To use a digital certificate in Open Office 2.0, you must import it into firefox.
Then add
to ~/.bash_profile:
export MOZILLA_CERTIFICATE_FOLDER=/home/myname/.mozilla/firefox/blah234blah234blah.default
Now, when you run open office, you can choose the certificate with which to sign a document.
I wish someone had simply stated that 3 weeks ago.
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kwhiskers{