The Free Vector GeoData Osnabrück (Frida) are
Copyright (C) by Intevation GmbH and licensed
under the GNU General Public License (see COPYING.GPL).

Additional license agreement:

The GNU GPL has been chosen because no analog license
for geographic data does yet exists.
If in the future the Free Software Foundation Europe
officially accepts a Geographic Data license as to be analog
to the GNU GPL, Frida may be upgraded to this new license.