ploticus 2.42 data display utility. Copyright 1998-2013 Stephen C. Grubb
The home page for PLOTICUS is http://ploticus.sourceforge.net
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.
GNU General Public License
A copy of the GNU General Public License should be present with the code, in
file GPL.txt. A copy of the GNU General Public License may also be obtained
from: Free Software Foundation, Inc., 51 Franklin St - Fifth Floor,
Boston, MA 02110-1301, USA.
Ploticus includes the following code written elsewhere:
GD library 1.3 and 1.6.3 by Thomas Boutell
Output modules for SVG and SWF by Bill Traill
Patch and smaller items are acknowledged directly in the source code or docs.
Clarifications: (my own opinions)
• Please contact me if you have questions or permission requests (see above).
• Can I make modifications to ploticus code?
Yes, but any derivatives must also be made freely available as GPL code, and
you must keep the GPL.txt and Copyright files intact with the source code.
The original authorship and provenance must not be hidden.
• Can ploticus be included/distributed as part of a non-GPL product?
You're prohibited from selling a non-GPL product that includes ploticus GPL code
as an integral part. However it's probably ok for a non-GPL product to invoke the
pl(1) command and give the end user the option to install ploticus for themselves.
The GPL addresses this issue here.
• How should ploticus be cited if it was used in the production of a published work?
Citation is always appreciated. Language like this is suggested:
Graphical data displays were produced using Ploticus software (ploticus.sf.net).