Re: [iText-questions] [signature] - Acrobat Reader 7.0 complains about modification of a signed PDF

[Siegfried Goeschl]

Hi Paulo, thanks for your quick reply for a first-time mailer .... :-) ... see the comments below ... Thanks in advance Siegfried Goeschl Paulo Soares wrote: ----- Original Message ----- From: "Siegfried Goeschl" <[EMAIL PROTECTED]> To: <itext-questions@lists.sourceforge.net> Sent: Thursday, March 24, 2005 3:40 PM Subject: [iText-questions] [signature] - Acrobat Reader 7.0 complains about modification of a signed PDF Hi folks, I signed a PDF document using itext-paulo-153 and JDK 1.4.2. Acrobat Reader 7.0 complains that the signature is okay but the document has changed (3 misc changes) ... this is the same problem that Joachim Kerschbaumer had in February (hello, by the way). +) Paulo meant this has something to do with the certificate so I tested it with two different certificates to no avail - I agree that the A-CERT certificate is touchy so I used a webtrust.de certificate as well The problem was with the german version of Acrobat Reader 7. The icon didn't match the text. The english version was ok. Correct  - the german text is really broken but even the English version of Acrobat Reader 7.0 states that there were miscellanous changes not affecting the signature. Check out  Validate Signature/Signature Properties Button/Document Tab/Compute Modification List Button: +) I get 1 miscellanous change for the visible signature for my signed PDF +) I get 3 miscellanous change for the invisible signature for my signed PDF +) Using the same certificate with Acrobat 6.0/7.0 does not report any changes So the signature is valid but the changes to a read-only document are confusing .... :-( +) I signed the same PDF manually with Acrobat Writer 6.0 and 7.0 and this problem does not appear You may not be signing the same way as iText. Well, I used the same certificate and signed the whole document +) Not being lazy I tested it with the german and english version of Acrobat Reader but this doesn't make any difference It did in the case of Joachim. +) Quite interestingly the number of changes are depending on the usage of visible/invisible signature. I assumed that the Acrobat Reader 7.0 might tinker around depending on the PDF version so I enforced writing out PDF 1.5 +) This problem does not appear when using Acrobat Reader 6.0 - so this problem might be introduced with PDF 1.6 and Acrobat 7.0?! Show us the pdfs and the steps you took to sign them. I send you the PDFs and the source code directly to you to avoid flooding the mailing list Has anyone an idea what's going on?! Thanks in advance Siegfied Goeschl ------------------------------------------------------- This SF.net email is sponsored by Microsoft Mobile & Embedded DevCon 2005 Attend MEDC 2005 May 9-12 in Vegas. Learn more about the latest Windows Embedded(r) & Windows Mobile(tm) platforms, applications & content. Register by 3/29 & save $300 http://ads.osdn.com/?ad_id=6883&alloc_id=15149&op=click _______________________________________________ iText-questions mailing list iText-questions@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/itext-questions