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http://confluence.atlassian.com/display/DOC/Editing+the+Footer - explains how to modify the property files inside of a jar file.

Instead, I just keep it simple, edit ./confluence/decorators/includes/footer-content.vm and comment the first instance of,

$action.getText('licensefooter.community',[$action.getText('url.atlassian'), $action.getText('hitcounter.community'), $license.organisation])<br>

using #* text *#

#*$action.getText('licensefooter.community',[$action.getText('url.atlassian'), $action.getText('hitcounter.community'), $license.organisation])*#<br>

Just refresh your browser to see the change take effect.

I also found that commenting out the following gives more space,

    <!--ul id="poweredby">
        <li class="noprint">$action.getText('powered.by.atlassian.confluence',
            [$action.getText('url.atlassian.software.confluence.footer'),
            "<span id='footer-build-information'>$generalUtil.versionNumber</span>",
            $action.getText('url.enterprise.wiki.footer') ])</li>
        <li class="print-only">$action.getText('printed.by.atlassian.confluence',["$generalUtil.versionNumber"])</li>
        <li class="noprint"><a href="$action.getText('url.bug.feature.request')" class="hover-footer-link">$action.getText('bug.feature.request')</a></li>
        <li class="noprint"><a href="$action.getText('url.footer.atlassian.news')" class="hover-footer-link">$action.getText('footer.atlassian.news')</a></li>
    </ul-->