I need help - I can help - Encryption PDF 1.5

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Encryption PDF 1.5

Printed From: Debenu Quick PDF Library - PDF SDK Community Forum
Category: For Users of the Library
Forum Name: I need help - I can help
Forum Description: Problems and solutions while programming with the Debenu Quick PDF Library and Debenu PDF Viewer SDK
URL: http://www.quickpdf.org/forum/forum_posts.asp?TID=593
Printed Date: 18 May 24 at 8:17PM
Software Version: Web Wiz Forums 11.01 - http://www.webwizforums.com

Topic: Encryption PDF 1.5

Posted By: Ingo
Subject: Encryption PDF 1.5
Date Posted: 02 Jan 07 at 4:53AM

Hello!

I've problems to decrypt pdf-docs encrypted with Acrobat 7/8.
QuickPDF shows me with older pdf-docs 40- or 128-bit-encryption ... working with the new (7/8) pdf-docs the library shows nothing readable.

Is here someone with a hint or idea for me?
Thanks in advance and ...

Best regards and a Happy 2007,
Ingo

Replies:

Posted By: marian_pascalau
Date Posted: 02 Jan 07 at 5:44AM

Ingo, some months ago I have tested some PDF documents encrypted with Acrobat 7. The problem was that QuickPDF library does not properly read the Acrobat 7 (PDF spec 1.6) metadata fields used for encryption.

If this is your case someone must invest some time studying the documentation :-(

Posted By: Ingo
Date Posted: 09 Jan 07 at 5:07PM

Hi!

I think the problem is the new (1.6) encryption standard AES.
Before 1.6-specs the encryption standard RC4 was used. Actually QuickPDF can't work properly with AES-files. Are there some hints... some ideas? I don't want to read the whole 1200 pages ;-)

Best regards,
Ingo