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The GNU General Public License or GPL is used by almost all GNU software, and more than half of all FreeSoftware. (currently the GPL v2 is the most widely used one)
It's a DFSG compatible license.
You can get a verbatim copy :
GPL-v2 or on your Debian system in /usr/share/common-licenses/GPL-2
The other DFSG Licenses.
http://www.gnu.org/licenses/licenses.html#GPL GNU's page about GPL Licenses
GPL (last modified 2011-03-27 00:30:53)