diff --git a/CHANGES b/CHANGES
index ce47a2d..ee15bd0 100644
--- a/CHANGES
+++ b/CHANGES
@@ -6,6 +6,9 @@ testing:
 
 	improved proxy.sh - it now also takes hostnames
 
+legal:
+	Added contributors to copyright notices. Suggested by Matt Braithwaite.
+
 ####################### V 1.7.3.1:
 
 security:
diff --git a/Config/Makefile.AIX-5-1 b/Config/Makefile.AIX-5-1
index 98b404d..0226892 100644
--- a/Config/Makefile.AIX-5-1
+++ b/Config/Makefile.AIX-5-1
@@ -1,5 +1,5 @@
 # source: Makefile.AIX-5-1
-# Copyright Gerhard Rieger 2001-2006
+# Copyright Gerhard Rieger and contributors (see file CHANGES)
 # Published under the GNU General Public License V.2, see file COPYING
 
 # note: @...@ forms are filled in by configure script
diff --git a/Config/Makefile.AIX-5-3 b/Config/Makefile.AIX-5-3
index e07ac40..2565510 100644
--- a/Config/Makefile.AIX-5-3
+++ b/Config/Makefile.AIX-5-3
@@ -1,5 +1,5 @@
 # source: Makefile.in
-# Copyright Gerhard Rieger 2001-2008
+# Copyright Gerhard Rieger and contributors (see file CHANGES)
 # Published under the GNU General Public License V.2, see file COPYING
 
 # note: @...@ forms are filled in by configure script
diff --git a/Config/Makefile.Cygwin-1-5-25 b/Config/Makefile.Cygwin-1-5-25
index c152950..1972656 100644
--- a/Config/Makefile.Cygwin-1-5-25
+++ b/Config/Makefile.Cygwin-1-5-25
@@ -1,5 +1,5 @@
 # source: Makefile.in
-# Copyright Gerhard Rieger 2001-2008
+# Copyright Gerhard Rieger and contributors (see file CHANGES)
 # Published under the GNU General Public License V.2, see file COPYING
 
 # note: @...@ forms are filled in by configure script
diff --git a/Config/Makefile.FreeBSD-6-1 b/Config/Makefile.FreeBSD-6-1
index 2cd0bfe..f75443b 100644
--- a/Config/Makefile.FreeBSD-6-1
+++ b/Config/Makefile.FreeBSD-6-1
@@ -1,5 +1,5 @@
 # source: Makefile.in
-# Copyright Gerhard Rieger 2001-2008
+# Copyright Gerhard Rieger and contributors (see file CHANGES)
 # Published under the GNU General Public License V.2, see file COPYING
 
 # note: @...@ forms are filled in by configure script
diff --git a/Config/Makefile.HP-UX-B-11-11 b/Config/Makefile.HP-UX-B-11-11
index 4afa954..22ad4b3 100644
--- a/Config/Makefile.HP-UX-B-11-11
+++ b/Config/Makefile.HP-UX-B-11-11
@@ -1,5 +1,5 @@
 # source: Makefile.HP-UX-B-11-11
-# Copyright Gerhard Rieger 2001-2006
+# Copyright Gerhard Rieger and contributors (see file CHANGES)
 # Published under the GNU General Public License V.2, see file COPYING
 
 # note: @...@ forms are filled in by configure script
diff --git a/Config/Makefile.Linux-2-6-16 b/Config/Makefile.Linux-2-6-16
index 8c8b961..a5ba1ac 100644
--- a/Config/Makefile.Linux-2-6-16
+++ b/Config/Makefile.Linux-2-6-16
@@ -1,5 +1,5 @@
 # source: Makefile.Linux-2-6-16
-# Copyright Gerhard Rieger 2001-2006
+# Copyright Gerhard Rieger and contributors (see file CHANGES)
 # Published under the GNU General Public License V.2, see file COPYING
 
 # note: @...@ forms are filled in by configure script
diff --git a/Config/Makefile.Linux-2-6-24 b/Config/Makefile.Linux-2-6-24
index 58e0608..e39b63b 100644
--- a/Config/Makefile.Linux-2-6-24
+++ b/Config/Makefile.Linux-2-6-24
@@ -1,5 +1,5 @@
 # source: Makefile.in
-# Copyright Gerhard Rieger 2001-2008
+# Copyright Gerhard Rieger and contributors (see file CHANGES)
 # Published under the GNU General Public License V.2, see file COPYING
 
 # note: @...@ forms are filled in by configure script
diff --git a/Config/Makefile.MacOSX-10-5 b/Config/Makefile.MacOSX-10-5
index 43a8f72..2a808e7 100644
--- a/Config/Makefile.MacOSX-10-5
+++ b/Config/Makefile.MacOSX-10-5
@@ -1,5 +1,5 @@
 # source: Makefile.in
-# Copyright Gerhard Rieger 2001-2008
+# Copyright Gerhard Rieger and contributors (see file CHANGES)
 # Published under the GNU General Public License V.2, see file COPYING
 
 # note: @...@ forms are filled in by configure script
diff --git a/Config/Makefile.NetBSD-2-0-2 b/Config/Makefile.NetBSD-2-0-2
index 05fa303..7caed82 100644
--- a/Config/Makefile.NetBSD-2-0-2
+++ b/Config/Makefile.NetBSD-2-0-2
@@ -1,5 +1,5 @@
 # source: Makefile.NetBSD-2-0-2
-# Copyright Gerhard Rieger 2001-2006
+# Copyright Gerhard Rieger and contributors (see file CHANGES)
 # Published under the GNU General Public License V.2, see file COPYING
 
 # note: @...@ forms are filled in by configure script
diff --git a/Config/Makefile.NetBSD-4-0 b/Config/Makefile.NetBSD-4-0
index 5f6256a..b0e67bf 100644
--- a/Config/Makefile.NetBSD-4-0
+++ b/Config/Makefile.NetBSD-4-0
@@ -1,5 +1,5 @@
 # source: Makefile.in
-# Copyright Gerhard Rieger 2001-2008
+# Copyright Gerhard Rieger and contributors (see file CHANGES)
 # Published under the GNU General Public License V.2, see file COPYING
 
 # note: @...@ forms are filled in by configure script
diff --git a/Config/Makefile.NetBSD-5-1 b/Config/Makefile.NetBSD-5-1
index 5f6256a..b0e67bf 100644
--- a/Config/Makefile.NetBSD-5-1
+++ b/Config/Makefile.NetBSD-5-1
@@ -1,5 +1,5 @@
 # source: Makefile.in
-# Copyright Gerhard Rieger 2001-2008
+# Copyright Gerhard Rieger and contributors (see file CHANGES)
 # Published under the GNU General Public License V.2, see file COPYING
 
 # note: @...@ forms are filled in by configure script
diff --git a/Config/Makefile.OpenBSD-3-8 b/Config/Makefile.OpenBSD-3-8
index a3f29f8..ae41d02 100644
--- a/Config/Makefile.OpenBSD-3-8
+++ b/Config/Makefile.OpenBSD-3-8
@@ -1,5 +1,5 @@
 # source: Makefile.OpenBSD-3-8
-# Copyright Gerhard Rieger 2001-2006
+# Copyright Gerhard Rieger and contributors (see file CHANGES)
 # Published under the GNU General Public License V.2, see file COPYING
 
 # note: @...@ forms are filled in by configure script
diff --git a/Config/Makefile.OpenBSD-4-3 b/Config/Makefile.OpenBSD-4-3
index 2683fcc..375c120 100644
--- a/Config/Makefile.OpenBSD-4-3
+++ b/Config/Makefile.OpenBSD-4-3
@@ -1,5 +1,5 @@
 # source: Makefile.in
-# Copyright Gerhard Rieger 2001-2008
+# Copyright Gerhard Rieger and contributors (see file CHANGES)
 # Published under the GNU General Public License V.2, see file COPYING
 
 # note: @...@ forms are filled in by configure script
diff --git a/Config/Makefile.SunOS-5-10 b/Config/Makefile.SunOS-5-10
index d3d5901..5bd38be 100644
--- a/Config/Makefile.SunOS-5-10
+++ b/Config/Makefile.SunOS-5-10
@@ -1,5 +1,5 @@
 # source: Makefile.in
-# Copyright Gerhard Rieger 2001-2008
+# Copyright Gerhard Rieger and contributors (see file CHANGES)
 # Published under the GNU General Public License V.2, see file COPYING
 
 # note: @...@ forms are filled in by configure script
diff --git a/Config/Makefile.SunOS-5-8 b/Config/Makefile.SunOS-5-8
index 9de9548..d221d6b 100644
--- a/Config/Makefile.SunOS-5-8
+++ b/Config/Makefile.SunOS-5-8
@@ -1,5 +1,5 @@
 # source: Makefile.SunOS-5-8
-# Copyright Gerhard Rieger 2001-2006
+# Copyright Gerhard Rieger and contributors (see file CHANGES)
 # Published under the GNU General Public License V.2, see file COPYING
 
 # note: @...@ forms are filled in by configure script
diff --git a/Config/Makefile.Tru64-5-1B b/Config/Makefile.Tru64-5-1B
index ca26440..d5656e1 100644
--- a/Config/Makefile.Tru64-5-1B
+++ b/Config/Makefile.Tru64-5-1B
@@ -1,5 +1,5 @@
 # source: Makefile.Tru64-5-1B
-# Copyright Gerhard Rieger 2001-2006
+# Copyright Gerhard Rieger and contributors (see file CHANGES)
 # Published under the GNU General Public License V.2, see file COPYING
 
 # note: @...@ forms are filled in by configure script
diff --git a/Config/config.AIX-5-1.h b/Config/config.AIX-5-1.h
index 4d79b57..554c36d 100644
--- a/Config/config.AIX-5-1.h
+++ b/Config/config.AIX-5-1.h
@@ -1,6 +1,6 @@
 /* config.h.  Generated by configure.  */
 /* source: Config/config.AIX-5-1.h */
-/* Copyright Gerhard Rieger 2001-2006 */
+/* Copyright Gerhard Rieger and contributors (see file CHANGES) */
 /* Published under the GNU General Public License V.2, see file COPYING */
 
 #ifndef __config_h_included
diff --git a/Config/config.AIX-5-3.h b/Config/config.AIX-5-3.h
index 9c0fec2..f2c7e94 100644
--- a/Config/config.AIX-5-3.h
+++ b/Config/config.AIX-5-3.h
@@ -1,6 +1,6 @@
 /* config.h.  Generated from config.h.in by configure.  */
 /* source: config.h.in */
-/* Copyright Gerhard Rieger 2001-2008 */
+/* Copyright Gerhard Rieger and contributors (see file CHANGES) */
 /* Published under the GNU General Public License V.2, see file COPYING */
 
