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2007-09-15 - By Seung Hyun Park

Back
Hello.

I have a question about the signing of PDF with iText.

I know that PDF encryption spec. provides the permission to allow signing
and adding annotations.

I can sign a PDF file using Acrobat without typing owner password if it has
the permission to allow signing.

But, iText always needed owner password to sign on the PDF files, although
they already had the signing permission, when I made some test codes and
tried them.

To be specific, PDFReader can read the PDF files encrypted without setting
owner password but error occurs at PdfStamper.CreateSignature method.

If I set owner password at the constructor of PDF reader, the error
disappears.

But, I have to insert signature without owner password at my scenario.

My test codes are based on the article ? "How to sign a PDF using iText and
iTextSharp" and work well with unencrypted PDF files.

How do I sign on the PDF files that they are encrypted but have signing
permission?

Strictly speaking, I want to know that it is possible to sign them with
iText.

I attach the sample PDF file that I have used for testing.

If you could take a few minutes to answer my questions, I would really
appreciate it.

Always thank you in advance for your help.

Best regards,

S. H. Park

Hello.
 
I have a question about
the signing of PDF with iText.

 
I know that PDF
encryption spec. provides the permission to allow signing and adding
annotations.

 
I can sign a PDF
file using Acrobat without typing owner password if it has the permission
to allow signing.

 
 
But, iText always needed
 owner password to sign on the PDF files, although they&nbsp
;already had the signing permission, when I made some test codes and tried
them.

 
To be specific,
PDFReader can read the PDF files encrypted without setting owner password but
error occurs at
PdfStamper.CreateSignature method.
 
If I set owner password
at the constructor of PDF reader, the error disappears.

 
But, I have to insert
signature without owner password at my scenario.

 
 
My test codes are based
on the article ? "How to sign a PDF using iText and iTextSharp" and
work well with unencrypted PDF files.

<div style="BACKGROUND: white; MARGIN: 0cm 0cm 0pt; TEXT-AUTOSPACE: ideograph
-numeric"> </div>
<div style="BACKGROUND: white; MARGIN: 0cm 0cm 0pt; TEXT-AUTOSPACE: ideograph
-numeric"> 
</div>
 

How do I sign on the PDF
files that they are encrypted but have signing permission?


 
Strictly
speaking, I want to know that it is possible to sign them with iText.

 
<div style="BACKGROUND: white; MARGIN: 0cm 0cm 0pt; TEXT-AUTOSPACE: ideograph
-numeric"> </div>
<div style="BACKGROUND: white; MARGIN: 0cm 0cm 0pt; TEXT-AUTOSPACE: ideograph
-numeric"> </div>
<div style="BACKGROUND: white; MARGIN: 0cm 0cm 0pt; TEXT-AUTOSPACE: ideograph
-numeric">I attach the sample PDF
file that I have used for testing. </div>
 

<div style="BACKGROUND: white; MARGIN: 0cm 0cm 0pt; TEXT-AUTOSPACE: ideograph
-numeric"> </div>
<div style="BACKGROUND: white; MARGIN: 0cm 0cm 0pt; TEXT-AUTOSPACE: ideograph
-numeric"> </div>
If you could take a few
minutes to answer my questions, I would really appreciate it.

Always thank you in
advance for your help. 

 Best regards,


S. H. Park

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