SPDX-License-Identifier: GPL-2.0-or-later

This submission is licensed under the GNU General Public License v2.0 or later.

Full license text: https://www.gnu.org/licenses/old-licenses/gpl-2.0.txt

(Prototype note: real submissions to the NengoZoo MUST include the full
text of the GPLv2 license inline in this file. Kept brief here for readability.)
