JSignPdf

JSignPdf is a Java application that is used to digitally sign PDF documents. It can be run standalone or as an extension to the excellent OpenOffice.org office suite. JSignPdf is open-source software and can be used legally and for free in both private and commercial spheres.

Features
Current version

• Allows you to add a digital signature to PDF documents
• supports various types of keystores (including the native Windows keystore when using Java 6)
• allows you to set the certification level
• supports reading and writing of encrypted PDF documents, including setting rights for a secure document
• can insert a visible signature into the PDF (visible signature) at the selected page and position - it is possible to use the PDF preview and select the location of the signature with the mouse
• supports time stamps - TSA (e.g. PostSignum or I.CA)
• allows inserting certificate invalidation information using CRL and OCSP
• offers two modes of operation - simple and for more advanced users
• is easy to use via Swing GUI
• supports batch processing (without GUI, controlled by command line arguments)