Additional software is needed to do the strong encryption, which is used, when you digitally sign PDF files. You will need to download, and install this into the existing java installation. The complete name of the software is called: ‘Java Cryptography Extension (JCE) Unlimited Strength Jurisdiction Policy Files’.
The software to download depends on which version of JRE you are running. If you are running JRE 7, then you can currently use this link:
http://www.oracle.com/technetwork/java/javase/downloads/index.html
Where it is found in the bottom. After downloading you should read the ‘README’ file for instruction of how to install, but it is actually just a question of copying two .jar files into the /lib/security directory where java is installed. This could be here:
C:\Program Files\Java\jre7\lib\security
Inside the ‘security’ directory you may find two existing files named the same as the files you want to copy. If you want to be sure you can e.g. rename the existing files - then you can always come back if something should go wrong.
If you are running JRE 6, you can currently download Java Cryptography Extension (JCE) via this link:
