far, Nook for PC still doesn't allow downloading the same title to desktop. I like to be able to read this other devices. Please help a noob!

[any ANONYMOUS forum user]

Originally Posted by lancelot

Sorry for reviving an old thread but does anyone know if B&N's DRM PDF is based on Adobe's DRM?

I'm in a bind. I purchased a PDF ebook and it's only readable on my Nook tablet. So far, Nook for PC still doesn't allow downloading the same title to desktop. I like to be able to read this other devices. Please help a noob!

As i owned the book, i would have absolutely no bad feeling in torrenting the title in question.

[kenane]

HELLO,
I HAVE THIS ERROR MESSAGE WHEN TRYING TO REMOVE DRM

FOR THE 1st EBOOK



FOR THE 2nd



FOR THIS SOLUTION THERE NOTHING '/Unknown'

PLEASE HELP ME