Hi JC, I do understand the concept of certification the way that it should hinder software to do further 'unallowed' changes. To track the changes that happened to a document later on and compare the different versions is a difficult task. There was a mail thread regarding version comparsion some weeks ago ...
Greetings Andreas ----- Original Message ---- From: Paulo Soares <[email protected]> To: Post all your questions about iText here <[email protected]> Sent: Thursday, July 2, 2009 12:29:26 PM Subject: Re: [iText-questions] Verify PDF certification validity using iText There's no documentation from Adobe on what is considered legal or not to add to a certified doc. iText doesn't do any verifying other than verifying the signature. Paulo > -----Original Message----- > From: JC Guerrero [mailto:[email protected]] > Sent: Thursday, July 02, 2009 8:50 AM > To: [email protected] > Subject: [iText-questions] Verify PDF certification validity > using iText > > Hello. > > First, sorry for my english... > > I'm using Java iText to certify PDF document and get control > of changes allowed in document. I want to only allow to > append new digital signatures over the certified document. > > The PDF certified with > sap.setCertificationLevel(PdfSignatureAppearance..CERTIFIED_FOR > M_FILLING) is verifiyng OK, either with iText and Adobe > Reader if only changes allowed are appended to the document. > > But i don't know how can i check if the certification > maintains his validity (with iText) when changes not allowed > have been added to the document certified. > > Is there any way to check the certification status with itext? > > Many thanks. > > JC Guerrero > Aviso Legal: Esta mensagem é destinada exclusivamente ao destinatário. Pode conter informação confidencial ou legalmente protegida. A incorrecta transmissão desta mensagem não significa a perca de confidencialidade. Se esta mensagem for recebida por engano, por favor envie-a de volta para o remetente e apague-a do seu sistema de imediato. É proibido a qualquer pessoa que não o destinatário de usar, revelar ou distribuir qualquer parte desta mensagem. Disclaimer: This message is destined exclusively to the intended receiver. It may contain confidential or legally protected information. The incorrect transmission of this message does not mean the loss of its confidentiality. If this message is received by mistake, please send it back to the sender and delete it from your system immediately.. It is forbidden to any person who is not the intended receiver to use, distribute or copy any part of this message. ------------------------------------------------------------------------------ _______________________________________________ iText-questions mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/itext-questions Buy the iText book: http://www.1t3xt.com/docs/book.php Check the site with examples before you ask questions: http://www.1t3xt.info/examples/ You can also search the keywords list: http://1t3xt.info/tutorials/keywords/
