diff --git a/include/c.h b/include/c.h
index 94b0c3681..812692885 100644
--- a/include/c.h
+++ b/include/c.h
@@ -1,7 +1,9 @@
 /*
  * Fundamental C definitions.
+ *
+ * No copyright is claimed.  This code is in the public domain; do with
+ * it what you wish.
  */
-
 #ifndef UTIL_LINUX_C_H
 #define UTIL_LINUX_C_H
 
diff --git a/include/monotonic.h b/include/monotonic.h
index 296173ece..7a69d9e4b 100644
--- a/include/monotonic.h
+++ b/include/monotonic.h
@@ -1,3 +1,7 @@
+/*
+ * No copyright is claimed.  This code is in the public domain; do with
+ * it what you wish.
+ */
 #ifndef UTIL_LINUX_MONOTONIC_H
 #define UTIL_LINUX_MONOTONIC_H
 
diff --git a/include/namespace.h b/include/namespace.h
index 9dbe88aa0..c48602d70 100644
--- a/include/namespace.h
+++ b/include/namespace.h
@@ -1,4 +1,10 @@
-/* Compat code so unshare and setns can be used with older libcs */
+
+/*
+ * No copyright is claimed.  This code is in the public domain; do with
+ * it what you wish.
+ *
+ * Compat code so unshare and setns can be used with older libcs
+ */
 #ifndef UTIL_LINUX_NAMESPACE_H
 # define UTIL_LINUX_NAMESPACE_H
 
diff --git a/lib/mangle.c b/lib/mangle.c
index 87802fbda..1a3b89ae4 100644
--- a/lib/mangle.c
+++ b/lib/mangle.c
@@ -1,7 +1,8 @@
 /*
  * Functions for \oct encoding used in mtab/fstab/swaps/etc.
  *
- * Based on code from mount(8).
+ * No copyright is claimed.  This code is in the public domain; do with
+ * it what you wish.
  *
  * Copyright (C) 2010 Karel Zak <kzak@redhat.com>
  */
diff --git a/lib/monotonic.c b/lib/monotonic.c
index 96ead1ee0..b684d8dd6 100644
--- a/lib/monotonic.c
+++ b/lib/monotonic.c
@@ -1,6 +1,9 @@
 /*
  * Please, don't add this file to libcommon because clock_gettime() requires
  * -lrt on systems with old libc.
+ *
+ * No copyright is claimed.  This code is in the public domain; do with
+ * it what you wish.
  */
 #include <time.h>
 #include <signal.h>