copyright: fix out-of-date copyright ranges and missing headers

Reported by the new script 'scripts/copyright.pl'. The script has a
regex whitelist for the files that don't need copyright headers.

Removed three (mostly usesless) README files from docs/

Closes #5141

10 files changed, 30 insertions, 9 deletions

diff --git a/m4/curl-openssl.m4 b/m4/curl-openssl.m4
index d55827861..24f33aa11 100644
--- a/m4/curl-openssl.m4
+++ b/m4/curl-openssl.m4
@@ -5,7 +5,7 @@
 #                            | (__| |_| |  _ <| |___
 #                             \___|\___/|_| \_\_____|
 #
-# Copyright (C) 1998 - 2011, Daniel Stenberg, <daniel@haxx.se>, et al.
+# Copyright (C) 1998 - 2020, Daniel Stenberg, <daniel@haxx.se>, et al.
 #
 # This software is licensed as described in the file COPYING, which
 # you should have received as part of this distribution. The terms
diff --git a/m4/curl-override.m4 b/m4/curl-override.m4
index a03504982..18e4e2091 100644
--- a/m4/curl-override.m4
+++ b/m4/curl-override.m4
@@ -1,4 +1,25 @@
 #***************************************************************************
+#                                  _   _ ____  _
+#  Project                     ___| | | |  _ \| |
+#                             / __| | | | |_) | |
+#                            | (__| |_| |  _ <| |___
+#                             \___|\___/|_| \_\_____|
+#
+# Copyright (C) 1998 - 2020, Daniel Stenberg, <daniel@haxx.se>, et al.
+#
+# This software is licensed as described in the file COPYING, which
+# you should have received as part of this distribution. The terms
+# are also available at https://curl.haxx.se/docs/copyright.html.
+#
+# You may opt to use, copy, modify, merge, publish, distribute and/or sell
+# copies of the Software, and permit persons to whom the Software is
+# furnished to do so, under the terms of the COPYING file.
+#
+# This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
+# KIND, either express or implied.
+#
+###########################################################################
+#***************************************************************************
 #***************************************************************************
 
 # File version for 'aclocal' use. Keep it a single number.
diff --git a/m4/curl-reentrant.m4 b/m4/curl-reentrant.m4
index 8b5ca124b..32cbaf854 100644
--- a/m4/curl-reentrant.m4
+++ b/m4/curl-reentrant.m4
@@ -5,7 +5,7 @@
 #                            | (__| |_| |  _ <| |___
 #                             \___|\___/|_| \_\_____|
 #
-# Copyright (C) 1998 - 2009, Daniel Stenberg, <daniel@haxx.se>, et al.
+# Copyright (C) 1998 - 2020, Daniel Stenberg, <daniel@haxx.se>, et al.
 #
 # This software is licensed as described in the file COPYING, which
 # you should have received as part of this distribution. The terms
diff --git a/m4/xc-am-iface.m4 b/m4/xc-am-iface.m4
index 8fc2ea869..7070193aa 100644
--- a/m4/xc-am-iface.m4
+++ b/m4/xc-am-iface.m4
@@ -2,7 +2,7 @@
 #
 # xc-am-iface.m4
 #
-# Copyright (c) 2013 Daniel Stenberg <daniel@haxx.se>
+# Copyright (c) 2013 - 2020 Daniel Stenberg <daniel@haxx.se>
 #
 # Permission to use, copy, modify, and distribute this software for any
 # purpose with or without fee is hereby granted, provided that the above
diff --git a/m4/xc-cc-check.m4 b/m4/xc-cc-check.m4
index f95f25933..fd58ca2ce 100644
--- a/m4/xc-cc-check.m4
+++ b/m4/xc-cc-check.m4
@@ -2,7 +2,7 @@
 #
 # xc-cc-check.m4
 #
-# Copyright (c) 2013 Daniel Stenberg <daniel@haxx.se>
+# Copyright (c) 2013 - 2020, Daniel Stenberg <daniel@haxx.se>
 #
 # Permission to use, copy, modify, and distribute this software for any
 # purpose with or without fee is hereby granted, provided that the above
diff --git a/m4/xc-lt-iface.m4 b/m4/xc-lt-iface.m4
index afbd990d6..465767fc3 100644
--- a/m4/xc-lt-iface.m4
+++ b/m4/xc-lt-iface.m4
@@ -2,7 +2,7 @@
 #
 # xc-lt-iface.m4
 #
-# Copyright (c) 2013 Daniel Stenberg <daniel@haxx.se>
+# Copyright (c) 2013 - 2020, Daniel Stenberg <daniel@haxx.se>
 #
 # Permission to use, copy, modify, and distribute this software for any
 # purpose with or without fee is hereby granted, provided that the above
diff --git a/m4/xc-translit.m4 b/m4/xc-translit.m4
index 456e72782..18b63ecc8 100644
--- a/m4/xc-translit.m4
+++ b/m4/xc-translit.m4
@@ -2,7 +2,7 @@
 #
 # xc-translit.m4
 #
-# Copyright (c) 2011 Daniel Stenberg <daniel@haxx.se>
+# Copyright (c) 2011 - 2020, Daniel Stenberg <daniel@haxx.se>
 #
 # Permission to use, copy, modify, and distribute this software for any
 # purpose with or without fee is hereby granted, provided that the above
diff --git a/m4/xc-val-flgs.m4 b/m4/xc-val-flgs.m4
index 95b450b23..775c149cc 100644
--- a/m4/xc-val-flgs.m4
+++ b/m4/xc-val-flgs.m4
@@ -2,7 +2,7 @@
 #
 # xc-val-flgs.m4
 #
-# Copyright (c) 2013 Daniel Stenberg <daniel@haxx.se>
+# Copyright (c) 2013 - 2020, Daniel Stenberg <daniel@haxx.se>
 #
 # Permission to use, copy, modify, and distribute this software for any
 # purpose with or without fee is hereby granted, provided that the above
diff --git a/m4/zz50-xc-ovr.m4 b/m4/zz50-xc-ovr.m4
index 7f530dead..cf8604dcb 100644
--- a/m4/zz50-xc-ovr.m4
+++ b/m4/zz50-xc-ovr.m4
@@ -2,7 +2,7 @@
 #
 # zz50-xc-ovr.m4
 #
-# Copyright (c) 2011 Daniel Stenberg <daniel@haxx.se>
+# Copyright (c) 2011 - 2020, Daniel Stenberg <daniel@haxx.se>
 #
 # Permission to use, copy, modify, and distribute this software for any
 # purpose with or without fee is hereby granted, provided that the above
diff --git a/m4/zz60-xc-ovr.m4 b/m4/zz60-xc-ovr.m4
index 45ed8b69a..126ac0fd7 100644
--- a/m4/zz60-xc-ovr.m4
+++ b/m4/zz60-xc-ovr.m4
@@ -2,7 +2,7 @@
 #
 # zz60-xc-ovr.m4
 #
-# Copyright (c) 2013 Daniel Stenberg <daniel@haxx.se>
+# Copyright (c) 2013 - 2020, Daniel Stenberg <daniel@haxx.se>
 #
 # Permission to use, copy, modify, and distribute this software for any
 # purpose with or without fee is hereby granted, provided that the above