Update copyright information and license headers
diff --git a/ltrace-elf.h b/ltrace-elf.h
index e8fb460..7cd1369 100644
--- a/ltrace-elf.h
+++ b/ltrace-elf.h
@@ -1,3 +1,26 @@
+/*
+ * This file is part of ltrace.
+ * Copyright (C) 2006,2010,2012 Petr Machata, Red Hat Inc.
+ * Copyright (C) 2010 Zachary T Welch
+ * Copyright (C) 2001,2004,2007,2009 Juan Cespedes
+ * Copyright (C) 2006 Ian Wienand
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License as
+ * published by the Free Software Foundation; either version 2 of the
+ * License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ * General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
+ * 02110-1301 USA
+ */
+
#ifndef LTRACE_ELF_H
#define LTRACE_ELF_H