mksh is covered by The MirOS Licence:
/*-
- * Copyright © 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009, 2010
+ * Copyright © 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009, 2010,
+ * 2011, 2012, 2013
* Thorsten Glaser <tg@mirbsd.org>
*
* Provided that these terms and disclaimer and all copyright notices