Hi,
thanks for your quick reply! Can you provide more information on how to do a
full save with iText after removing the signature field? What I do right now is:
InputStream signedFileStream = // FileInputStream for a temporary java.io.File
OutputStream resultFileStream = // FileOutputStream for a different temporary
File
PdfReader reader = new PdfReader(signedFileStream);
AcroFields acroFields = reader.getAcroFields();
acroFields.removeField("my_signature_name");
PdfStamper stamper = new PdfStamper(reader, resultFileStream);
stamper.close();
reader.close();
We want to use Acrobat Pro v8 to apply password protection to pdf files stored
in a document management system, and Acrobat displays a message that this is
impossible for signed/certified documents. That's why we tried to remove the
signature programmatically, but setting password protection still fails with
the same message.
Best regards,
Rico
_________________________________________________________
Rico Starke / Capgemini sd&m / Hamburg
Tel: +49 40 254491-451 / www.de.capgemini-sdm.com
Fax: +49 40 254491-11 / mailto:rico.sta...@capgemini-sdm.com
Capgemini sd&m AG, Lübecker Straße 128, 22087 Hamburg
Zusammen. Für nachhaltigen Erfolg.
_________________________________________________________
Vorstand: Edmund Küpper (Vorsitzender), Burkhard Kehrbusch, Rüdiger Azone,
Dr. Uwe Dumslaff, Kai Grambow, Dr. Michael Rading, Josef Ranner
Aufsichtsrat: Pierre Hessler (Vorsitzender)
Sitz und Amtsgericht: München HRB 126057
-----Ursprüngliche Nachricht-----
Von: Leonard Rosenthol [mailto:lrose...@adobe.com]
Gesendet: Donnerstag, 22. Januar 2009 13:15
An: Post all your questions about iText here
Betreff: Re: [iText-questions] Removing a signature thoroughly
(acroFields.removeField not sufficient?)
Why would you want to remove a signature? And do you have the rights to do so
(eg. Are you the signatory)?
After removing the field, be sure to do a FULL save on the PDF and not an
incremental one.
Leonard
On 1/22/09 12:29 PM, "Starke, Rico" <rico.sta...@gl-group.com> wrote:
Hi,
I have a problem removing a signature from a pdf file with iText. Can someone
help me?
I remove the signature with acroFields.removeField and write the document back
to disk using the pdfstamper. Now the signature is gone (acrobat says there are
no signatures in the newly written document), but I still cannot change the
security policy of the document.
What I want to do is to open File->Properties in Acrobat Pro v8, go to the
Security tab and choose "Password Protection" in the combobox. Yet, Acrobat
shows a message "the security policy cannot be changed because the document is
signed or certified", although there are no security restrictions applied to
the document (as displayed on the Security of the properties dialog), and
although all signatures have been removed.
Note: I'm using the German version of Acrobat, so some of my translations given
above may not match the english version exactly.
Any ideas how to remove this remainder of the signature with itext? I can
provide more code snippets, acrobat screenshots or example pdf files if that
helps.
Kind regards,
Rico Starke
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