 #ifndef __config_h_included
diff --git a/Config/config.Cygwin-1-5-25.h b/Config/config.Cygwin-1-5-25.h
index 096580f..8840369 100644
--- a/Config/config.Cygwin-1-5-25.h
+++ b/Config/config.Cygwin-1-5-25.h
@@ -1,6 +1,6 @@
 /* config.h.  Generated from config.h.in by configure.  */
 /* source: config.h.in */
-/* Copyright Gerhard Rieger 2001-2008 */
+/* Copyright Gerhard Rieger and contributors (see file CHANGES) */
 /* Published under the GNU General Public License V.2, see file COPYING */
 
 #ifndef __config_h_included
diff --git a/Config/config.FreeBSD-6-1.h b/Config/config.FreeBSD-6-1.h
index aad86e3..3cc3081 100644
--- a/Config/config.FreeBSD-6-1.h
+++ b/Config/config.FreeBSD-6-1.h
@@ -1,6 +1,6 @@
 /* config.h.  Generated from config.h.in by configure.  */
 /* source: config.h.in */
-/* Copyright Gerhard Rieger 2001-2008 */
+/* Copyright Gerhard Rieger and contributors (see file CHANGES) */
 /* Published under the GNU General Public License V.2, see file COPYING */
 
 #ifndef __config_h_included
diff --git a/Config/config.HP-UX-B-11-11.h b/Config/config.HP-UX-B-11-11.h
index 903138d..aa7743c 100644
--- a/Config/config.HP-UX-B-11-11.h
+++ b/Config/config.HP-UX-B-11-11.h
@@ -1,6 +1,6 @@
 /* config.h.  Generated by configure.  */
 /* source: Config/config.HP-UX-B-11-11.h */
-/* Copyright Gerhard Rieger 2001-2007 */
+/* Copyright Gerhard Rieger and contributors (see file CHANGES) */
 /* Published under the GNU General Public License V.2, see file COPYING */
 
 #ifndef __config_h_included
diff --git a/Config/config.Linux-2-6-16.h b/Config/config.Linux-2-6-16.h
index bbcc32e..fd8020f 100644
--- a/Config/config.Linux-2-6-16.h
+++ b/Config/config.Linux-2-6-16.h
@@ -1,6 +1,6 @@
 /* config.h.  Generated by configure.  */
 /* source: Config/config.Linux-2-6-16.h */
-/* Copyright Gerhard Rieger 2001-2007 */
+/* Copyright Gerhard Rieger and contributors (see file CHANGES) */
 /* Published under the GNU General Public License V.2, see file COPYING */
 
 #ifndef __config_h_included
diff --git a/Config/config.Linux-2-6-24.h b/Config/config.Linux-2-6-24.h
index 94dc9b8..4936971 100644
--- a/Config/config.Linux-2-6-24.h
+++ b/Config/config.Linux-2-6-24.h
@@ -1,6 +1,6 @@
 /* config.h.  Generated from config.h.in by configure.  */
 /* source: config.h.in */
-/* Copyright Gerhard Rieger 2001-2008 */
+/* Copyright Gerhard Rieger and contributors (see file CHANGES) */
 /* Published under the GNU General Public License V.2, see file COPYING */
 
 #ifndef __config_h_included
diff --git a/Config/config.MacOSX-10-5.h b/Config/config.MacOSX-10-5.h
index c19ca9e..4a0fce7 100644
--- a/Config/config.MacOSX-10-5.h
+++ b/Config/config.MacOSX-10-5.h
@@ -1,6 +1,6 @@
 /* config.h.  Generated from config.h.in by configure.  */
 /* source: config.h.in */
-/* Copyright Gerhard Rieger 2001-2008 */
+/* Copyright Gerhard Rieger and contributors (see file CHANGES) */
 /* Published under the GNU General Public License V.2, see file COPYING */
 
 #ifndef __config_h_included
diff --git a/Config/config.NetBSD-2-0-2.h b/Config/config.NetBSD-2-0-2.h
index fdbcb55..dab7022 100644
--- a/Config/config.NetBSD-2-0-2.h
+++ b/Config/config.NetBSD-2-0-2.h
@@ -1,6 +1,6 @@
 /* config.h.  Generated by configure.  */
 /* source: Config/config.NetBSD-2-0-2.h */
-/* Copyright Gerhard Rieger 2001-2006 */
+/* Copyright Gerhard Rieger and contributors (see file CHANGES) */
 /* Published under the GNU General Public License V.2, see file COPYING */
 
 #ifndef __config_h_included
diff --git a/Config/config.NetBSD-4-0.h b/Config/config.NetBSD-4-0.h
index 27f18a9..aa94d68 100644
--- a/Config/config.NetBSD-4-0.h
+++ b/Config/config.NetBSD-4-0.h
@@ -1,6 +1,6 @@
 /* config.h.  Generated from config.h.in by configure.  */
 /* source: config.h.in */
-/* Copyright Gerhard Rieger 2001-2008 */
+/* Copyright Gerhard Rieger and contributors (see file CHANGES) */
 /* Published under the GNU General Public License V.2, see file COPYING */
 
 #ifndef __config_h_included
diff --git a/Config/config.NetBSD-5-1.h b/Config/config.NetBSD-5-1.h
index 27f18a9..aa94d68 100644
--- a/Config/config.NetBSD-5-1.h
+++ b/Config/config.NetBSD-5-1.h
@@ -1,6 +1,6 @@
 /* config.h.  Generated from config.h.in by configure.  */
 /* source: config.h.in */
-/* Copyright Gerhard Rieger 2001-2008 */
+/* Copyright Gerhard Rieger and contributors (see file CHANGES) */
 /* Published under the GNU General Public License V.2, see file COPYING */
 
 #ifndef __config_h_included
diff --git a/Config/config.OpenBSD-3-8.h b/Config/config.OpenBSD-3-8.h
index 00dfa23..ddd23d3 100644
--- a/Config/config.OpenBSD-3-8.h
+++ b/Config/config.OpenBSD-3-8.h
@@ -1,6 +1,6 @@
 /* config.h.  Generated by configure.  */
 /* source: Config/config.OpenBSD-3-8.h */
-/* Copyright Gerhard Rieger 2001-2006 */
+/* Copyright Gerhard Rieger and contributors (see file CHANGES) */
 /* Published under the GNU General Public License V.2, see file COPYING */
 
 #ifndef __config_h_included
diff --git a/Config/config.OpenBSD-4-3.h b/Config/config.OpenBSD-4-3.h
index a3852e1..6b82d38 100644
--- a/Config/config.OpenBSD-4-3.h
+++ b/Config/config.OpenBSD-4-3.h
@@ -1,6 +1,6 @@
 /* config.h.  Generated from config.h.in by configure.  */
 /* source: config.h.in */
-/* Copyright Gerhard Rieger 2001-2008 */
+/* Copyright Gerhard Rieger and contributors (see file CHANGES) */
 /* Published under the GNU General Public License V.2, see file COPYING */
 
 #ifndef __config_h_included
diff --git a/Config/config.SunOS-5-10.h b/Config/config.SunOS-5-10.h
index 1745c80..cf2eba2 100644
--- a/Config/config.SunOS-5-10.h
+++ b/Config/config.SunOS-5-10.h
@@ -1,6 +1,6 @@
 /* config.h.  Generated from config.h.in by configure.  */
 /* source: config.h.in */
-/* Copyright Gerhard Rieger 2001-2008 */
+/* Copyright Gerhard Rieger and contributors (see file CHANGES) */
 /* Published under the GNU General Public License V.2, see file COPYING */
 
 #ifndef __config_h_included
diff --git a/Config/config.SunOS-5-8.h b/Config/config.SunOS-5-8.h
index 63dc9af..4ccd97f 100644
--- a/Config/config.SunOS-5-8.h
+++ b/Config/config.SunOS-5-8.h
@@ -1,6 +1,6 @@
 /* config.h.  Generated by configure.  */
 /* source: Config/config.SunOS-5-8.h */
-/* Copyright Gerhard Rieger 2001-2007 */
+/* Copyright Gerhard Rieger and contributors (see file CHANGES) */
 /* Published under the GNU General Public License V.2, see file COPYING */
 
 #ifndef __config_h_included
diff --git a/Config/config.Tru64-5-1B.h b/Config/config.Tru64-5-1B.h
index 45ae042..4e2f78f 100644
--- a/Config/config.Tru64-5-1B.h
+++ b/Config/config.Tru64-5-1B.h
@@ -1,6 +1,6 @@
 /* config.h.  Generated by configure.  */
 /* source: Config/config.Tru64-5-1B.h */
-/* Copyright Gerhard Rieger 2001-2006 */
+/* Copyright Gerhard Rieger and contributors (see file CHANGES) */
 /* Published under the GNU General Public License V.2, see file COPYING */
 
 #ifndef __config_h_included
diff --git a/Makefile.in b/Makefile.in
index f2a6edb..c748a41 100644
--- a/Makefile.in
+++ b/Makefile.in
@@ -1,5 +1,5 @@
 # source: Makefile.in
-# Copyright Gerhard Rieger
+# Copyright Gerhard Rieger and contributors (see file CHANGES)
 # Published under the GNU General Public License V.2, see file COPYING
 
 # note: @...@ forms are filled in by configure script
diff --git a/compat.h b/compat.h
index c8bee4d..85befd3 100644
--- a/compat.h
+++ b/compat.h
@@ -1,5 +1,5 @@
 /* source: compat.h */
-/* Copyright Gerhard Rieger */
+/* Copyright Gerhard Rieger and contributors (see file CHANGES) */
 /* Published under the GNU General Public License V.2, see file COPYING */
 
 #ifndef __compat_h_included
diff --git a/config.h.in b/config.h.in
index 3f28702..414379b 100644
--- a/config.h.in
+++ b/config.h.in
@@ -1,5 +1,5 @@
 /* source: config.h.in */
-/* Copyright Gerhard Rieger */
+/* Copyright Gerhard Rieger and contributors (see file CHANGES) */
 /* Published under the GNU General Public License V.2, see file COPYING */
 
 #ifndef __config_h_included
diff --git a/configure.in b/configure.in
index e1b7f4c..6db8709 100644
--- a/configure.in
+++ b/configure.in
@@ -1,5 +1,5 @@
 dnl source: configure.in
-dnl Copyright Gerhard Rieger
+dnl Copyright Gerhard Rieger and contributors (see file CHANGES)
 dnl Published under the GNU General Public License V.2, see file COPYING
 
 dnl Process this file with autoconf to produce a configure script.
diff --git a/daemon.sh b/daemon.sh
index 2a9167a..422c556 100755
--- a/daemon.sh
+++ b/daemon.sh
@@ -1,6 +1,6 @@
 #! /bin/sh
 # source: daemon.sh
-# Copyright Gerhard Rieger 2001
+# Copyright Gerhard Rieger and contributors (see file CHANGES)
 # Published under the GNU General Public License V.2, see file COPYING
 
 # This script assumes that you create group daemon1 and user daemon1 before.
diff --git a/dalan.c b/dalan.c
index 2bf4dd2..99b9f2a 100644
--- a/dalan.c
+++ b/dalan.c
@@ -1,5 +1,5 @@
 /* source: dalan.c */
-/* Copyright Gerhard Rieger */
+/* Copyright Gerhard Rieger and contributors (see file CHANGES) */
 /* Published under the GNU General Public License V.2, see file COPYING */
 
