faisal, faisal wrote > But Adobe Acrobat allow to add watermark/annotation in this signed pdf and > after adding signature remains valid. can you guide me that how I can add > an Image in a signed pdf, either using watermark technique or annotation > and signature remain valid like Adobe Acrobat.
Depending on the allowed changes selected by the signer, Annotation creation is allowed. Watermarks (by adding of images to the content stream like you tried) are never allowed. Maybe, though, Adobe Acrobat uses annotations in some creative way to create watermarks. You might want to use Adobe Acrobat to create such a watermark annotation, analyze the PDF generated, and emulate that process in iText. Subsection "Adding annotations to an existing PDF" in section 7.3.1 of iText in Action, 2nd edition, and the sample TimeTableAnnotations1.java show how to add annotations to existing PDFs. Regards, Michael -- View this message in context: http://itext-general.2136553.n4.nabble.com/Digital-Signature-Corrupted-after-adding-watermark-image-tp4657457p4657462.html Sent from the iText - General mailing list archive at Nabble.com. ------------------------------------------------------------------------------ Master Visual Studio, SharePoint, SQL, ASP.NET, C# 2012, HTML5, CSS, MVC, Windows 8 Apps, JavaScript and much more. Keep your skills current with LearnDevNow - 3,200 step-by-step video tutorials by Microsoft MVPs and experts. ON SALE this month only -- learn more at: http://p.sf.net/sfu/learnnow-d2d _______________________________________________ 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
