diff --git a/lang/en/docs/licence.html b/lang/en/docs/licence.html
index a29ee56c1e1..77344b1b684 100644
--- a/lang/en/docs/licence.html
+++ b/lang/en/docs/licence.html
@@ -19,12 +19,17 @@
   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the<BR>
   GNU General Public License for more details (attached below).<BR>
 </P>
-<P>There is one additional clause: <I>All installed and redistributed <BR>
-copies of Moodle must retain the "Made with Moodle" logo <BR>
-(or a visible equivalent) on the home page that links to moodle.com.</I><BR>
-If you wish to remove the logo, re-brand Moodle, or redistribute <BR>
-modifed copies of Moodle then please contact martin@dougiamas.com <BR>
-to negotiate terms and pricing.</P>
+<P>Redistribution of modified copies of Moodle must be distributed <BR>
+  as pristine base sources plus patches, so that 'unofficial' changes<BR>
+  can be readily distinguished from the base source.</P>
+
+<P>There is one additional clause:</P>
+
+<P>All installed copies of Moodle on Internet web sites must retain the <BR>
+  "Made with Moodle" logo (or a visible equivalent) on the home page <BR>
+  as a link to moodle.com. If you wish to remove the logo or re-brand <BR>
+  this software as part of a commercial enterprise then please contact <BR>
+  martin@dougiamas.com to negotiate terms and pricing.</P>
 
 <HR WIDTH="100%" SIZE="2"><BR>
    
diff --git a/lang/en/moodle.php b/lang/en/moodle.php
index 5292a4d41c9..560a90c003c 100644
--- a/lang/en/moodle.php
+++ b/lang/en/moodle.php
@@ -209,12 +209,17 @@ GNU General Public License for more details:
 
 http://www.gnu.org/copyleft/gpl.html
 
-There is one additional clause: All installed and redistributed 
-copies of Moodle must retain the \"Made with Moodle\" logo 
-(or a visible equivalent) on the home page that links to moodle.com.
-If you wish to remove the logo, re-brand Moodle, or redistribute 
-modifed copies of Moodle then please contact martin@dougiamas.com 
-to negotiate terms and pricing.";
+Redistribution of modified copies of Moodle must be distributed 
+as pristine base sources plus patches, so that 'unofficial' changes
+can be readily distinguished from the base source.
+
+There is one additional clause:
+
+All installed copies of Moodle on Internet web sites must retain the 
+\"Made with Moodle\" logo (or a visible equivalent) on the home page 
+as a link to moodle.com. If you wish to remove the logo or re-brand 
+this software as part of a commercial enterprise then please contact 
+martin@dougiamas.com to negotiate terms and pricing.";
 
 $string['grade'] = "Grade";
 $string['grades'] = "Grades";