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JSignPdf is 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. JSignPdf is open-source software and can be freely used in both private and business sectors.

Features:

Current version provides:

visible signatures - image and/or description located visualy in a PDF file (page and position can be specified)
several different keystore types (as provided by Java)
timestamps from authority in signature (TSA)
certificate validation through CRL and/or OCSP
setting certification level
setting hash algorithm
PDF encryption and setting rights
comprehensive Swing GUI
support for batch processing (controlled by command line arguments, without GUI)