-libpng version 1.2.6, September 12, 2004, is
-Copyright (c) 2004 Glenn Randers-Pehrson, and is
+This code is released under the libpng license.
+
+libpng versions 1.2.6, August 15, 2004, through 1.5.7, December 15, 2011, are
+Copyright (c) 2004, 2006-2011 Glenn Randers-Pehrson, and are