[devel] Mention zlib-libpng license in each source file
diff --git a/pngtrans.c b/pngtrans.c
index f6174a2..cd9730a 100644
--- a/pngtrans.c
+++ b/pngtrans.c
@@ -2,10 +2,13 @@
/* pngtrans.c - transforms the data in a row (used by both readers and writers)
*
* Last changed in libpng 1.4.0 [June 24, 2009]
- * For conditions of distribution and use, see copyright notice in png.h
* Copyright (c) 1998-2009 Glenn Randers-Pehrson
* (Version 0.96 Copyright (c) 1996, 1997 Andreas Dilger)
* (Version 0.88 Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.)
+ *
+ * This code is released under the zlib-libpng license.
+ * For conditions of distribution and use, see copyright notice in png.h
+ *
*/
#include "png.h"