slight license edit: make the extra paragraph correspond exactly to t…

…he W3Cs version, and explain it

LICENSE

@@ -1,7 +1,11 @@
-Portions of this software are subject to the license below. The relevant
+Portions of this software are subject to the license below.  The relevant
 source files are clearly marked; they refer to this file using the phrase
-"the Click LICENSE file".  The AUTHORS file lists the people who have
-contributed to this software.
+"the Click LICENSE file".  This license is an MIT license, plus a clause
+(taken from the W3C license) requiring prior written permission to use our
+names in publicity.  The AUTHORS file lists the people who have contributed
+to this software.
+
+===========================================================================
 
 (c) 1999-2007 Massachusetts Institute of Technology
 (c) 2000-2007 Mazu Networks, Inc.
@@ -18,10 +22,10 @@ Software is furnished to do so, subject to the following conditions:
 The above copyright notice and this permission notice shall be included in
 all copies or substantial portions of the Software.
 
-The names and trademarks of copyright holders may not be used in
-advertising or publicity pertaining to the software without specific
-prior permission. Title to copyright in this software and any associated
-documentation will at all times remain with the copyright holders.
+The name and trademarks of copyright holders may NOT be used in advertising
+or publicity pertaining to the Software without specific, written prior
+permission. Title to copyright in this Software and any associated
+documentation will at all times remain with copyright holders.
 
 THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,