RMS never included copyleft in the requirements of the free software definition. <https://www.gnu.org/licenses/license-list.html https://www.gnu.org/licenses/l

RMS never included copyleft in the requirements of the free software definition. <https://www.gnu.org/licenses/license-list.html https://www.gnu.org/licenses/license-list.html> lists many non-copyleft licenses as legitimate free-software licenses.