This is not really a GSRC issue, but it involves
certificates, and this is a good place for that sort
of info.
<p>
The Ptolemy project has a Java code signing certificate,
for more information, see 
<a href="http://chess.eecs.berkeley.edu/ptolemy/sysadmin/certificates.htm">The Ptolemy Sysadmin Certificates page</a>
</p>