The upstream license for tomcat is the Apache License. The maintainer, however, has licenses his modifications under the GPL. However, according to http://www.gnu.org/licenses/license-list.html#GPLIncompatibleLicenses, the Apache license is not compatible with the GPL.
This means we can't distribute the tomcat deb, until such changes are relicensed. It also means that if the tomcat maintainer has accepted patches on behalf of tomcat, he needs to check with the original patch submitters, as the license of those patches is in question(are they under Apache, or GPL?).
