Encryption PDF 1.5

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   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

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Ingo Members Profile Find Members Posts Moderator Group Joined: 29 Oct 05 Status: Offline Points: 3524	Post Options Post Reply Quote Ingo Report Post Thanks(0) Quote Reply Topic: Encryption PDF 1.5 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

marian_pascalau Members Profile Find Members Posts Debenu Quick PDF Library Expert Joined: 28 Mar 06 Location: Germany Status: Offline Points: 278	Post Options Post Reply Quote marian_pascalau Report Post Thanks(0) Quote Reply 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 :-(

Ingo Members Profile Find Members Posts Moderator Group Joined: 29 Oct 05 Status: Offline Points: 3524	Post Options Post Reply Quote Ingo Report Post Thanks(0) Quote Reply 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 Edited by Ingo - 10 Jan 07 at 1:53AM