![]() ![]() Details are found in a post by TU Dresden, who has sponsored the implementation of this feature. Good news! KDE's PDF viewer Okular (with backend Poppler) now supports embedded digital signatures in PDFs, similar to how Adobe Reader does it. ![]() jPDFSecure (commercial) – updated in 2017 but it is a Java library not a user tool.OpenSignature hasn't been updated since 2008.CACert's PdfSigner uses outdated iText tool. ![]() jPdfSign hasn't been updated since 2006.jSignPdf hasn't been updated since 2013.Portable Signer hasn't been updated since 2014 - this is the most well maintained among all.Portable Signer is the most well maintained of all. Unfortunately, none of the tools is currently maintained and none can be found in Ubuntu packages. The total list of opensource tools available for your purpose is: You might then expect Ubuntu PDF manipulation tools like qpdf, which provides encryption, or pdftk, which provides watermarking, to provide signing features too, but, no, they don't. You might expect Ubuntu document signing tools like qdigidoc or gpg would do, but no, they don't play with PDF signatures. It requires a private key in a p12 file though (not compatible with SmartCard).
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