A copy of the GNU General Public License v3 can be found in
/usr/share/common-licenses/GPL-3.
+
+
+The tests/ directory contains a complete copy of the source code for
+the pari-extra 3-1 package. This is a dummy package containing only
+Debian metadata, by Bill Alombert, with a licence statement saying
+it's GPL (implicitly GPLv3 compatible).