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PDF signing
There are free programs available to create digital signatures with certificates on PDF documents:
Libre Office
LibreOffice can sign PDF documents since version 4.5.
Portable Signer
GUI and commandline tool for Linux, OSX, and Windows
jPdfSign
A command-line application written in Java which allows to add an invisible signature to PDF documents
JSignPdf
A Java application which adds digital signatures to PDF documents. It can be used as a standalone application or as an Add-On in OpenOffice.org
website: http://jsignpdf.sourceforge.net/
- license: GNU LGPL
DigiSigner
A Java GUI application which lets you open PDF documents and add visible and invisible digital signatures to them. Supports smartcards. Available for Windows, Mac and Linux.
website: http://www.digisigner.com/
CAcert PDF Signer
Command-line tool only for Linux, OSX, and Windows
Nautilus Script for PdfSigner: http://svn.cacert.org/CAcert/Software/PdfSigner/pdfsigner-nautilus.sh
OpenSignPDF
Supports Smartcards and Timestamping
Footprint
PDF Writer and Signer
- Java 1.6+ library
PDFCreator
PDFCreator easily creates PDFs from any Windows program.Use it like a printer in Word, StarCalc or any other Windows application.
Misc
- Adobe´s documentation on PDF Security:
OpenOffice feature request with voting: