where did you find that? it is with a high chance way outdated information since the amazing icon designer
Andrzej Ambroz has changed the licence to ‘GPL 2 or later too’.
You can redistribute the Work and/or modify it - as well as bitmaps generated out of the Vector Source - under the terms of the GNU General Public License as published by the Free Software Foundation;
either version 2 of the License, or (at your option) any later version.
This particular copyright information and the GPL-license.txt
must accompany all copies of the Work along with a list of changes You made.
If You did not recieve a copy of the GNU General Public License
along with the Work, write to the Free Software Foundation,
Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
The Original Work is Copyright © 2012, Andrzej Ambro¿
All rights reserved.
OTWARTA PRACOWNIA PROJEKTOWA architekt Andrzej Ambro¿
town of Wolsztyn
more informations + download link to the full licence here;
and here some additional informations;