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JSignPdf is a Java-based application which adds digital signatures to PDF documents. It can be used as a standalone application or as an Add-On in OpenOffice.org.
This way, you will be able to protect your PDF files against unauthorized usage. Now all your PDF files can be protected.
Here are some key features of "JSignPdf":
· Several different keystore types (as provided by Java)
· Adding digital signatures to PDFs
· Setting certification level
· PDF encryption and setting rights
· Adding signature icon to PDF (visible signature)
· Comprehensive Swing GUI
Requirements:
· Java Runtime Envir onment (included in the installer)
What's New in This Release: [ read full changelog ]
· The new version fixes TSA authentication problems, when used from command line.

Via: JSignPdf 1.4.1