LICENSE.txt

The PlantStudio Botanical Illustration Software source code is:
Copyright 1993-2011 Cynthia F. Kurtz and Paul D. Fernhout

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The PlantStudio Botanical Illustration Software source code included here is hereby placed 
under the GNU GPL v3.0 or any later version. See: http://www.gnu.org/licenses/gpl.html

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 3 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, see <http://www.gnu.org/licenses/>.
    
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The "PlantStudio" name itself is a trademark of Cynthia F. Kurtz and Paul D. Fernhout.
Basically, similar to with the "Linux" trademork,
  http://www.linuxfoundation.org/programs/legal/trademark
if you make useful derivatives of the code under the GPL about 3D models of plants and similar things,
and true to the purpose of openness and sharing as we see it, and with proper attribution as to the origins
of the software, we will permit you to use the trademark. Otherwise we will request you to change
the name of the software you distribute to avoid confusion.