http://benji3up2kxewkqfcq7buxk2xd6zwy3zggnurkrm3l4cvwy2iipvyyad.onion/mirrors/gmpdoc/Copying.html
More precisely, the GNU MP library is dual licensed, under the conditions of
the GNU Lesser General Public License version 3 (see COPYING.LESSERv3 ), or the GNU General Public License version 2 (see COPYINGv2 ). This is the recipient’s choice, and the recipient also has
the additional option of applying later versions of these licenses.