Opened 13 years ago

Closed 3 years ago

Last modified 13 months ago

#91 closed enhancement (fixed)

encrypted documents

Reported by: guest Owned by:
Priority: minor Milestone: 1.4.0
Component: Plugin: PDF Version: 1.0 Beta 3
Keywords: Cc:


is it possible to enhance the pdf part, so that encrypted documents could be read?

Change History (16)

comment:1 Changed 13 years ago by eros2

Of course, we will do that.

I don't have such documents, can you attach encrypted pdf document for testing?

comment:2 Changed 13 years ago by guest

where can i send the file? trac doesn't allow me to upload the file. the filesize is 3MB.

comment:3 Changed 13 years ago by eros2

send to, please.

comment:5 Changed 13 years ago by eros2

Thanks, which password to open it?

comment:6 Changed 13 years ago by guest

i don't know how it is done in acrobat. i do not need a password for it. it is a e-book which i purchased. and probably something got installed on the win pc while i was downloading the pdf

comment:7 Changed 13 years ago by eros2

When I told about encrypted documents support, I mean password-protected encrypted documents.

comment:8 Changed 13 years ago by guest

so this kind of documents will not be supported? i guess it's necessary, because more and more e-books will be around

comment:9 Changed 13 years ago by eros2

Lucide's PDF plugin uses poppler library ( for pdf rendering. So we can support only features which poppler supports.

Currently, I know nothing about Acrobat's way to decrypt your PDF and which keys it uses. I tried under Windows and just got error "Document is encrypted". We will investigate, and if poppler have support for such PDFs - we will support them.

comment:10 Changed 4 years ago by lewisr

I have been able to open Acrobat 8 & 9 password-protected documents for some time. Is this still an issue with 1.3.5?

comment:11 Changed 4 years ago by lewisr

Just today, I encountered a PDF encrypted with AES-256 (Acrobat X or SecurityHandler V6). I was unable to open this (neither could qPDFView, for that matter, as poppler - even the latest version as of this writing - cannot).


comment:12 Changed 4 years ago by lewisr

  • Milestone set to 2.0 and further

Related to #266

comment:13 Changed 4 years ago by lewisr

  • Owner eros2 deleted

comment:14 Changed 4 years ago by lewisr

  • Milestone changed from 2.0 and further to Future

Milestone renamed

comment:15 Changed 3 years ago by lewisr

  • Resolution set to fixed
  • Status changed from new to closed

The file attached to:

opens fine under 1.3.6 beta (not as an encrypted file). Further,

EOS_7D_Mark_II_AF_guide_CUSA_9-2014.pdf, linked from the second link in comment:11, but retrieved from, built as PDF 1.7, apparently using Adobe InDesign CC on Mac, with Adobe PDF Library 10.0.1, opens with no problem.

I can no longer locate the encrypted PDF which I referenced in comment:11, though I believe this has been addressed in the later poppler.

comment:16 Changed 13 months ago by gyoung

  • Milestone changed from Future to 1.4.0

Move closed tickets to completed milestone. Many of these were completed before 1.4.0

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