 /* idea of a low level data description language. currently only a most
diff --git a/dalan.h b/dalan.h
index 7fd6e5f..d1e50ea 100644
--- a/dalan.h
+++ b/dalan.h
@@ -1,5 +1,5 @@
 /* source: dalan.h */
-/* Copyright Gerhard Rieger 2001 */
+/* Copyright Gerhard Rieger and contributors (see file CHANGES) */
 /* Published under the GNU General Public License V.2, see file COPYING */
 
 #ifndef __dalan_h_included
diff --git a/doc/xio.help b/doc/xio.help
index 3a6eb8d..2053419 100644
--- a/doc/xio.help
+++ b/doc/xio.help
@@ -1,5 +1,5 @@
 # source: xio.help
-# Copyright Gerhard Rieger 2001-2010
+# Copyright Gerhard Rieger and contributors (see file CHANGES)
 
 Operating systems:
 
diff --git a/error.c b/error.c
index e5ae1e1..9e37f33 100644
--- a/error.c
+++ b/error.c
@@ -1,5 +1,5 @@
 /* source: error.c */
-/* Copyright Gerhard Rieger */
+/* Copyright Gerhard Rieger and contributors (see file CHANGES) */
 /* Published under the GNU General Public License V.2, see file COPYING */
 
 /* the logging subsystem */
diff --git a/error.h b/error.h
index 0c5f2c4..e743a3a 100644
--- a/error.h
+++ b/error.h
@@ -1,5 +1,5 @@
 /* source: error.h */
-/* Copyright Gerhard Rieger */
+/* Copyright Gerhard Rieger and contributors (see file CHANGES) */
 /* Published under the GNU General Public License V.2, see file COPYING */
 
 #ifndef __error_h_included
diff --git a/fdname.c b/fdname.c
index 8542a2b..c523efd 100644
--- a/fdname.c
+++ b/fdname.c
@@ -1,5 +1,5 @@
 /* source: fdname.c */
-/* Copyright Gerhard Rieger 2003-2011 */
+/* Copyright Gerhard Rieger and contributors (see file CHANGES) */
 /* Published under the GNU General Public License V.2, see file COPYING */
 
 /* the subroutine sockname prints the basic info about the address of a socket
diff --git a/filan.c b/filan.c
index b64ee5c..4cfa3b9 100644
--- a/filan.c
+++ b/filan.c
@@ -1,5 +1,5 @@
 /* source: filan.c */
-/* Copyright Gerhard Rieger */
+/* Copyright Gerhard Rieger and contributors (see file CHANGES) */
 /* Published under the GNU General Public License V.2, see file COPYING */
 
 /* the subroutine filan makes a "FILe descriptor ANalysis". It checks the
diff --git a/filan.h b/filan.h
index bea30f4..15c5f2f 100644
--- a/filan.h
+++ b/filan.h
@@ -1,5 +1,5 @@
 /* source: filan.h */
-/* Copyright Gerhard Rieger 2001-2008 */
+/* Copyright Gerhard Rieger and contributors (see file CHANGES) */
 
 /* Published under the GNU General Public License V.2, see file COPYING */
 
diff --git a/filan_main.c b/filan_main.c
index 6bfb297..dc0c0e8 100644
--- a/filan_main.c
+++ b/filan_main.c
@@ -1,8 +1,8 @@
 /* source: filan_main.c */
-/* Copyright Gerhard Rieger */
+/* Copyright Gerhard Rieger and contributors (see file CHANGES) */
 /* Published under the GNU General Public License V.2, see file COPYING */
 
-const char copyright[] = "filan by Gerhard Rieger - see http://www.dest-unreach.org/socat/";
+const char copyright[] = "filan by Gerhard Rieger and contributors - see http://www.dest-unreach.org/socat/";
 
 #include "config.h"
 #include "xioconfig.h"
diff --git a/ftp.sh b/ftp.sh
index 9eb601a..a7474d2 100755
--- a/ftp.sh
+++ b/ftp.sh
@@ -1,6 +1,6 @@
 #! /bin/sh
 # source: ftp.sh
-# Copyright Gerhard Rieger 2001-2006
+# Copyright Gerhard Rieger and contributors (see file CHANGES)
 # Published under the GNU General Public License V.2, see file COPYING
 
 # example how to write a shell script that communicates with stdio on the front
diff --git a/gatherinfo.sh b/gatherinfo.sh
index d5f540e..7c59eab 100755
--- a/gatherinfo.sh
+++ b/gatherinfo.sh
@@ -1,6 +1,6 @@
 #! /bin/sh
 # source: gatherinfo.sh
-# Copyright Gerhard Rieger 2001, 2002
+# Copyright Gerhard Rieger and contributors (see file CHANGES)
 # Published under the GNU General Public License V.2, see file COPYING
 
 #set -vx
diff --git a/hostan.c b/hostan.c
index 341249f..cce94fe 100644
--- a/hostan.c
+++ b/hostan.c
@@ -1,5 +1,5 @@
 /* source: hostan.c */
-/* Copyright Gerhard Rieger */
+/* Copyright Gerhard Rieger and contributors (see file CHANGES) */
 /* Published under the GNU General Public License V.2, see file COPYING */
 
 /* the subroutine hostan makes a "HOST ANalysis". It gathers information
diff --git a/hostan.h b/hostan.h
index 88844b4..e3a1a1d 100644
--- a/hostan.h
+++ b/hostan.h
@@ -1,5 +1,5 @@
 /* source: hostan.h */
-/* Copyright Gerhard Rieger 2006 */
+/* Copyright Gerhard Rieger and contributors (see file CHANGES) */
 /* Published under the GNU General Public License V.2, see file COPYING */
 
 #ifndef __hostan_h_included
diff --git a/mail.sh b/mail.sh
index 7bc2c5e..f56d251 100755
--- a/mail.sh
+++ b/mail.sh
@@ -1,6 +1,6 @@
 #! /bin/sh
 # source: mail.sh
-# Copyright Gerhard Rieger 2001-2009
+# Copyright Gerhard Rieger and contributors (see file CHANGES)
 # Published under the GNU General Public License V.2, see file COPYING
 
 #set -vx
diff --git a/mytypes.h b/mytypes.h
index 23193d5..f1b73f8 100644
--- a/mytypes.h
+++ b/mytypes.h
@@ -1,5 +1,5 @@
 /* source: mytypes.h */
-/* Copyright Gerhard Rieger */
+/* Copyright Gerhard Rieger and contributors (see file CHANGES) */
 /* Published under the GNU General Public License V.2, see file COPYING */
 
 #ifndef __mytypes_h_included
diff --git a/nestlex.c b/nestlex.c
index f4a8962..329c162 100644
--- a/nestlex.c
+++ b/nestlex.c
@@ -1,5 +1,5 @@
 /* source: nestlex.c */
-/* Copyright Gerhard Rieger */
+/* Copyright Gerhard Rieger and contributors (see file CHANGES) */
 /* Published under the GNU General Public License V.2, see file COPYING */
 
 /* a function for lexical scanning of nested character patterns */
diff --git a/nestlex.h b/nestlex.h
index 8281ef3..c125ace 100644
--- a/nestlex.h
+++ b/nestlex.h
@@ -1,5 +1,5 @@
 /* source: nestlex.h */
-/* Copyright Gerhard Rieger */
+/* Copyright Gerhard Rieger and contributors (see file CHANGES) */
 /* Published under the GNU General Public License V.2, see file COPYING */
 
 #ifndef __nestlex_h_included
diff --git a/procan-cdefs.c b/procan-cdefs.c
index a592e21..57550df 100644
--- a/procan-cdefs.c
+++ b/procan-cdefs.c
@@ -1,5 +1,5 @@
 /* source: procan-cdefs.c */
-/* Copyright Gerhard Rieger */
+/* Copyright Gerhard Rieger and contributors (see file CHANGES) */
 /* Published under the GNU General Public License V.2, see file COPYING */
 
 /* a function that prints compile time parameters */
diff --git a/procan.c b/procan.c
index 4d4c609..03fe13f 100644
--- a/procan.c
+++ b/procan.c
@@ -1,5 +1,5 @@
 /* source: procan.c */
-/* Copyright Gerhard Rieger */
+/* Copyright Gerhard Rieger and contributors (see file CHANGES) */
 /* Published under the GNU General Public License V.2, see file COPYING */
 
 /* the subroutine procan makes a "PROCess ANalysis". It gathers information
diff --git a/procan.h b/procan.h
index 4fd8e06..7d52cdd 100644
--- a/procan.h
+++ b/procan.h
@@ -1,5 +1,5 @@
 /* source: procan.h */
-/* Copyright Gerhard Rieger 2001-2008 */
+/* Copyright Gerhard Rieger and contributors (see file CHANGES) */
 /* Published under the GNU General Public License V.2, see file COPYING */
 
 #ifndef __procan_h_included
diff --git a/procan_main.c b/procan_main.c
index edff24a..7f70402 100644
--- a/procan_main.c
+++ b/procan_main.c
@@ -1,8 +1,8 @@
 /* source: procan_main.c */
-/* Copyright Gerhard Rieger */
+/* Copyright Gerhard Rieger and contributors (see file CHANGES) */
 /* Published under the GNU General Public License V.2, see file COPYING */
 
-const char copyright[] = "procan by Gerhard Rieger - send bug reports to socat@dest-unreach.org";
+const char copyright[] = "procan by Gerhard Rieger and contributors - send bug reports to socat@dest-unreach.org";
 
 #include <signal.h>	/* sig_atomic_t for error.h */
 #include <time.h>	/* struct timespec for error.h */
diff --git a/proxy.sh b/proxy.sh
index 521d192..230e298 100755
--- a/proxy.sh
+++ b/proxy.sh
@@ -1,6 +1,6 @@
 #! /bin/bash
 # source: proxy.sh
-# Copyright Gerhard Rieger 2003-2004
+# Copyright Gerhard Rieger and contributors (see file CHANGES)
 # Published under the GNU General Public License V.2, see file COPYING
 
 # perform primitive simulation of a proxy server.
diff --git a/proxyecho.sh b/proxyecho.sh
index 4644b89..05acab4 100755
--- a/proxyecho.sh
+++ b/proxyecho.sh
@@ -1,6 +1,6 @@
 #! /bin/bash
 # source: proxyecho.sh
-# Copyright Gerhard Rieger 2003-2009
+# Copyright Gerhard Rieger and contributors (see file CHANGES)
 # Published under the GNU General Public License V.2, see file COPYING
 
 # perform primitive simulation of a proxy server with echo function via stdio.
diff --git a/readline-test.sh b/readline-test.sh
index 2242ea9..7547794 100755
--- a/readline-test.sh
+++ b/readline-test.sh
@@ -1,6 +1,6 @@
 #! /bin/bash
 # source: readline-test.sh
-# Copyright Gerhard Rieger 2003-2008
+# Copyright Gerhard Rieger and contributors (see file CHANGES)
 # Published under the GNU General Public License V.2, see file COPYING
 
