attempt at itemizing our licensing terms and licenses in use by various files and...

git-svn-id: http://svn.osgeo.org/postgis/trunk@7052 b70326c6-7e19-0410-871a-916f4a2858ee

diff --git a/LICENSE.TXT b/LICENSE.TXT
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+PostGIS Licensing
+==================
+
+This file attempts to include all licenses that apply within the PostGIS
+source tree, in particular any that are supposed to be exposed to the end user
+for credit requirements for instance. 
+
+PostGIS General
+----------------
+
+In general PostGIS is licensed under GPL Version 2 terms except on files
+where expressly stated otherwise.  Please refer to the COPYING file for licensing details.
+
+PostGIS has dependencies on other libraries which are not under GPL and that are commonly ditributed with PostGIS core libraries.
+In general these are dynamically linked libraries. 
+Libraries are as follows:
+
+Proj4 - http://proj.osgeo.org -- X/MIT License
+GEOS - http://geos.osgeo.org -- LGPL License
+LibXML - http://xmlsoft.org/ -- X/MIT License
+GDAL - http://gdal.osgeo.org/ -- X/MIT Style License
+
+-- Source files included with PostGIS not under GPL
+-- The following loader/dumper files are derivative works or direct ports of ShapeLib which is under an X/MIT License
+loader/dbfopen,safileio.*, shapefil.h, shpopen.c
+
+-- These are under AT&T public domain (someone should probably verify)
+loader/getopt.*
+
+-- Doc/xsl files
+These are under a BSD Style license
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