eblib: Problem removing PDF DRM

eblib: Problem removing PDF DRM

 

Hi all
Is protection Differs??!!
I done removed protection easily form file like this
hxxp://www.isg-egypt.com/rl/uploads/Oxford_American_Mini-Handbook_of_Gastrointestina.pdf
but when I try to remove it from this pdf I failed
here is the link
hxxp://www.isg-egypt.com/rl/uploads/Handbook_of_Optometry_and_Eye_Disorders.pdf

here is image of the error


both are from eblib.com at the same time
I realized that all books from publisher jaypee have a problem in DRM removal ...I failed with every method
could you help in that ??

thank you

Re: eblib: Problem removing PDF DRM

 

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.

Re: eblib: Problem removing PDF DRM

 

thank you that was helpful