 # script that simulates a simple program with authentication.
diff --git a/readline.sh b/readline.sh
index fda7ea6..d377716 100755
--- a/readline.sh
+++ b/readline.sh
@@ -1,6 +1,6 @@
 #! /bin/bash
 # source: readline.sh
-# Copyright Gerhard Rieger 2003-2004
+# Copyright Gerhard Rieger and contributors (see file CHANGES)
 # Published under the GNU General Public License V.2, see file COPYING
 
 # this is an attempt for a socat based readline wrapper
diff --git a/snprinterr.c b/snprinterr.c
index c064e56..d994bc1 100644
--- a/snprinterr.c
+++ b/snprinterr.c
@@ -1,5 +1,5 @@
 /* snprinterr.c */
-/* Copyright Gerhard Rieger */
+/* Copyright Gerhard Rieger and contributors (see file CHANGES) */
 
 /* a function similar to vsnprintf() but it just handles %m */
 
diff --git a/snprinterr.h b/snprinterr.h
index 1fc72ed..29d7c1e 100644
--- a/snprinterr.h
+++ b/snprinterr.h
@@ -1,5 +1,5 @@
 /* source: snprinterr.h */
-/* Copyright Gerhard Rieger */
+/* Copyright Gerhard Rieger and contributors (see file CHANGES) */
 /* Published under the GNU General Public License V.2, see file COPYING */
 
 #ifndef __snprinterr_h_included
diff --git a/socat.c b/socat.c
index 8cb6767..09039ff 100644
--- a/socat.c
+++ b/socat.c
@@ -1,5 +1,5 @@
 /* source: socat.c */
-/* Copyright Gerhard Rieger */
+/* Copyright Gerhard Rieger and contributors (see file CHANGES) */
 /* Published under the GNU General Public License V.2, see file COPYING */
 
 /* this is the main source, including command line option parsing, general
@@ -72,7 +72,7 @@ static const char socatversion[] =
       ;
 static const char timestamp[] = BUILD_DATE;
 
-const char copyright_socat[] = "socat by Gerhard Rieger - see www.dest-unreach.org";
+const char copyright_socat[] = "socat by Gerhard Rieger and contributors - see www.dest-unreach.org";
 #if WITH_OPENSSL
 const char copyright_openssl[] = "This product includes software developed by the OpenSSL Project for use in the OpenSSL Toolkit. (http://www.openssl.org/)";
 const char copyright_ssleay[] = "This product includes software written by Tim Hudson (tjh@cryptsoft.com)";
diff --git a/socks4a-echo.sh b/socks4a-echo.sh
index 8767e32..499d1c6 100755
--- a/socks4a-echo.sh
+++ b/socks4a-echo.sh
@@ -2,7 +2,7 @@
 # source: socks4a-echo.sh
 #set -vx
 
-# Copyright Gerhard Rieger 2004
+# Copyright Gerhard Rieger and contributors (see file CHANGES)
 # Published under the GNU General Public License V.2, see file COPYING
 
 # perform primitive simulation of a socks4a server with echo function via stdio.
diff --git a/socks4echo.sh b/socks4echo.sh
index aa19736..129b02e 100755
--- a/socks4echo.sh
+++ b/socks4echo.sh
@@ -1,7 +1,7 @@
 #! /bin/bash
 # source: socks4echo.sh
 
-# Copyright Gerhard Rieger 2004-2006
+# Copyright Gerhard Rieger and contributors (see file CHANGES)
 # Published under the GNU General Public License V.2, see file COPYING
 
 # perform primitive simulation of a socks4 server with echo function via stdio.
diff --git a/sslcls.c b/sslcls.c
index 6ddc077..3d5792a 100644
--- a/sslcls.c
+++ b/sslcls.c
@@ -1,5 +1,5 @@
 /* source: sslcls.c */
-/* Copyright Gerhard Rieger */
+/* Copyright Gerhard Rieger and contributors (see file CHANGES) */
 /* Published under the GNU General Public License V.2, see file COPYING */
 
 /* explicit system call and C library trace function, for those who miss strace
diff --git a/sslcls.h b/sslcls.h
index aece28a..e3ce9f7 100644
--- a/sslcls.h
+++ b/sslcls.h
@@ -1,5 +1,5 @@
 /* source: sslcls.h */
-/* Copyright Gerhard Rieger */
+/* Copyright Gerhard Rieger and contributors (see file CHANGES) */
 /* Published under the GNU General Public License V.2, see file COPYING */
 
 #ifndef __sslcls_h_included
diff --git a/sycls.c b/sycls.c
index c87237d..6e6b592 100644
--- a/sycls.c
+++ b/sycls.c
@@ -1,5 +1,5 @@
 /* source: sycls.c */
-/* Copyright Gerhard Rieger */
+/* Copyright Gerhard Rieger and contributors (see file CHANGES) */
 /* Published under the GNU General Public License V.2, see file COPYING */
 
 /* explicit system call and C library trace function, for those who miss strace
diff --git a/sycls.h b/sycls.h
index e68babf..afa7875 100644
--- a/sycls.h
+++ b/sycls.h
@@ -1,5 +1,5 @@
 /* source: sycls.h */
-/* Copyright Gerhard Rieger */
+/* Copyright Gerhard Rieger and contributors (see file CHANGES) */
 /* Published under the GNU General Public License V.2, see file COPYING */
 
 #ifndef __sycls_h_included
diff --git a/sysincludes.h b/sysincludes.h
index 094a118..dfc86ca 100644
--- a/sysincludes.h
+++ b/sysincludes.h
@@ -1,5 +1,5 @@
 /* source: sysincludes.h */
-/* Copyright Gerhard Rieger */
+/* Copyright Gerhard Rieger and contributors (see file CHANGES) */
 /* Published under the GNU General Public License V.2, see file COPYING */
 
 #ifndef __sysincludes_h_included
diff --git a/sysutils.c b/sysutils.c
index 969d02c..87f1d52 100644
--- a/sysutils.c
+++ b/sysutils.c
@@ -1,5 +1,5 @@
 /* source: sysutils.c */
-/* Copyright Gerhard Rieger */
+/* Copyright Gerhard Rieger and contributors (see file CHANGES) */
 /* Published under the GNU General Public License V.2, see file COPYING */
 
 /* translate socket addresses into human readable form */
diff --git a/sysutils.h b/sysutils.h
index 906aa59..6a37e3f 100644
--- a/sysutils.h
+++ b/sysutils.h
@@ -1,5 +1,5 @@
 /* source: sysutils.h */
-/* Copyright Gerhard Rieger */
+/* Copyright Gerhard Rieger and contributors (see file CHANGES) */
 /* Published under the GNU General Public License V.2, see file COPYING */
 
 #ifndef __sysutils_h_included
diff --git a/test.sh b/test.sh
index e26ba4d..5c746c9 100755
--- a/test.sh
+++ b/test.sh
@@ -1,6 +1,6 @@
 #! /bin/bash
 # source: test.sh
-# Copyright Gerhard Rieger
+# Copyright Gerhard Rieger and contributors (see file CHANGES)
 # Published under the GNU General Public License V.2, see file COPYING
 
 # perform lots of tests on socat
diff --git a/utils.c b/utils.c
index 6e3805c..6a61e5b 100644
--- a/utils.c
+++ b/utils.c
@@ -1,5 +1,5 @@
 /* source: utils.c */
-/* Copyright Gerhard Rieger */
+/* Copyright Gerhard Rieger and contributors (see file CHANGES) */
 /* Published under the GNU General Public License V.2, see file COPYING */
 
 /* useful additions to C library */
diff --git a/utils.h b/utils.h
index 46ff9be..d1ff71c 100644
--- a/utils.h
+++ b/utils.h
@@ -1,5 +1,5 @@
 /* source: utils.h */
-/* Copyright Gerhard Rieger */
+/* Copyright Gerhard Rieger and contributors (see file CHANGES) */
 /* Published under the GNU General Public License V.2, see file COPYING */
 
 #ifndef __utils_h_included
diff --git a/vsnprintf_r.c b/vsnprintf_r.c
index 473ddba..03db71b 100644
--- a/vsnprintf_r.c
+++ b/vsnprintf_r.c
@@ -1,5 +1,5 @@
 /* vsnprintf_r.c */
-/* Copyright Gerhard Rieger */
+/* Copyright Gerhard Rieger and contributors (see file CHANGES) */
 
 /* a reduced but async-signal-safe and thread-safe version of vsnprintf */
 
diff --git a/vsnprintf_r.h b/vsnprintf_r.h
index ac17e0f..5e72f46 100644
--- a/vsnprintf_r.h
+++ b/vsnprintf_r.h
@@ -1,5 +1,5 @@
 /* source: vsnprintf_r.h */
-/* Copyright Gerhard Rieger */
+/* Copyright Gerhard Rieger and contributors (see file CHANGES) */
 /* Published under the GNU General Public License V.2, see file COPYING */
 
 #ifndef __vsnprintf_r_h_included
diff --git a/xio-ascii.c b/xio-ascii.c
index 4c0cb4b..2fb61b9 100644
--- a/xio-ascii.c
+++ b/xio-ascii.c
@@ -1,5 +1,5 @@
 /* source: xio-ascii.c */
-/* Copyright Gerhard Rieger */
+/* Copyright Gerhard Rieger and contributors (see file CHANGES) */
 /* Published under the GNU General Public License V.2, see file COPYING */
 
 /* this file contains functions for text encoding, decoding, and conversions */
diff --git a/xio-ascii.h b/xio-ascii.h
index bcb760f..53449f7 100644
--- a/xio-ascii.h
+++ b/xio-ascii.h
@@ -1,5 +1,5 @@
 /* source: xio-ascii.h */
-/* Copyright Gerhard Rieger 2002-2008 */
+/* Copyright Gerhard Rieger and contributors (see file CHANGES) */
 /* Published under the GNU General Public License V.2, see file COPYING */
 
 #ifndef __xio_ascii_h_included
diff --git a/xio-creat.c b/xio-creat.c
index 800d83e..ed98f0c 100644
--- a/xio-creat.c
+++ b/xio-creat.c
@@ -1,5 +1,5 @@
 /* source: xio-creat.c */
-/* Copyright Gerhard Rieger 2001-2006 */
+/* Copyright Gerhard Rieger and contributors (see file CHANGES) */
 /* Published under the GNU General Public License V.2, see file COPYING */
 
 /* this file contains the source for opening addresses of create type */
diff --git a/xio-creat.h b/xio-creat.h
index 1900f1b..2718262 100644
--- a/xio-creat.h
+++ b/xio-creat.h
@@ -1,5 +1,5 @@
 /* source: xio-creat.h */
-/* Copyright Gerhard Rieger 2001 */
+/* Copyright Gerhard Rieger and contributors (see file CHANGES) */
 /* Published under the GNU General Public License V.2, see file COPYING */
 
 #ifndef __xio_creat_h_included
diff --git a/xio-exec.c b/xio-exec.c
index 1b1c8d5..c73faf8 100644
--- a/xio-exec.c
+++ b/xio-exec.c
@@ -1,5 +1,5 @@
 /* source: xio-exec.c */
-/* Copyright Gerhard Rieger 2001-2011 */
+/* Copyright Gerhard Rieger and contributors (see file CHANGES) */
 /* Published under the GNU General Public License V.2, see file COPYING */
 
 /* this file contains the source for opening addresses of exec type */
diff --git a/xio-exec.h b/xio-exec.h
index 9594b01..221eeb2 100644
--- a/xio-exec.h
+++ b/xio-exec.h
@@ -1,5 +1,5 @@
 /* source: xio-exec.h */
-/* Copyright Gerhard Rieger 2001, 2002 */
+/* Copyright Gerhard Rieger and contributors (see file CHANGES) */
 /* Published under the GNU General Public License V.2, see file COPYING */
 
 #ifndef __xio_exec_h_included
diff --git a/xio-ext2.c b/xio-ext2.c
index 46229b3..1f10125 100644
--- a/xio-ext2.c
+++ b/xio-ext2.c
@@ -1,5 +1,5 @@
 /* source: xio-ext2.c */
-/* Copyright Gerhard Rieger 2005-2006 */
+/* Copyright Gerhard Rieger and contributors (see file CHANGES) */
 /* Published under the GNU General Public License V.2, see file COPYING */
 
 /* this file contains the source for handling Linux ext2fs options
diff --git a/xio-ext2.h b/xio-ext2.h
index 02d18a4..a4c32f2 100644
--- a/xio-ext2.h
+++ b/xio-ext2.h
@@ -1,5 +1,5 @@
 /* source: xio-ext2.h */
-/* Copyright Gerhard Rieger 2006 */
+/* Copyright Gerhard Rieger and contributors (see file CHANGES) */
 /* Published under the GNU General Public License V.2, see file COPYING */
 
 #ifndef __xio_ext2_h_included
diff --git a/xio-fd.c b/xio-fd.c
index 69b848a..53ad1a0 100644
--- a/xio-fd.c
+++ b/xio-fd.c
@@ -1,5 +1,5 @@
 /* source: xio-fd.c */
-/* Copyright Gerhard Rieger 2001-2009 */
+/* Copyright Gerhard Rieger and contributors (see file CHANGES) */
 /* Published under the GNU General Public License V.2, see file COPYING */
 
 /* this file contains common file descriptor related option definitions */
diff --git a/xio-fd.h b/xio-fd.h
index 4b74b55..55ac0eb 100644
--- a/xio-fd.h
+++ b/xio-fd.h
@@ -1,5 +1,5 @@
 /* source: xio-fd.h */
-/* Copyright Gerhard Rieger 2001-2009 */
+/* Copyright Gerhard Rieger and contributors (see file CHANGES) */
 /* Published under the GNU General Public License V.2, see file COPYING */
 
 #ifndef __xio_fd_h_included
diff --git a/xio-fdnum.c b/xio-fdnum.c
index 774bd14..15564ec 100644
--- a/xio-fdnum.c
+++ b/xio-fdnum.c
@@ -1,5 +1,5 @@
 /* source: xio-fdnum.c */
-/* Copyright Gerhard Rieger 2001-2006 */
+/* Copyright Gerhard Rieger and contributors (see file CHANGES) */
 /* Published under the GNU General Public License V.2, see file COPYING */
 
 /* this file contains the source for opening addresses of fdnum type */
diff --git a/xio-fdnum.h b/xio-fdnum.h
index 5521f7e..baf89aa 100644
--- a/xio-fdnum.h
+++ b/xio-fdnum.h
@@ -1,5 +1,5 @@
 /* source: xio-fdnum.h */
-/* Copyright Gerhard Rieger 2001-2006 */
+/* Copyright Gerhard Rieger and contributors (see file CHANGES) */
 /* Published under the GNU General Public License V.2, see file COPYING */
 
 #ifndef __xio_fdnum_h_included
diff --git a/xio-file.c b/xio-file.c
index c89d956..4f4648b 100644
--- a/xio-file.c
+++ b/xio-file.c
@@ -1,5 +1,5 @@
 /* source: xio-file.c */
-/* Copyright Gerhard Rieger 2001-2007 */
+/* Copyright Gerhard Rieger and contributors (see file CHANGES) */
 /* Published under the GNU General Public License V.2, see file COPYING */
 
 /* this file contains the source for opening addresses of open type */
diff --git a/xio-file.h b/xio-file.h
index ebd8763..c52b668 100644
--- a/xio-file.h
+++ b/xio-file.h
@@ -1,5 +1,5 @@
 /* source: xio-file.h */
-/* Copyright Gerhard Rieger 2001-2006 */
+/* Copyright Gerhard Rieger and contributors (see file CHANGES) */
 /* Published under the GNU General Public License V.2, see file COPYING */
 
 #ifndef __xio_file_h_included
diff --git a/xio-gopen.c b/xio-gopen.c
index a4e2dec..c193baa 100644
--- a/xio-gopen.c
+++ b/xio-gopen.c
@@ -1,5 +1,5 @@
 /* source: xio-gopen.c */
-/* Copyright Gerhard Rieger 2001-2010 */
+/* Copyright Gerhard Rieger and contributors (see file CHANGES) */
 /* Published under the GNU General Public License V.2, see file COPYING */
 
 /* this file contains the source for opening addresses of generic open type */
diff --git a/xio-gopen.h b/xio-gopen.h
index 0a6ff20..6c5e8e7 100644
--- a/xio-gopen.h
+++ b/xio-gopen.h
@@ -1,5 +1,5 @@
 /* source: xio-gopen.h */
-/* Copyright Gerhard Rieger 2001 */
+/* Copyright Gerhard Rieger and contributors (see file CHANGES) */
 /* Published under the GNU General Public License V.2, see file COPYING */
 
 #ifndef __xio_gopen_h_included
diff --git a/xio-interface.c b/xio-interface.c
index d6e7f69..ee20186 100644
--- a/xio-interface.c
+++ b/xio-interface.c
@@ -1,5 +1,5 @@
 /* source: xio-interface.c */
-/* Copyright Gerhard Rieger 2010 */
+/* Copyright Gerhard Rieger and contributors (see file CHANGES) */
 /* Published under the GNU General Public License V.2, see file COPYING */
 
 /* this file contains the source for opening addresses of raw socket type */
diff --git a/xio-interface.h b/xio-interface.h
index c7ed866..286341b 100644
--- a/xio-interface.h
+++ b/xio-interface.h
@@ -1,5 +1,5 @@
 /* source: xio-interface.h */
-/* Copyright Gerhard Rieger 2008 */
+/* Copyright Gerhard Rieger and contributors (see file CHANGES) */
 /* Published under the GNU General Public License V.2, see file COPYING */
 
 #ifndef __xio_interface_h_included
diff --git a/xio-ip.c b/xio-ip.c
index 0c9141d..749c7a4 100644
--- a/xio-ip.c
+++ b/xio-ip.c
@@ -1,5 +1,5 @@
 /* source: xio-ip.c */
-/* Copyright Gerhard Rieger */
+/* Copyright Gerhard Rieger and contributors (see file CHANGES) */
 /* Published under the GNU General Public License V.2, see file COPYING */
 
 /* this file contains the source for IP related functions */
diff --git a/xio-ip.h b/xio-ip.h
index 5ec9ff6..eb744d8 100644
--- a/xio-ip.h
+++ b/xio-ip.h
@@ -1,5 +1,5 @@
 /* source: xio-ip.h */
-/* Copyright Gerhard Rieger 2001-2008 */
+/* Copyright Gerhard Rieger and contributors (see file CHANGES) */
 /* Published under the GNU General Public License V.2, see file COPYING */
 
 #ifndef __xio_ip_h_included
diff --git a/xio-ip4.c b/xio-ip4.c
index 73d7d7a..8bad5fc 100644
--- a/xio-ip4.c
+++ b/xio-ip4.c
@@ -1,5 +1,5 @@
 /* source: xio-ip4.c */
-/* Copyright Gerhard Rieger */
+/* Copyright Gerhard Rieger and contributors (see file CHANGES) */
 /* Published under the GNU General Public License V.2, see file COPYING */
 
 /* this file contains the source for IP4 related functions */
diff --git a/xio-ip4.h b/xio-ip4.h
index 2bd11ce..5d4e277 100644
--- a/xio-ip4.h
+++ b/xio-ip4.h
@@ -1,5 +1,5 @@
 /* source: xio-ip4.h */
-/* Copyright Gerhard Rieger 2001-2008 */
+/* Copyright Gerhard Rieger and contributors (see file CHANGES) */
 /* Published under the GNU General Public License V.2, see file COPYING */
 
 #ifndef __xio_ip4_h_included
diff --git a/xio-ip6.c b/xio-ip6.c
index 2e5c629..b24ef34 100644
--- a/xio-ip6.c
+++ b/xio-ip6.c
@@ -1,5 +1,5 @@
 /* source: xio-ip6.c */
-/* Copyright Gerhard Rieger */
+/* Copyright Gerhard Rieger and contributors (see file CHANGES) */
 /* Published under the GNU General Public License V.2, see file COPYING */
 
 /* this file contains the source for IP6 related functions */
diff --git a/xio-ip6.h b/xio-ip6.h
index c0203ff..905ca08 100644
--- a/xio-ip6.h
+++ b/xio-ip6.h
@@ -1,5 +1,5 @@
 /* source: xio-ip6.h */
-/* Copyright Gerhard Rieger 2001-2008 */
+/* Copyright Gerhard Rieger and contributors (see file CHANGES) */
 /* Published under the GNU General Public License V.2, see file COPYING */
 
 #ifndef __xio_ip6_h_included
diff --git a/xio-ipapp.c b/xio-ipapp.c
index eeb18f1..8a0f057 100644
--- a/xio-ipapp.c
+++ b/xio-ipapp.c
@@ -1,5 +1,5 @@
 /* source: xio-ipapp.c */
-/* Copyright Gerhard Rieger */
+/* Copyright Gerhard Rieger and contributors (see file CHANGES) */
 /* Published under the GNU General Public License V.2, see file COPYING */
 
 /* this file contains the source for TCP and UDP related options */
diff --git a/xio-ipapp.h b/xio-ipapp.h
index c2dcb1e..e4ed9a9 100644
--- a/xio-ipapp.h
+++ b/xio-ipapp.h
@@ -1,5 +1,5 @@
 /* source: xio-ipapp.h */
-/* Copyright Gerhard Rieger 2001-2008 */
+/* Copyright Gerhard Rieger and contributors (see file CHANGES) */
 /* Published under the GNU General Public License V.2, see file COPYING */
 
 #ifndef __xio_ipapp_h_included
diff --git a/xio-listen.c b/xio-listen.c
index 11a6b9a..29c981b 100644
--- a/xio-listen.c
+++ b/xio-listen.c
@@ -1,5 +1,5 @@
 /* source: xio-listen.c */
-/* Copyright Gerhard Rieger */
+/* Copyright Gerhard Rieger and contributors (see file CHANGES) */
 /* Published under the GNU General Public License V.2, see file COPYING */
 
 /* this file contains the source for listen socket options */
diff --git a/xio-listen.h b/xio-listen.h
index 1c4a66d..3e61fa5 100644
--- a/xio-listen.h
+++ b/xio-listen.h
@@ -1,5 +1,5 @@
 /* source: xio-listen.h */
-/* Copyright Gerhard Rieger 2001-2011 */
+/* Copyright Gerhard Rieger and contributors (see file CHANGES) */
 /* Published under the GNU General Public License V.2, see file COPYING */
 
 #ifndef __xio_listen_h_included
diff --git a/xio-named.c b/xio-named.c
index fbb9f68..4dcb327 100644
--- a/xio-named.c
+++ b/xio-named.c
@@ -1,5 +1,5 @@
 /* source: xio-named.c */
-/* Copyright Gerhard Rieger */
+/* Copyright Gerhard Rieger and contributors (see file CHANGES) */
 /* Published under the GNU General Public License V.2, see file COPYING */
 
 /* this file contains the source for filesystem entry functions */
diff --git a/xio-named.h b/xio-named.h
index 87dda76..167da7c 100644
--- a/xio-named.h
+++ b/xio-named.h
@@ -1,5 +1,5 @@
 /* source: xio-named.h */
-/* Copyright Gerhard Rieger 2001-2006 */
+/* Copyright Gerhard Rieger and contributors (see file CHANGES) */
 /* Published under the GNU General Public License V.2, see file COPYING */
 
 #ifndef __xio_named_h_included
diff --git a/xio-openssl.c b/xio-openssl.c
index b7e95c1..cf0ec49 100644
--- a/xio-openssl.c
+++ b/xio-openssl.c
@@ -1,5 +1,5 @@
 /* source: xio-openssl.c */
-/* Copyright Gerhard Rieger */
+/* Copyright Gerhard Rieger and contributors (see file CHANGES) */
 /* Published under the GNU General Public License V.2, see file COPYING */
 
 /* this file contains the implementation of the openssl addresses */
diff --git a/xio-openssl.h b/xio-openssl.h
index 9cad8f4..ca47233 100644
--- a/xio-openssl.h
+++ b/xio-openssl.h
@@ -1,5 +1,5 @@
 /* source: xio-openssl.h */
-/* Copyright Gerhard Rieger */
+/* Copyright Gerhard Rieger and contributors (see file CHANGES) */
 /* Published under the GNU General Public License V.2, see file COPYING */
 
 #ifndef __xio_openssl_included
diff --git a/xio-pipe.c b/xio-pipe.c
index 3e6a117..14e19f3 100644
--- a/xio-pipe.c
+++ b/xio-pipe.c
@@ -1,5 +1,5 @@
 /* source: xio-pipe.c */
-/* Copyright Gerhard Rieger */
+/* Copyright Gerhard Rieger and contributors (see file CHANGES) */
 /* Published under the GNU General Public License V.2, see file COPYING */
 
 /* this file contains the source for opening addresses of pipe type */
diff --git a/xio-pipe.h b/xio-pipe.h
index 7db0633..7e8fe5e 100644
--- a/xio-pipe.h
+++ b/xio-pipe.h
@@ -1,5 +1,5 @@
 /* source: xio-pipe.h */
-/* Copyright Gerhard Rieger 2001 */
+/* Copyright Gerhard Rieger and contributors (see file CHANGES) */
 /* Published under the GNU General Public License V.2, see file COPYING */
 
 #ifndef __xio_pipe_h_included
diff --git a/xio-process.c b/xio-process.c
index ca34eea..b43a480 100644
--- a/xio-process.c
+++ b/xio-process.c
@@ -1,5 +1,5 @@
 /* source: xio-process.c */
-/* Copyright Gerhard Rieger */
+/* Copyright Gerhard Rieger and contributors (see file CHANGES) */
 /* Published under the GNU General Public License V.2, see file COPYING */
 
 /* this file handles process related addresses options */
diff --git a/xio-process.h b/xio-process.h
index 7a6815f..675384d 100644
--- a/xio-process.h
+++ b/xio-process.h
@@ -1,5 +1,5 @@
 /* source: xio-process.h */
-/* Copyright Gerhard Rieger */
+/* Copyright Gerhard Rieger and contributors (see file CHANGES) */
 /* Published under the GNU General Public License V.2, see file COPYING */
 
 #ifndef __xio_process_h_included
diff --git a/xio-progcall.c b/xio-progcall.c
index 9b2c7fa..1ad91b0 100644
--- a/xio-progcall.c
+++ b/xio-progcall.c
@@ -1,5 +1,5 @@
 /* source: xio-progcall.c */
-/* Copyright Gerhard Rieger */
+/* Copyright Gerhard Rieger and contributors (see file CHANGES) */
 /* Published under the GNU General Public License V.2, see file COPYING */
 
 /* this file contains common code dealing with program calls (exec, system) */
diff --git a/xio-progcall.h b/xio-progcall.h
index 706331f..cd06bdb 100644
--- a/xio-progcall.h
+++ b/xio-progcall.h
@@ -1,5 +1,5 @@
 /* source: xio-progcall.h */
-/* Copyright Gerhard Rieger 2001-2008 */
+/* Copyright Gerhard Rieger and contributors (see file CHANGES) */
 /* Published under the GNU General Public License V.2, see file COPYING */
 
 #ifndef __xio_progcall_h_included
diff --git a/xio-proxy.c b/xio-proxy.c
index 63582cc..bde0990 100644
--- a/xio-proxy.c
+++ b/xio-proxy.c
@@ -1,5 +1,5 @@
 /* source: xio-proxy.c */
-/* Copyright Gerhard Rieger */
+/* Copyright Gerhard Rieger and contributors (see file CHANGES) */
 /* Published under the GNU General Public License V.2, see file COPYING */
 
 /* this file contains the source for opening addresses of HTTP proxy CONNECT
diff --git a/xio-proxy.h b/xio-proxy.h
index 05847a0..85729aa 100644
--- a/xio-proxy.h
+++ b/xio-proxy.h
@@ -1,5 +1,5 @@
 /* source: xio-proxy.h */
-/* Copyright Gerhard Rieger 2002-2006 */
+/* Copyright Gerhard Rieger and contributors (see file CHANGES) */
 /* Published under the GNU General Public License V.2, see file COPYING */
 
 #ifndef __xio_proxy_h_included
diff --git a/xio-pty.c b/xio-pty.c
index 07aeec7..e502f26 100644
--- a/xio-pty.c
+++ b/xio-pty.c
@@ -1,5 +1,5 @@
 /* source: xio-pty.c */
-/* Copyright Gerhard Rieger */
+/* Copyright Gerhard Rieger and contributors (see file CHANGES) */
 /* Published under the GNU General Public License V.2, see file COPYING */
 
 /* this file contains the source for creating pty addresses */
diff --git a/xio-pty.h b/xio-pty.h
index 002d88e..bdc91e3 100644
--- a/xio-pty.h
+++ b/xio-pty.h
@@ -1,5 +1,5 @@
 /* source: xio-pty.h */
-/* Copyright Gerhard Rieger 2002-2004 */
+/* Copyright Gerhard Rieger and contributors (see file CHANGES) */
 /* Published under the GNU General Public License V.2, see file COPYING */
 
 #ifndef __xio_pty_h_included
diff --git a/xio-rawip.c b/xio-rawip.c
index 0cbed31..a53ad15 100644
--- a/xio-rawip.c
+++ b/xio-rawip.c
@@ -1,5 +1,5 @@
 /* source: xio-rawip.c */
-/* Copyright Gerhard Rieger 2001-2008 */
+/* Copyright Gerhard Rieger and contributors (see file CHANGES) */
 /* Published under the GNU General Public License V.2, see file COPYING */
 
 /* this file contains the source for opening addresses of raw IP type */
diff --git a/xio-rawip.h b/xio-rawip.h
index e498e78..e6541e6 100644
--- a/xio-rawip.h
+++ b/xio-rawip.h
@@ -1,5 +1,5 @@
 /* source: xio-rawip.h */
-/* Copyright Gerhard Rieger 2001-2007 */
+/* Copyright Gerhard Rieger and contributors (see file CHANGES) */
 /* Published under the GNU General Public License V.2, see file COPYING */
 
 #ifndef __xio_rawip_h_included
diff --git a/xio-readline.c b/xio-readline.c
index cacb9a7..ee64e6f 100644
--- a/xio-readline.c
+++ b/xio-readline.c
@@ -1,5 +1,5 @@
 /* source: xio-readline.c */
-/* Copyright Gerhard Rieger */
+/* Copyright Gerhard Rieger and contributors (see file CHANGES) */
 /* Published under the GNU General Public License V.2, see file COPYING */
 
 /* this file contains the source for opening the readline address */
diff --git a/xio-readline.h b/xio-readline.h
index fae81b1..bd43b48 100644
--- a/xio-readline.h
+++ b/xio-readline.h
@@ -1,5 +1,5 @@
 /* source: xio-readline.h */
-/* Copyright Gerhard Rieger 2002, 2003 */
+/* Copyright Gerhard Rieger and contributors (see file CHANGES) */
 /* Published under the GNU General Public License V.2, see file COPYING */
 
 #ifndef __xio_readline_h_included
diff --git a/xio-sctp.c b/xio-sctp.c
index bcfec7e..61aee10 100644
--- a/xio-sctp.c
+++ b/xio-sctp.c
@@ -1,5 +1,5 @@
 /* source: xio-sctp.c */
-/* Copyright Gerhard Rieger 2008 */
+/* Copyright Gerhard Rieger and contributors (see file CHANGES) */
 /* Published under the GNU General Public License V.2, see file COPYING */
 
 /* this file contains the source for SCTP related functions and options */
diff --git a/xio-sctp.h b/xio-sctp.h
index de2adb3..c8cc606 100644
--- a/xio-sctp.h
+++ b/xio-sctp.h
@@ -1,5 +1,5 @@
 /* source: xio-sctp.h */
-/* Copyright Gerhard Rieger 2008 */
+/* Copyright Gerhard Rieger and contributors (see file CHANGES) */
 /* Published under the GNU General Public License V.2, see file COPYING */
 
 #ifndef __xio_sctp_h_included
diff --git a/xio-socket.c b/xio-socket.c
index e75bfc1..a9950e9 100644
--- a/xio-socket.c
+++ b/xio-socket.c
@@ -1,5 +1,5 @@
 /* source: xio-socket.c */
-/* Copyright Gerhard Rieger */
+/* Copyright Gerhard Rieger and contributors (see file CHANGES) */
 /* Published under the GNU General Public License V.2, see file COPYING */
 
 /* this file contains the source for socket related functions, and the
diff --git a/xio-socket.h b/xio-socket.h
index a4bef66..9267610 100644
--- a/xio-socket.h
+++ b/xio-socket.h
@@ -1,5 +1,5 @@
 /* source: xio-socket.h */
-/* Copyright Gerhard Rieger 2001-2009 */
+/* Copyright Gerhard Rieger and contributors (see file CHANGES) */
 /* Published under the GNU General Public License V.2, see file COPYING */
 
 #ifndef __xio_socket_h_included
diff --git a/xio-socks.c b/xio-socks.c
index 61a3e43..aa1070e 100644
--- a/xio-socks.c
+++ b/xio-socks.c
@@ -1,5 +1,5 @@
 /* source: xio-socks.c */
-/* Copyright Gerhard Rieger */
+/* Copyright Gerhard Rieger and contributors (see file CHANGES) */
 /* Published under the GNU General Public License V.2, see file COPYING */
 
 /* this file contains the source for opening addresses of socks4 type */
diff --git a/xio-socks.h b/xio-socks.h
index 07902ff..9b948db 100644
--- a/xio-socks.h
+++ b/xio-socks.h
@@ -1,5 +1,5 @@
 /* source: xio-socks.h */
-/* Copyright Gerhard Rieger 2001-2004 */
+/* Copyright Gerhard Rieger and contributors (see file CHANGES) */
 /* Published under the GNU General Public License V.2, see file COPYING */
 
 #ifndef __xio_socks_h_included
diff --git a/xio-stdio.c b/xio-stdio.c
index 73f2b7f..44f375c 100644
--- a/xio-stdio.c
+++ b/xio-stdio.c
@@ -1,5 +1,5 @@
 /* source: xio-stdio.c */
-/* Copyright Gerhard Rieger 2001-2008 */
+/* Copyright Gerhard Rieger and contributors (see file CHANGES) */
 /* Published under the GNU General Public License V.2, see file COPYING */
 
 /* this file contains the source for opening addresses stdio type */
diff --git a/xio-stdio.h b/xio-stdio.h
index b3d6b29..7af87f0 100644
--- a/xio-stdio.h
+++ b/xio-stdio.h
@@ -1,5 +1,5 @@
 /* source: xio-stdio.h */
-/* Copyright Gerhard Rieger 2001-2006 */
+/* Copyright Gerhard Rieger and contributors (see file CHANGES) */
 /* Published under the GNU General Public License V.2, see file COPYING */
 
 #ifndef __xio_stdio_h_included
diff --git a/xio-streams.c b/xio-streams.c
index 910b53e..06be390 100644
--- a/xio-streams.c
+++ b/xio-streams.c
@@ -1,5 +1,5 @@
 /* source: xio-streams.c */
-/* Copyright Gerhard Rieger 2008 */
+/* Copyright Gerhard Rieger and contributors (see file CHANGES) */
 /* Published under the GNU General Public License V.2, see file COPYING */
 
 /* this file contains definitions and functions for handling POSIX STREAMS */
diff --git a/xio-streams.h b/xio-streams.h
index bc1bdbe..3b71a41 100644
--- a/xio-streams.h
+++ b/xio-streams.h
@@ -1,5 +1,5 @@
 /* source: xio-streams.h */
-/* Copyright Gerhard Rieger 2008 */
+/* Copyright Gerhard Rieger and contributors (see file CHANGES) */
 /* Published under the GNU General Public License V.2, see file COPYING */
 
 /* when including this file select one part that you need by defining the
diff --git a/xio-system.c b/xio-system.c
index 721f130..92b7b67 100644
--- a/xio-system.c
+++ b/xio-system.c
@@ -1,5 +1,5 @@
 /* source: xio-system.c */
-/* Copyright Gerhard Rieger */
+/* Copyright Gerhard Rieger and contributors (see file CHANGES) */
 /* Published under the GNU General Public License V.2, see file COPYING */
 
 /* this file contains the source for opening addresses of system type */
diff --git a/xio-system.h b/xio-system.h
index c1c8863..9321bb6 100644
--- a/xio-system.h
+++ b/xio-system.h
@@ -1,5 +1,5 @@
 /* source: xio-system.h */
-/* Copyright Gerhard Rieger 2001 */
+/* Copyright Gerhard Rieger and contributors (see file CHANGES) */
 /* Published under the GNU General Public License V.2, see file COPYING */
 
 #ifndef __xio_system_h_included
diff --git a/xio-tcp.c b/xio-tcp.c
index 651fab4..d81b3a9 100644
--- a/xio-tcp.c
+++ b/xio-tcp.c
@@ -1,5 +1,5 @@
 /* source: xio-tcp.c */
-/* Copyright Gerhard Rieger 2001-2006 */
+/* Copyright Gerhard Rieger and contributors (see file CHANGES) */
 /* Published under the GNU General Public License V.2, see file COPYING */
 
 /* this file contains the source for TCP related functions and options */
diff --git a/xio-tcp.h b/xio-tcp.h
index bbbf846..ff20508 100644
--- a/xio-tcp.h
+++ b/xio-tcp.h
@@ -1,5 +1,5 @@
 /* source: xio-tcp.h */
-/* Copyright Gerhard Rieger 2001-2006 */
+/* Copyright Gerhard Rieger and contributors (see file CHANGES) */
 /* Published under the GNU General Public License V.2, see file COPYING */
 
 #ifndef __xio_tcp_h_included
diff --git a/xio-tcpwrap.c b/xio-tcpwrap.c
index 20d482b..a95e747 100644
--- a/xio-tcpwrap.c
+++ b/xio-tcpwrap.c
@@ -1,5 +1,5 @@
 /* source: xio-tcpwrap.c */
-/* Copyright Gerhard Rieger 2006-2008 */
+/* Copyright Gerhard Rieger and contributors (see file CHANGES) */
 /* Published under the GNU General Public License V.2, see file COPYING */
 
 /* this file contains the source for tcpwrapper handling stuff */
diff --git a/xio-tcpwrap.h b/xio-tcpwrap.h
index 1a715b9..a7fa814 100644
--- a/xio-tcpwrap.h
+++ b/xio-tcpwrap.h
@@ -1,5 +1,5 @@
 /* source: xio-tcpwrap.h */
-/* Copyright Gerhard Rieger 2006 */
+/* Copyright Gerhard Rieger and contributors (see file CHANGES) */
 /* Published under the GNU General Public License V.2, see file COPYING */
 
 #ifndef __xio_tcpwrap_h_included
diff --git a/xio-termios.c b/xio-termios.c
index ce3346c..70f1831 100644
--- a/xio-termios.c
+++ b/xio-termios.c
@@ -1,5 +1,5 @@
 /* source: xio-termios.c */
-/* Copyright Gerhard Rieger */
+/* Copyright Gerhard Rieger and contributors (see file CHANGES) */
 /* Published under the GNU General Public License V.2, see file COPYING */
 
 /* this file contains the source for terminal I/O options */
diff --git a/xio-termios.h b/xio-termios.h
index e661446..8e39839 100644
--- a/xio-termios.h
+++ b/xio-termios.h
@@ -1,5 +1,5 @@
 /* source: xio-termios.h */
-/* Copyright Gerhard Rieger */
+/* Copyright Gerhard Rieger and contributors (see file CHANGES) */
 /* Published under the GNU General Public License V.2, see file COPYING */
 
 #ifndef __xio_termios_h_included
diff --git a/xio-tun.c b/xio-tun.c
index b9521f3..14a4028 100644
--- a/xio-tun.c
+++ b/xio-tun.c
@@ -1,5 +1,5 @@
 /* source: xio-tun.c */
-/* Copyright Gerhard Rieger */
+/* Copyright Gerhard Rieger and contributors (see file CHANGES) */
 /* Published under the GNU General Public License V.2, see file COPYING */
 
 /* this file contains the source for opening addresses of tun/tap type */
diff --git a/xio-tun.h b/xio-tun.h
index 1d503ab..5f73113 100644
--- a/xio-tun.h
+++ b/xio-tun.h
@@ -1,5 +1,5 @@
 /* source: xio-tun.h */
-/* Copyright Gerhard Rieger 2006-2007 */
+/* Copyright Gerhard Rieger and contributors (see file CHANGES) */
 /* Published under the GNU General Public License V.2, see file COPYING */
 
 #ifndef __xio_tun_h_included
diff --git a/xio-udp.c b/xio-udp.c
index 4426d43..d752817 100644
--- a/xio-udp.c
+++ b/xio-udp.c
@@ -1,5 +1,5 @@
 /* source: xio-udp.c */
-/* Copyright Gerhard Rieger */
+/* Copyright Gerhard Rieger and contributors (see file CHANGES) */
 /* Published under the GNU General Public License V.2, see file COPYING */
 
 /* this file contains the source for handling UDP addresses */
diff --git a/xio-udp.h b/xio-udp.h
index 5369d95..d8d1471 100644
--- a/xio-udp.h
+++ b/xio-udp.h
@@ -1,5 +1,5 @@
 /* source: xio-udp.h */
-/* Copyright Gerhard Rieger 2001-2007 */
+/* Copyright Gerhard Rieger and contributors (see file CHANGES) */
 /* Published under the GNU General Public License V.2, see file COPYING */
 
 #ifndef __xio_udp_h_included
diff --git a/xio-unix.c b/xio-unix.c
index fa6634d..2e3c5a5 100644
--- a/xio-unix.c
+++ b/xio-unix.c
@@ -1,5 +1,5 @@
 /* source: xio-unix.c */
-/* Copyright Gerhard Rieger */
+/* Copyright Gerhard Rieger and contributors (see file CHANGES) */
 /* Published under the GNU General Public License V.2, see file COPYING */
 
 /* this file contains the source for opening addresses of UNIX socket type */
diff --git a/xio-unix.h b/xio-unix.h
index 47c5290..3e97f83 100644
--- a/xio-unix.h
+++ b/xio-unix.h
@@ -1,5 +1,5 @@
 /* source: xio-unix.h */
-/* Copyright Gerhard Rieger 2001-2008 */
+/* Copyright Gerhard Rieger and contributors (see file CHANGES) */
 /* Published under the GNU General Public License V.2, see file COPYING */
 
 #ifndef __xio_unix_h_included
diff --git a/xio.h b/xio.h
index a5b6fe4..13f7d5c 100644
--- a/xio.h
+++ b/xio.h
@@ -1,5 +1,5 @@
 /* source: xio.h */
-/* Copyright Gerhard Rieger */
+/* Copyright Gerhard Rieger and contributors (see file CHANGES) */
 /* Published under the GNU General Public License V.2, see file COPYING */
 
 #ifndef __xio_h_included
diff --git a/xioclose.c b/xioclose.c
index 3109f98..b7e168e 100644
--- a/xioclose.c
+++ b/xioclose.c
@@ -1,5 +1,5 @@
 /* source: xioclose.c */
-/* Copyright Gerhard Rieger 2001-2009 */
+/* Copyright Gerhard Rieger and contributors (see file CHANGES) */
 /* Published under the GNU General Public License V.2, see file COPYING */
 
