Jammy, Jammy Chen wrote > Can I sign one PDF with two signatures? for example: first off you signed > this PDF, later on, I have to sign this same pdf with my signature again > so the file will have 2 signatures. Do you know is it possible? I don't > think it is possible, how I can this?
It is possible. In contrast to the parallel signatures known in other contexts, though, multiple signatures in the same PDF must be applied sequentially: the first one signs the unsigned original and the second one signs the unsigned original plus the first signatures. Cf. Bruno's white paper, section 2.5; he today has posted the URL where the current draft can be downloaded: http://itextpdf.com/book/digitalsignatures20120823.pdf Regards, Michael -- View this message in context: http://itext-general.2136553.n4.nabble.com/How-to-sign-one-PDF-with-two-signatures-tp4656081p4656083.html Sent from the iText - General mailing list archive at Nabble.com. ------------------------------------------------------------------------------ Live Security Virtual Conference Exclusive live event will cover all the ways today's security and threat landscape has changed and how IT managers can respond. Discussions will include endpoint security, mobile security and the latest in malware threats. http://www.accelacomm.com/jaw/sfrnl04242012/114/50122263/ _______________________________________________ iText-questions mailing list iText-questions@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/itext-questions iText(R) is a registered trademark of 1T3XT BVBA. Many questions posted to this list can (and will) be answered with a reference to the iText book: http://www.itextpdf.com/book/ Please check the keywords list before you ask for examples: http://itextpdf.com/themes/keywords.php
