Re: KPDF asks for password on some PDFs

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Anno domini 2024 Sun, 25 Aug 12:27:44 -0400
 E. Liddell via tde-users scripsit:
> On Sun, 25 Aug 2024 12:32:04 +0200
> "Dr. Nikolaus Klepp via tde-users" <users@xxxxxxxxxxxxxxxxxx> wrote:
>
> > Hi all!
> >
> > I just found that KPDF is (again) asking for a password on non-password-protected PDFs and fails to open the PDF if no password is given. The PDF preview in konqueror is fine. I have attached a PDF that triggers the behaviour on my system (KPDF 14.2.0~pre65-0debian13.0.0+3~a).
> >
> > Could somebody please verify?
>
> The file is encrypted, which would explain the password:
>
> $ pdfinfo ch32v003rm.pdf
> Title:           CH32V003RM-EN
> Author:          WCH
> Creator:         pdfFactory Pro pdffactorychina.cn
> Producer:        pdfFactory Pro 8.31 (Windows 11
> CreationDate:    Mon Mar 11 07:25:23 2024 EDT
> Custom Metadata: no
> Metadata Stream: no
> Tagged:          no
> UserProperties:  no
> Suspects:        no
> Form:            none
> JavaScript:      no
> Pages:           185
> Encrypted:       yes (print:yes copy:yes change:no addNotes:yes algorithm:AES-256)
> Page size:       595.32 x 841.92 pts (A4)
> Page rot:        0
> File size:       2283093 bytes
> Optimized:       no
> PDF version:     1.7
>
> How it ended up that way, I couldn't say.  The "Producer:" line
> suggests that this is not being done on your system, so if it didn't
> start out encrypted, it's being tampered with in transit somewhere.
> Doesn't look like a kpdf issue, anyway.

Well, xpdf has no problem opening the file without password, nor has firefox, so it's either a kpdf or better a libpoppler issue. pdfinfo uses libpoppler, too, so that says it's a libpoppler problem.

The same thing happened some years ago and was somehow solved. This is most likely a regression.

Nik

>
> E. Liddell
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