Re: KPDF asks for password on some PDFs

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Dr. Nikolaus Klepp via tde-users wrote:

> Hi Stefan!
> 
> Anno domini 2024 Sat, 30 Nov 12:18:58 +0100
>  Stefan Krusche via tde-users scripsit:
>> Good day everyone,
>> 
>> just to add to what has been said, to modify the PDF file to make it
>> readable by kpdf, see below…
>> 
>> Am Sonntag, 25. August 2024 schrieb E. Liddell via tde-users:
>> > 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
>> 
>> $ pdfinfo ch32v003rm.pdf
>> Title:           CH32V003RM-EN
>> Author:          WCH
>> Creator:         pdfFactory Pro pdffactorychina.cn
>> Producer:        pdfFactory Pro 8.31 (Windows 11
>> CreationDate:    Mon Mar 11 12:25:23 2024 CET
>> 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
>> 
>> # change the password with a 40 bit one
>> $ qpdf --allow-weak-crypto --encrypt '' '' 40 -- ch32v003rm.pdf
>> ch32v003rm.new.pdf
>> 
>> $ pdfinfo ch32v003rm.new.pdf
>> Title:           CH32V003RM-EN
>> Author:          WCH
>> Creator:         pdfFactory Pro pdffactorychina.cn
>> Producer:        pdfFactory Pro 8.31 (Windows 11
>> CreationDate:    Mon Mar 11 12:25:23 2024 CET
>> 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:yes addNotes:yes
>> algorithm:RC4)
>> Page size:       595.32 x 841.92 pts (A4)
>> Page rot:        0
>> File size:       2288192 bytes
>> Optimized:       no
>> PDF version:     1.7
>> 
>> Now kpdf is able to open and show the file. See also:
>>
https://mirror.git.trinitydesktop.org/gitea/TDE/tdegraphics/issues/29#issue-1614
>> 
>> HTH
>> Stefan
> 
> So this lead me to a viable solution to automatically remove those pesky
> passwords:
> 
> - Place the attached programm in your path
> - make it executeable
> 
> In /opt/trinity/share/applications/tde/kpdf.desktop, change the "Exec=" to
> this:
> 
> Exec=decrypt-pdf %U; kpdf %U %i -caption "%c"
> 
> ... Now when KPDF opens a file it will first be sanitized (if possible)
> and then kpdf opens the unlocked file. Not as clean as I would like it to
> be, but good enough for me :)
> 
> Nik
> 

Why don't you add this to TGW, it could be implemented at some point of time

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