adding graphic to illustrate the different software models

svn path=/trunk/; revision=24998

freesoftware/basics/comparison.en.xhtml

@@ -133,8 +133,24 @@
       Free Software definition and the Open Source definition. This means that
       neither the terms Open Source and Free Software nor the different
       definitions are suitable to distinguish between Copyleft and non-Copyleft
-      licenses. Both are sub-classes of Free Software licenses recognized by
-      the Open Source Initiative and the FSF.
+      licenses. 
+    </p>
+
+    <p>
+      <center>
+        <img src="freesoftware/basics/softwaremodels.png" alt="This graphic
+        should visualise the different software categories and their
+        connection" title="This graphic visualises the different software
+        categories and their connection"/>
+      </center>
+    </p>
+
+    <p>
+      Protecttive licenses and non-prtective licenses are sub-classes of Free
+      Software licenses recognized by the Open Source Initiative and the
+      FSF. Copyleft or non-Copyleft is not a criteria suitable to distinguish
+      between Open Source and Free Software, both terms describe the same set
+      of software.
     </p>
 
     <h2>Development model</h2>