Updating jar file
I couldn't see how to do this so have resorted to using an ant jar task (with update = true).
This page describes variations of the dialog for Java applications with a certificate from a trusted authority.
Tampering with the applets results in those applets becoming non-functional.
These certificates are required to be renewed every three years in order to keep them current.
The notice in the dialog is presented because the publisher has not set permissions attribute in the JAR file.
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