Your rights and obligations
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Most of PSPP is distributed under the GNU General Public License.  The General Public License says, in effect, that you may modify and distribute PSPP as you like, as long as you grant the same rights to others.  It also states that you must provide source code when you distribute PSPP, or, if you obtained PSPP source code from an anonymous ftp site, give out the name of that site.

The General Public License is given in full in the source distribution as file COPYING.  In Debian GNU/Linux, this file is also available as file /usr/share/common-licenses/GPL-2.

To quote the GPL itself:

     This program is free software; you can redistribute it and/or modify it 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 program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.

     You should have received a copy of the GNU General Public License along with this program; if not, write to the Free Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA