diff --git a/LICENSE b/LICENSE
index 1bd1af8..428354d 100644
--- a/LICENSE
+++ b/LICENSE
@@ -1,4 +1,4 @@
-Copyright (c) 2004-2015 Nicholas J. Kain <njkain at gmail dot com>
+Copyright 2004-2015 Nicholas J. Kain <njkain at gmail dot com>
 All rights reserved.
 
 Redistribution and use in source and binary forms, with or without
diff --git a/README.md b/README.md
index ec0b48e..e83fc22 100644
--- a/README.md
+++ b/README.md
@@ -1,5 +1,5 @@
 # ndhc
-Copyright (C) 2004-2018 Nicholas J. Kain.
+Copyright 2004-2018 Nicholas J. Kain.
 
 See LICENSE for licensing information.  In short: Two-clause / New BSD.
 
diff --git a/src/arp.c b/src/arp.c
index cb18d1f..1faa029 100644
--- a/src/arp.c
+++ b/src/arp.c
@@ -1,6 +1,6 @@
 /* arp.c - arp ping checking
  *
- * Copyright (c) 2010-2018 Nicholas J. Kain <njkain at gmail dot com>
+ * Copyright 2010-2018 Nicholas J. Kain <njkain at gmail dot com>
  * All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
diff --git a/src/arp.h b/src/arp.h
index 160c074..28bc199 100644
--- a/src/arp.h
+++ b/src/arp.h
@@ -1,6 +1,6 @@
 /* arp.h - functions to call the interface change daemon
  *
- * Copyright (c) 2010-2018 Nicholas J. Kain <njkain at gmail dot com>
+ * Copyright 2010-2018 Nicholas J. Kain <njkain at gmail dot com>
  * All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
diff --git a/src/dhcp.c b/src/dhcp.c
index 295d227..3cf07cf 100644
--- a/src/dhcp.c
+++ b/src/dhcp.c
@@ -1,6 +1,6 @@
 /* dhcp.c - general DHCP protocol handling
  *
- * Copyright (c) 2004-2018 Nicholas J. Kain <njkain at gmail dot com>
+ * Copyright 2004-2018 Nicholas J. Kain <njkain at gmail dot com>
  * All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
diff --git a/src/dhcp.h b/src/dhcp.h
index 23bc3ee..99aa448 100644
--- a/src/dhcp.h
+++ b/src/dhcp.h
@@ -1,6 +1,6 @@
 /* dhcp.h - general DHCP protocol handling
  *
- * Copyright (c) 2004-2018 Nicholas J. Kain <njkain at gmail dot com>
+ * Copyright 2004-2018 Nicholas J. Kain <njkain at gmail dot com>
  * All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
diff --git a/src/duiaid.c b/src/duiaid.c
index 6328418..66ae61a 100644
--- a/src/duiaid.c
+++ b/src/duiaid.c
@@ -1,6 +1,6 @@
 /* duiaid.c - DUID/IAID storage and generation for clientids
  *
- * Copyright (c) 2014-2018 Nicholas J. Kain <njkain at gmail dot com>
+ * Copyright 2014-2018 Nicholas J. Kain <njkain at gmail dot com>
  * All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
diff --git a/src/duiaid.h b/src/duiaid.h
index a321248..b6c146d 100644
--- a/src/duiaid.h
+++ b/src/duiaid.h
@@ -1,6 +1,6 @@
 /* duiaid.h - DUID/IAID storage and generation for clientids
  *
- * Copyright (c) 2014-2018 Nicholas J. Kain <njkain at gmail dot com>
+ * Copyright 2014-2018 Nicholas J. Kain <njkain at gmail dot com>
  * All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
diff --git a/src/ifchange.c b/src/ifchange.c
index 7edc254..cf84f09 100644
--- a/src/ifchange.c
+++ b/src/ifchange.c
@@ -1,6 +1,6 @@
 /* ifchange.c - functions to call the interface change daemon
  *
- * Copyright (c) 2004-2018 Nicholas J. Kain <njkain at gmail dot com>
+ * Copyright 2004-2018 Nicholas J. Kain <njkain at gmail dot com>
  * All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
diff --git a/src/ifchange.h b/src/ifchange.h
index 5ab8ea9..af93028 100644
--- a/src/ifchange.h
+++ b/src/ifchange.h
@@ -1,6 +1,6 @@
 /* ifchange.h - functions to call the interface change daemon
  *
- * Copyright (c) 2004-2018 Nicholas J. Kain <njkain at gmail dot com>
+ * Copyright 2004-2018 Nicholas J. Kain <njkain at gmail dot com>
  * All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
diff --git a/src/ifchd-parse.h b/src/ifchd-parse.h
index 5b3e248..cec9a76 100644
--- a/src/ifchd-parse.h
+++ b/src/ifchd-parse.h
@@ -1,6 +1,6 @@
 /* ifchd-parse.h - interface change daemon parser
  *
- * Copyright (c) 2004-2018 Nicholas J. Kain <njkain at gmail dot com>
+ * Copyright 2004-2018 Nicholas J. Kain <njkain at gmail dot com>
  * All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
diff --git a/src/ifchd-parse.rl b/src/ifchd-parse.rl
index d9a73a9..e37f9c4 100644
--- a/src/ifchd-parse.rl
+++ b/src/ifchd-parse.rl
@@ -1,6 +1,6 @@
 /* ifchd-parse.rl - interface change daemon parser
  *
- * Copyright (c) 2004-2018 Nicholas J. Kain <njkain at gmail dot com>
+ * Copyright 2004-2018 Nicholas J. Kain <njkain at gmail dot com>
  * All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
diff --git a/src/ifchd.c b/src/ifchd.c
index ab4df92..121485e 100644
--- a/src/ifchd.c
+++ b/src/ifchd.c
@@ -1,6 +1,6 @@
 /* ifchd.c - interface change daemon
  *
- * Copyright (c) 2004-2018 Nicholas J. Kain <njkain at gmail dot com>
+ * Copyright 2004-2018 Nicholas J. Kain <njkain at gmail dot com>
  * All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
diff --git a/src/ifset.c b/src/ifset.c
index e701ac5..577d878 100644
--- a/src/ifset.c
+++ b/src/ifset.c
@@ -1,6 +1,6 @@
 /* ifset.c - Linux-specific net interface settings include
  *
- * Copyright (c) 2004-2018 Nicholas J. Kain <njkain at gmail dot com>
+ * Copyright 2004-2018 Nicholas J. Kain <njkain at gmail dot com>
  * All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
diff --git a/src/ifset.h b/src/ifset.h
index 4ab8e72..012ffe6 100644
--- a/src/ifset.h
+++ b/src/ifset.h
@@ -1,6 +1,6 @@
 /* ifset.h - Linux-specific net interface settings include
  *
- * Copyright (c) 2004-2018 Nicholas J. Kain <njkain at gmail dot com>
+ * Copyright 2004-2018 Nicholas J. Kain <njkain at gmail dot com>
  * All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
diff --git a/src/leasefile.c b/src/leasefile.c
index 93f1c78..c7bba88 100644
--- a/src/leasefile.c
+++ b/src/leasefile.c
@@ -1,6 +1,6 @@
 /* leasefile.c - functions for writing the lease file
  *
- * Copyright (c) 2011-2018 Nicholas J. Kain <njkain at gmail dot com>
+ * Copyright 2011-2018 Nicholas J. Kain <njkain at gmail dot com>
  * All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
diff --git a/src/leasefile.h b/src/leasefile.h
index 05610b3..4406ca0 100644
--- a/src/leasefile.h
+++ b/src/leasefile.h
@@ -1,6 +1,6 @@
 /* leasefile.h - functions for writing the lease file
  *
- * Copyright (c) 2011-2018 Nicholas J. Kain <njkain at gmail dot com>
+ * Copyright 2011-2018 Nicholas J. Kain <njkain at gmail dot com>
  * All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
diff --git a/src/ndhc.c b/src/ndhc.c
index 4f59cde..a44b13a 100644
--- a/src/ndhc.c
+++ b/src/ndhc.c
@@ -1,6 +1,6 @@
 /* ndhc.c - DHCP client
  *
- * Copyright (c) 2004-2018 Nicholas J. Kain <njkain at gmail dot com>
+ * Copyright 2004-2018 Nicholas J. Kain <njkain at gmail dot com>
  * All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
@@ -98,7 +98,7 @@ void set_client_addr(const char v[static 1]) { cs.clientAddr = inet_addr(v); }
 void print_version(void)
 {
     printf("ndhc %s, dhcp client.\n", NDHC_VERSION);
-    printf("Copyright (c) 2004-2018 Nicholas J. Kain\n"
+    printf("Copyright 2004-2018 Nicholas J. Kain\n"
            "All rights reserved.\n\n"
            "Redistribution and use in source and binary forms, with or without\n"
            "modification, are permitted provided that the following conditions are met:\n\n"
@@ -125,7 +125,7 @@ void show_usage(void)
 {
     printf(
 "ndhc " NDHC_VERSION ", dhcp client.  Licensed under 2-clause BSD.\n"
-"Copyright (C) 2004-2018 Nicholas J. Kain\n"
+"Copyright 2004-2018 Nicholas J. Kain\n"
 "Usage: ndhc [OPTIONS]\n\n"
 "  -c, --config=FILE               Path to ndhc configuration file\n"
 "  -I, --clientid=CLIENTID         Client identifier\n"
diff --git a/src/ndhc.h b/src/ndhc.h
index 76409ae..f3b2079 100644
--- a/src/ndhc.h
+++ b/src/ndhc.h
@@ -1,6 +1,6 @@
 /* ndhc.h - DHCP client
  *
- * Copyright (c) 2014-2018 Nicholas J. Kain <njkain at gmail dot com>
+ * Copyright 2014-2018 Nicholas J. Kain <njkain at gmail dot com>
  * All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
diff --git a/src/netlink.c b/src/netlink.c
index 5b41a8f..2a4d962 100644
--- a/src/netlink.c
+++ b/src/netlink.c
@@ -1,6 +1,6 @@
 /* netlink.c - netlink physical link notification handling and info retrieval
  *
- * Copyright (c) 2011-2018 Nicholas J. Kain <njkain at gmail dot com>
+ * Copyright 2011-2018 Nicholas J. Kain <njkain at gmail dot com>
  * All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
diff --git a/src/netlink.h b/src/netlink.h
index 13700f2..a031894 100644
--- a/src/netlink.h
+++ b/src/netlink.h
@@ -1,6 +1,6 @@
 /* netlink.h - netlink physical link notification handling and info retrieval
  *
- * Copyright (c) 2011-2018 Nicholas J. Kain <njkain at gmail dot com>
+ * Copyright 2011-2018 Nicholas J. Kain <njkain at gmail dot com>
  * All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
diff --git a/src/nl.c b/src/nl.c
index 68f01d2..31d72e3 100644
--- a/src/nl.c
+++ b/src/nl.c
@@ -1,6 +1,6 @@
 /* nl.c - low level netlink protocol functions
  *
- * Copyright (c) 2011-2018 Nicholas J. Kain <njkain at gmail dot com>
+ * Copyright 2011-2018 Nicholas J. Kain <njkain at gmail dot com>
  * All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
diff --git a/src/nl.h b/src/nl.h
index 0b2a836..e85f1fa 100644
--- a/src/nl.h
+++ b/src/nl.h
@@ -1,6 +1,6 @@
 /* nl.h - low level netlink protocol functions
  *
- * Copyright (c) 2011-2018 Nicholas J. Kain <njkain at gmail dot com>
+ * Copyright 2011-2018 Nicholas J. Kain <njkain at gmail dot com>
  * All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
diff --git a/src/options.c b/src/options.c
index a58e01e..f3eb612 100644
--- a/src/options.c
+++ b/src/options.c
@@ -1,6 +1,6 @@
 /* options.c - DHCP options handling
