Rework section 4.

doc/guide/LICENSE

@@ -15,9 +15,10 @@ with the distribution.
 
 3. Redistributions must contain a verbatim copy of this document.
 
-4. The names of the authors and copyright holders must not be used
-to endorse or promote products derived from this Software without
-their specific prior written permission.
+4. The names and trademarks of the authors and copyright holders
+must not be used in advertising or otherwise to promote the sale,
+use or other dealing in this Software without specific prior written
+permission.
 
 5. Due credit should be given to the OpenLDAP Project.