The soil data used by this software are derived from the soil database from FAO

Below is reproduced the copyright from the Harmonized World Soil Database :


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© 2008-2012 COPYRIGHT FAO, IIASA, ISRIC, ISSCAS, JRC
All rights reserved. No part of this Harmonized World Soil Database may be 
reproduced, stored in a retrieval system or transmitted by any means for resale
or other commercial purposes without written permission of the copyright
holders. Reproduction and dissemination of material in this information
product for educational or other non-commercial purposes are authorized 
without any prior written permission from the copyright holders provided the 
source is fully acknowledged. Full acknowledgement and referencing of all 
sources must be included in any documentation using any of the material 
contained in the Harmonized World Soil Database, as follows:
FAO/IIASA/ISRIC/ISS-CAS/JRC, 2012. Harmonized World Soil Database (version 1.2). FAO, Rome, Italy and IIASA, Laxenburg, Austria.


The most recent updates of the HWSD can be found at the HWSD Website:
http://webarchive.iiasa.ac.at/Research/LUC/External-World-soil-database/HTML/index.html?sb=1