  *
- * Copyright (c) 2004-2018 Nicholas J. Kain <njkain at gmail dot com>
+ * Copyright 2004-2018 Nicholas J. Kain <njkain at gmail dot com>
  * All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
diff --git a/src/options.h b/src/options.h
index 2279ade..43e3fbf 100644
--- a/src/options.h
+++ b/src/options.h
@@ -1,6 +1,6 @@
 /* options.h - DHCP options handling
  *
- * Copyright (c) 2004-2018 Nicholas J. Kain <njkain at gmail dot com>
+ * Copyright 2004-2018 Nicholas J. Kain <njkain at gmail dot com>
  * All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
diff --git a/src/rfkill.c b/src/rfkill.c
index d8ef0af..4a927eb 100644
--- a/src/rfkill.c
+++ b/src/rfkill.c
@@ -1,6 +1,6 @@
 /* rfkill.c - rfkill interface and handling
  *
- * Copyright (c) 2015-2018 Nicholas J. Kain <njkain at gmail dot com>
+ * Copyright 2015-2018 Nicholas J. Kain <njkain at gmail dot com>
  * All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
diff --git a/src/rfkill.h b/src/rfkill.h
index 10d53a2..9bca197 100644
--- a/src/rfkill.h
+++ b/src/rfkill.h
@@ -2,7 +2,7 @@
 #define NDHC_RFKILL_H_
 /* rfkill.h - rfkill interface and handling
  *
- * Copyright (c) 2015-2018 Nicholas J. Kain <njkain at gmail dot com>
+ * Copyright 2015-2018 Nicholas J. Kain <njkain at gmail dot com>
  * All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
diff --git a/src/sockd.c b/src/sockd.c
index db916d1..e44b22a 100644
--- a/src/sockd.c
+++ b/src/sockd.c
@@ -1,6 +1,6 @@
 /* sockd.c - privsep socket creation daemon
  *
- * Copyright (c) 2014-2018 Nicholas J. Kain <njkain at gmail dot com>
+ * Copyright 2014-2018 Nicholas J. Kain <njkain at gmail dot com>
  * All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
diff --git a/src/state.c b/src/state.c
index e7d6571..e3d8f9f 100644
--- a/src/state.c
+++ b/src/state.c
@@ -1,6 +1,6 @@
 /* state.c - high level DHCP state machine
  *
- * Copyright (c) 2011-2018 Nicholas J. Kain <njkain at gmail dot com>
+ * Copyright 2011-2018 Nicholas J. Kain <njkain at gmail dot com>
  * All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
diff --git a/src/state.h b/src/state.h
index 43621ad..dc43dd7 100644
--- a/src/state.h
+++ b/src/state.h
@@ -1,6 +1,6 @@
 /* state.h - high level DHCP state machine
  *
- * Copyright (c) 2011-2018 Nicholas J. Kain <njkain at gmail dot com>
+ * Copyright 2011-2018 Nicholas J. Kain <njkain at gmail dot com>
  * All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
diff --git a/src/sys.c b/src/sys.c
index b596adf..8bdbfd6 100644
--- a/src/sys.c
+++ b/src/sys.c
@@ -1,6 +1,6 @@
 /* sys.c - linux-specific signal and epoll functions
  *
- * Copyright (c) 2010-2018 Nicholas J. Kain <njkain at gmail dot com>
+ * Copyright 2010-2018 Nicholas J. Kain <njkain at gmail dot com>
  * All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
diff --git a/src/sys.h b/src/sys.h
index b7d3c58..2a499bf 100644
--- a/src/sys.h
+++ b/src/sys.h
@@ -1,6 +1,6 @@
 /* sys.h - linux-specific signal and epoll functions
  *
- * Copyright (c) 2010-2018 Nicholas J. Kain <njkain at gmail dot com>
+ * Copyright 2010-2018 Nicholas J. Kain <njkain at gmail dot com>
  * All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without