Bug 10010

Summary:	Unsupported version/revision (4/4) of Standard security handler
Product:	poppler	Reporter:	Andrew Sayman <lorien420>
Component:	general	Assignee:	poppler-bugs <poppler-bugs>
Status:	RESOLVED INVALID	QA Contact:
Severity:	normal
Priority:	medium	CC:	bradh
Version:	unspecified
Hardware:	x86 (IA32)
OS:	All
URL:	http://dev.owbn.org/files/uplink/OWBN_Status_Packet_2007.pdf
Whiteboard:
i915 platform:		i915 features:

Description Andrew Sayman 2007-02-17 13:23:22 UTC

This bug relates to the above linked document. I have tested with a few different applications that use poppler-0.5.4 as their back-end. Each of them opens with the same error for this document:

Error: Unsupported version/revision (4/4) of Standard security handler
Error: Incorrect password

This means I cannot view the document, but I know that this particular document should not require a password at all.

Comment 1 Brad Hards 2007-10-26 21:59:06 UTC

Hmm works for me in kpdf 0.5.7 (KDE 3.5.7).

I do see this in the file though: obj<</Length 128/CF<</StdCF<</Length 16/AuthEvent/DocOpen/CFM/AESV2>>>>/Filter/Standard/...

Comment 2 Brad Hards 2007-10-27 00:41:34 UTC

With HEAD (or whatever it is called in git), I see
Error (72978): Unknown filter 'Crypt'
(which is coming from Stream.cc)

Looks like an unimplemented PDF 1.5 feature.

When I look at this document, it looks like the filter is supposed to be on the XMP meta-data, but it looks unencrypted to me.

Comment 3 Albert Astals Cid 2007-10-27 03:06:03 UTC

Interesting we get the error but still the document is opened :-S

Comment 4 Brad Hards 2007-10-27 04:08:27 UTC

I'm still trying to understand what PDF spec section 3.5.4 is trying to explain, but this seems relevant:
323 0 obj
<</Length 128/
    CF<</StdCF
        <<
           /Length 16/
           AuthEvent/DocOpen/
           CFM/AESV2
        >>
      >>
    /Filter/Standard
    /...
    /V 4
    /EncryptMetadata false
    /StrF/StdCF
    /StmF/StdCF
>>

Note: I've reformatted it.

The EncryptMetadata false part basically means that all the encryption stuff is basically pointless. Only the metadata stream has the Crypt filter, and the crypt filter doesn't apply to the metadata...

Comment 5 Albert Astals Cid 2012-12-15 16:08:57 UTC

The URL seems to be gone so i'm closing the document, if you still have it around please attach it to the bug or upload it to somewhere else if it still fails.

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