Re: PDF forms not creating proper children

[Adam Reviczky <reviczky@gmail.com>]

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Not sure how good it is, but in the poppler discussion this site was
mentioned to verify the signature details: https://validator.docusign.com/

I have tried using with poppler's pdfsig and Okular.

Adam

On Tue, Jun 8, 2021 at 10:14 PM Leonard Janis Robert König <ljrk@ljrk.org>
wrote:

> On Tue, 2021-06-08 at 17:41 +0200, Pablo Rodriguez wrote:
> > On 6/7/21 10:43 PM, Leonard Janis Robert König wrote:
> > > Hi Adam, Hi Pablo,
> > >
> > > I just noticed your replies, sorry for the late answer!
> > >
> > > I could sign forms with both okular as well as mupdf just fine,
> > > although the behavior is different.  The former assumes that the
> > > field
> > > is already an existing signature and segfaults when you look at the
> > > properties, but cann successfully add another signature using the
> > > "Tools" menu.
> >
>
> Hi Pablo,
>
> > I’m afraid that I don’t use Okular.
> >
> > >  With the latter you can click on the form field to
> > > trigger a menu to select the signature you want to sign with, and
> > > it
> > > "replaces" the "empty" signature generated by ConTeXt.  Both work
> > > fine,
> > > even with my newer ConTeXt.
> >
> > mupdf-gl signs the document, but in a way that only mupdf-gl
> > understands it.
> >
> > Try to open a PDF document signed with mupdf-gl in Acrobat (Reader or
> > not). You will see that the signature is wrong.
>
> Hm, I tested with Okular, Firefox and MasterPDF as I don't have Acrobat
> on Linux, and both understand the signature, which is why I thought
> it'd be correct.
>
> >
> > > > On Sun, May 2, 2021 at 5:50 PM Pablo Rodriguez <oinos@gmx.es>
> > > > wrote:
> > > > > [...]
> > > > > From my experience, only Acrobat deals with child objects in
> > > > > signatures
> > > > > generating a valid signature (and rewriting the two objects
> > > > > into a
> > > > > single one).
> > >
> > > As mentioned above, it seems that mupdf (now?) actually rewrites
> > > "both"
> > > signatures into one, however Okular doesn't.
> >
> > Sorry, objects is a very special term in PDF parlance. It has nothing
> > to
> > do with signatures.
> >
> > Just in case it might help,
>
> Ah, I see.  I'm still a bit unsure what to make of the "fields nested
> in TABLEs" issue, but maybe further debugging will show at some point.
>
> ~ Leo
>
>
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