On 3/10/2016 11:04 AM, Andreas Schneider wrote:
Hello Hans,
after comparing eforms and the result of a document edited by Acrobat,
the relevant portions in the spec (PDF 32000-1:2008) are:
Section 12.7.4.5, with tables 232 and 233.
From what I see it should be possible to add a field /FT /Sig with and
without a /Lock dictionary.
The /Lock dictionary created by Acrobat also specifies the optional
/Type /SigFieldLock (eforms doesn't, but when in doubt, I trust Adobe
more than eforms ;-))
Here is an example from the PDF stream of a document manually forged
with Acrobat:
%% Object stream: object 167, index 37; original object ID: 475
<<
/AP <<
/N 188 0 R
>>
/DA (/Helv 0 Tf 0 g)
/F 4
/FT /Sig
/Lock 187 0 R
/MK <<
>>
/P 196 0 R
/Rect [
253.965
163.306
525.056
186.143
]
/Subtype /Widget
/T (Gehnehmiger Unterschrift)
/Type /Annot
%% Object stream: object 187, index 57; original object ID: 495
<<
/Action /Exclude
/Fields [
(Einrichter Name)
(Einrichters Unterschrift)
]
/Type /SigFieldLock
("Einrichter Name" is another Text Field --> /FT /Tx [...] /Subtype
/Widget [...] /T (Einrichter Name)
"Einrichters Unterschrift" is another Signature Field)
next beta:
\setupinteraction[state=start]
\starttext
\definefield[x][signature]
\field[x]
\stoptext
Am 2016-03-09 16:16, schrieb Hans Hagen:
On 3/9/2016 2:11 PM, Andreas Schneider wrote:
Hello all,
is there currently any mechanism in ConTeXt similar to the LaTeX digsig
or eforms package?
I want to add a form field that can be digitally signed (which is now
already possible with Acrobat Reader, not just with Acrobat Pro).
Additionally (like the mentioned eforms package) it would be nice, if
you could specify other form fields that should be locked once the
signature field is actually signed (according to the PDF spec this is
simply set via a dictionary).
it's probably something trivial to implement so what are the relevant
fields (paragraphs/tables/dics/fields in the pdf spec) .. i'm not
going to reverse engineer some package but start from the spec
Anyway: can this currently be achieved with ConTeXt? If not: is there
any chance to get that feature added sometime? :-)
so far i never bothered with anything signature (i must say that i
never ran into such docs and it would not make them more valid to me
anyway)
Hans
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Hans Hagen | PRAGMA ADE
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Hans Hagen | PRAGMA ADE
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tel: 038 477 53 69 | www.pragma-ade.com | www.pragma-pod.nl
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___________________________________________________________________________________
If your question is of interest to others as well, please add an entry to the
Wiki!
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archive : http://foundry.supelec.fr/projects/contextrev/
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