 /* this is the source of the extended close function */
diff --git a/xioconfig.h b/xioconfig.h
index 2cbab57..5d4df2d 100644
--- a/xioconfig.h
+++ b/xioconfig.h
@@ -1,5 +1,5 @@
 /* source: xioconfig.h */
-/* Copyright Gerhard Rieger */
+/* Copyright Gerhard Rieger and contributors (see file CHANGES) */
 /* Published under the GNU General Public License V.2, see file COPYING */
 
 #ifndef __xioconfig_h_included
diff --git a/xiodiag.c b/xiodiag.c
index 2753cc1..9046579 100644
--- a/xiodiag.c
+++ b/xiodiag.c
@@ -1,5 +1,5 @@
 /* source: xiodiag.c */
-/* Copyright Gerhard Rieger 2001, 2003 */
+/* Copyright Gerhard Rieger and contributors (see file CHANGES) */
 /* Published under the GNU General Public License V.2, see file COPYING */
 
 /* this file contains source for some diagnostics */
diff --git a/xiodiag.h b/xiodiag.h
index 694730e..0dbfd15 100644
--- a/xiodiag.h
+++ b/xiodiag.h
@@ -1,5 +1,5 @@
 /* source: xiodiag.h */
-/* Copyright Gerhard Rieger 2001 */
+/* Copyright Gerhard Rieger and contributors (see file CHANGES) */
 /* Published under the GNU General Public License V.2, see file COPYING */
 
 #ifndef __xiodiag_h_included
diff --git a/xioexit.c b/xioexit.c
index 35ed78f..05b1e34 100644
--- a/xioexit.c
+++ b/xioexit.c
@@ -1,5 +1,5 @@
 /* source: xioexit.c */
-/* Copyright Gerhard Rieger */
+/* Copyright Gerhard Rieger and contributors (see file CHANGES) */
 /* Published under the GNU General Public License V.2, see file COPYING */
 
 /* this file contains the source for the extended exit function */
diff --git a/xiohelp.c b/xiohelp.c
index 5ae7f83..1977f4c 100644
--- a/xiohelp.c
+++ b/xiohelp.c
@@ -1,5 +1,5 @@
 /* source: xiohelp.c */
-/* Copyright Gerhard Rieger 2001-2009 */
+/* Copyright Gerhard Rieger and contributors (see file CHANGES) */
 /* Published under the GNU General Public License V.2, see file COPYING */
 
 /* this file contains the source for the help function */
diff --git a/xiohelp.h b/xiohelp.h
index 8348fb9..c6767bf 100644
--- a/xiohelp.h
+++ b/xiohelp.h
@@ -1,5 +1,5 @@
 /* source: xiohelp.h */
-/* Copyright Gerhard Rieger 2001 */
+/* Copyright Gerhard Rieger and contributors (see file CHANGES) */
 /* Published under the GNU General Public License V.2, see file COPYING */
 
 #ifndef __xiohelp_h_included
diff --git a/xioinitialize.c b/xioinitialize.c
index 9f50155..29d7b03 100644
--- a/xioinitialize.c
+++ b/xioinitialize.c
@@ -1,5 +1,5 @@
 /* source: xioinitialize.c */
-/* Copyright Gerhard Rieger 2001-2011 */
+/* Copyright Gerhard Rieger and contributors (see file CHANGES) */
 /* Published under the GNU General Public License V.2, see file COPYING */
 
 /* this file contains the source for the initialize function */
diff --git a/xiolayer.c b/xiolayer.c
index 9fce4bf..0256c12 100644
--- a/xiolayer.c
+++ b/xiolayer.c
@@ -1,5 +1,5 @@
 /* source: xiolayer.c */
-/* Copyright Gerhard Rieger 2001-2009 */
+/* Copyright Gerhard Rieger and contributors (see file CHANGES) */
 /* Published under the GNU General Public License V.2, see file COPYING */
 
 /* this file contains the source for common options */
diff --git a/xiolayer.h b/xiolayer.h
index 4ec2c5e..5e3c65a 100644
--- a/xiolayer.h
+++ b/xiolayer.h
@@ -1,5 +1,5 @@
 /* source: xiolayer.h */
-/* Copyright Gerhard Rieger 2001-2008 */
+/* Copyright Gerhard Rieger and contributors (see file CHANGES) */
 /* Published under the GNU General Public License V.2, see file COPYING */
 
 #ifndef __xiolayer_h_included
diff --git a/xiolockfile.c b/xiolockfile.c
index 8de62af..13a42b6 100644
--- a/xiolockfile.c
+++ b/xiolockfile.c
@@ -1,5 +1,5 @@
 /* source: xiolockfile.c */
-/* Copyright Gerhard Rieger 2005-2011 */
+/* Copyright Gerhard Rieger and contributors (see file CHANGES) */
 /* Published under the GNU General Public License V.2, see file COPYING */
 
 /* this file contains socats explicit locking mechanisms */
diff --git a/xiolockfile.h b/xiolockfile.h
index 1cf99c0..d485c75 100644
--- a/xiolockfile.h
+++ b/xiolockfile.h
@@ -1,5 +1,5 @@
 /* source: xiolockfile.h */
-/* Copyright Gerhard Rieger 2005 */
+/* Copyright Gerhard Rieger and contributors (see file CHANGES) */
 /* Published under the GNU General Public License V.2, see file COPYING */
 
 #ifndef __xiolockfile_h_included
diff --git a/xiomodes.h b/xiomodes.h
index 602eab0..35c1767 100644
--- a/xiomodes.h
+++ b/xiomodes.h
@@ -1,5 +1,5 @@
 /* source: xiomodes.h */
-/* Copyright Gerhard Rieger 2001-2008 */
+/* Copyright Gerhard Rieger and contributors (see file CHANGES) */
 /* Published under the GNU General Public License V.2, see file COPYING */
 
 #ifndef __xiomodes_h_included
diff --git a/xioopen.c b/xioopen.c
index 88620c6..7f55227 100644
--- a/xioopen.c
+++ b/xioopen.c
@@ -1,5 +1,5 @@
 /* source: xioopen.c */
-/* Copyright Gerhard Rieger 2001-2008 */
+/* Copyright Gerhard Rieger and contributors (see file CHANGES) */
 /* Published under the GNU General Public License V.2, see file COPYING */
 
 /* this is the source file of the extended open function */
diff --git a/xioopen.h b/xioopen.h
index 2002be4..8baad24 100644
--- a/xioopen.h
+++ b/xioopen.h
@@ -1,5 +1,5 @@
 /* source: xioopen.h */
-/* Copyright Gerhard Rieger 2001-2008 */
+/* Copyright Gerhard Rieger and contributors (see file CHANGES) */
 /* Published under the GNU General Public License V.2, see file COPYING */
 
 #ifndef __xioopen_h_included
diff --git a/xioopts.c b/xioopts.c
index 3b0f300..178842f 100644
--- a/xioopts.c
+++ b/xioopts.c
@@ -1,5 +1,5 @@
 /* source: xioopts.c */
-/* Copyright Gerhard Rieger */
+/* Copyright Gerhard Rieger and contributors (see file CHANGES) */
 /* Published under the GNU General Public License V.2, see file COPYING */
 
 /* this file contains the source for address options handling */
diff --git a/xioopts.h b/xioopts.h
index ebcf315..95a44a4 100644
--- a/xioopts.h
+++ b/xioopts.h
@@ -1,5 +1,5 @@
 /* source: xioopts.h */
-/* Copyright Gerhard Rieger */
+/* Copyright Gerhard Rieger and contributors (see file CHANGES) */
 /* Published under the GNU General Public License V.2, see file COPYING */
 
 #ifndef __xioopts_h_included
diff --git a/xioparam.c b/xioparam.c
index d13cb27..da270ea 100644
--- a/xioparam.c
+++ b/xioparam.c
@@ -1,5 +1,5 @@
 /* source: xioparam.c */
-/* Copyright Gerhard Rieger */
+/* Copyright Gerhard Rieger and contributors (see file CHANGES) */
 /* Published under the GNU General Public License V.2, see file COPYING */
 
 /* this file contains the source for xio options handling */
diff --git a/xioread.c b/xioread.c
index c000434..f4dd8e6 100644
--- a/xioread.c
+++ b/xioread.c
@@ -1,5 +1,5 @@
 /* source: xioread.c */
-/* Copyright Gerhard Rieger 2001-2010 */
+/* Copyright Gerhard Rieger and contributors (see file CHANGES) */
 /* Published under the GNU General Public License V.2, see file COPYING */
 
 /* this is the source of the extended read function */
diff --git a/xioshutdown.c b/xioshutdown.c
index e7833de..6470782 100644
--- a/xioshutdown.c
+++ b/xioshutdown.c
@@ -1,5 +1,5 @@
 /* source: xioshutdown.c */
-/* Copyright Gerhard Rieger */
+/* Copyright Gerhard Rieger and contributors (see file CHANGES) */
 /* Published under the GNU General Public License V.2, see file COPYING */
 
 /* this is the source of the extended shutdown function */
diff --git a/xiosigchld.c b/xiosigchld.c
index 0e7d0b0..a92a87a 100644
--- a/xiosigchld.c
+++ b/xiosigchld.c
@@ -1,5 +1,5 @@
 /* source: xiosigchld.c */
-/* Copyright Gerhard Rieger */
+/* Copyright Gerhard Rieger and contributors (see file CHANGES) */
 /* Published under the GNU General Public License V.2, see file COPYING */
 
 /* this is the source of the extended child signal handler */
diff --git a/xiosignal.c b/xiosignal.c
index c795aeb..6982ed3 100644
--- a/xiosignal.c
+++ b/xiosignal.c
@@ -1,5 +1,5 @@
 /* source: xiosignal.c */
-/* Copyright Gerhard Rieger */
+/* Copyright Gerhard Rieger and contributors (see file CHANGES) */
 /* Published under the GNU General Public License V.2, see file COPYING */
 
 /* this file contains code for handling signals (except SIGCHLD) */
diff --git a/xiosysincludes.h b/xiosysincludes.h
index 73b4ce2..f509c0a 100644
--- a/xiosysincludes.h
+++ b/xiosysincludes.h
@@ -1,5 +1,5 @@
 /* source: xiosysincludes.h */
-/* Copyright Gerhard Rieger 2001 */
+/* Copyright Gerhard Rieger and contributors (see file CHANGES) */
 /* Published under the GNU General Public License V.2, see file COPYING */
 
 #ifndef __xiosysincludes_h_included
diff --git a/xiowrite.c b/xiowrite.c
index 569aae7..7264ca6 100644
--- a/xiowrite.c
+++ b/xiowrite.c
@@ -1,5 +1,5 @@
 /* source: xiowrite.c */
-/* Copyright Gerhard Rieger 2001-2011 */
+/* Copyright Gerhard Rieger and contributors (see file CHANGES) */
 /* Published under the GNU General Public License V.2, see file COPYING */
 
 /* this is the source of the extended write function */