Open-Source Distribution

ChemCell comes with no warranty of any kind. As each source file states in its header, it is a copyrighted code that is distributed free-of- charge, under the terms of the GNU Public License (GPL). This is often referred to as open-source distribution - see www.gnu.org or www.opensource.org. The legal text of the GPL is in the LICENSE file that is included in the ChemCell distribution.

Here is a summary of what the GPL means for ChemCell users:

(1) Anyone is free to use, modify, or extend ChemCell in any way they choose, including for commercial purposes.

(2) If you distribute a modified version of ChemCell, it must remain open-source, meaning you distribute it under the terms of the GPL. You should clearly annotate such a code as a derivative version of ChemCell.

(3) If you release any code that includes ChemCell source code, then it must also be open-sourced, meaning you distribute it under the terms of the GPL.

(4) If you give ChemCell files to someone else, the GPL LICENSE file and source file headers (including the copyright and GPL notices) should remain part of the code.

In the spirit of an open-source code, these are various ways you can contribute to making ChemCell better. You can send email to sjplimp at sandia.gov on any of these items.

• If you write/add a new feature to the code, let us know and we can include it in the general distribution.
• If you find a bug, report it.
• If you perform an interesting calculation with ChemCell or write a paper using ChemCell results, let us know and we can include a brief description, image, movie on the ChemCell WWW page.
• Send an email if you find an error or omission in the ChemCell documentation, or have a suggestion for something to clarify or include.
• Point prospective users to the ChemCell WWW Site or link to it from your WWW site.
• Cash. Small denominations, unmarked bills preferred. Leave in paper sack on desk. VISA also accepted. Chocolate chip cookies encouraged.