diff --git a/COPYRIGHT b/COPYRIGHT
index 340fd6cd..3a82ea38 100644
--- a/COPYRIGHT
+++ b/COPYRIGHT
@@ -1,6 +1,6 @@
-Copyright (c) 2009-2025, NIPPON TELEGRAPH AND TELEPHONE CORPORATION
+Copyright (c) 2009-2026, NTT, Inc.
 
-Portions Copyright (c) 1996-2025, PostgreSQL Global Development Group
+Portions Copyright (c) 1996-2026, PostgreSQL Global Development Group
 Portions Copyright (c) 1994, The Regents of the University of California
 
 Redistribution and use in source and binary forms, with or without
@@ -11,10 +11,9 @@ modification, are permitted provided that the following conditions are met:
     * Redistributions in binary form must reproduce the above copyright
       notice, this list of conditions and the following disclaimer in the
       documentation and/or other materials provided with the distribution.
-    * Neither the name of the NIPPON TELEGRAPH AND TELEPHONE CORPORATION
-      (NTT) nor the names of its contributors may be used to endorse or
-      promote products derived from this software without specific prior
-      written permission.
+    * Neither the name of the NTT, Inc. nor the names of its contributors may be
+      used to endorse or promote products derived from this software without
+      specific prior written permission.
 
 THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
 AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
diff --git a/Makefile b/Makefile
index 847c2c72..5f6a5de0 100644
--- a/Makefile
+++ b/Makefile
@@ -1,7 +1,7 @@
 #
 # pg_rman: Makefile
 #
-#  Portions Copyright (c) 2008-2021, NIPPON TELEGRAPH AND TELEPHONE CORPORATION
+#  Portions Copyright (c) 2008-2026, NTT, Inc.
 #
 PROGRAM = pg_rman
 SRCS = \
diff --git a/SPECS/pg_rman14.spec b/SPECS/pg_rman14.spec
index de54bc9f..b1c67b03 100644
--- a/SPECS/pg_rman14.spec
+++ b/SPECS/pg_rman14.spec
@@ -1,5 +1,5 @@
 # SPEC file for pg_rman
-# Copyright(C) 2009-2025 NIPPON TELEGRAPH AND TELEPHONE CORPORATION
+# Copyright(C) 2009-2026 NTT, Inc.
 
 %define _pgdir   /usr/pgsql-14
 %define _bindir  %{_pgdir}/bin
@@ -16,7 +16,7 @@ Group:      Applications/Databases
 Source0:    %{name}-%{version}-pg14.tar.gz
 URL:        https://github.com/ossc-db/pg_rman
 BuildRoot:  %{_tmppath}/%{name}-%{version}-%{release}-%(%{__id_u} -n)
-Vendor:     NIPPON TELEGRAPH AND TELEPHONE CORPORATION
+Vendor:     NTT, Inc.
 
 ## We use postgresql-devel package
 BuildRequires:  postgresql14-devel, zlib-devel
diff --git a/backup.c b/backup.c
index 1c050042..819f73d9 100644
--- a/backup.c
+++ b/backup.c
@@ -2,7 +2,7 @@
  *
  * backup.c: backup DB cluster, archived WAL, serverlog.
  *
- * Copyright (c) 2009-2025, NIPPON TELEGRAPH AND TELEPHONE CORPORATION
+ * Copyright (c) 2009-2026, NTT, Inc.
  *
  *-------------------------------------------------------------------------
  */
diff --git a/catalog.c b/catalog.c
index 4ea40345..80f79c05 100644
--- a/catalog.c
+++ b/catalog.c
@@ -2,7 +2,7 @@
  *
  * catalog.c: backup catalog operation
  *
- * Copyright (c) 2009-2025, NIPPON TELEGRAPH AND TELEPHONE CORPORATION
+ * Copyright (c) 2009-2026, NTT, Inc.
  *
  *-------------------------------------------------------------------------
  */
diff --git a/data.c b/data.c
index 4822da2e..5d428729 100644
--- a/data.c
+++ b/data.c
@@ -3,7 +3,7 @@
  * data.c: utilities for backing up and restoring database files along with
  * the support for compression/decompression of individual data file pages
  *
- * Copyright (c) 2009-2025, NIPPON TELEGRAPH AND TELEPHONE CORPORATION
+ * Copyright (c) 2009-2026, NTT, Inc.
  *
  *-------------------------------------------------------------------------
  */
diff --git a/delete.c b/delete.c
index 4b32c2db..afb8f5e2 100644
--- a/delete.c
+++ b/delete.c
@@ -2,7 +2,7 @@
  *
  * delete.c: delete backup files.
  *
- * Copyright (c) 2009-2025, NIPPON TELEGRAPH AND TELEPHONE CORPORATION
+ * Copyright (c) 2009-2026, NTT, Inc.
  *
  *-------------------------------------------------------------------------
  */
diff --git a/dir.c b/dir.c
index d5fffa47..8324d15c 100644
--- a/dir.c
+++ b/dir.c
@@ -2,7 +2,7 @@
  *
  * dir.c: directory operation utility.
  *
- * Copyright (c) 2009-2025, NIPPON TELEGRAPH AND TELEPHONE CORPORATION
+ * Copyright (c) 2009-2026, NTT, Inc.
  *
  *-------------------------------------------------------------------------
  */
diff --git a/docs/index-ja.html b/docs/index-ja.html
index cb642d81..c4925708 100644
--- a/docs/index-ja.html
+++ b/docs/index-ja.html
@@ -1468,7 +1468,7 @@ <h1 id="seealso">関連項目</h2>
 
 <hr />
 
-<p class="footer">Copyright (c) 2009-2025, NIPPON TELEGRAPH AND TELEPHONE CORPORATION</p>
+<p class="footer">Copyright (c) 2009-2026, NTT, Inc.</p>
 
 </body>
 </html>
\ No newline at end of file
diff --git a/docs/index.html b/docs/index.html
index d8eda212..44d6077a 100644
--- a/docs/index.html
+++ b/docs/index.html
@@ -1458,7 +1458,7 @@ <h1 id="seealso">See Also</h2>
 
 <hr />
 
-<p class="footer">Copyright (c) 2009-2025, NIPPON TELEGRAPH AND TELEPHONE CORPORATION</p>
+<p class="footer">Copyright (c) 2009-2026, NTT, Inc.</p>
 
 </body>
 </html>
\ No newline at end of file
diff --git a/idxpagehdr.h b/idxpagehdr.h
index 33ec45b8..0676ee15 100644
--- a/idxpagehdr.h
+++ b/idxpagehdr.h
@@ -13,7 +13,7 @@
  * file!!!  Although, incompatible changes to the definitions in this file
  * will be rare.
  *
- * Copyright (c) 2009-2025, NIPPON TELEGRAPH AND TELEPHONE CORPORATION
+ * Copyright (c) 2009-2026, NTT, Inc.
  *
  *-------------------------------------------------------------------------
  */
diff --git a/init.c b/init.c
index 96feb741..d4a18c9a 100644
--- a/init.c
+++ b/init.c
@@ -2,7 +2,7 @@
  *
  * init.c: manage backup catalog.
  *
- * Copyright (c) 2009-2025, NIPPON TELEGRAPH AND TELEPHONE CORPORATION
+ * Copyright (c) 2009-2026, NTT, Inc.
  *
  *-------------------------------------------------------------------------
  */
diff --git a/parray.c b/parray.c
index 1d7eb20e..fdb96c0e 100644
--- a/parray.c
+++ b/parray.c
@@ -2,7 +2,7 @@
  *
  * parray.c: pointer array collection.
  *
- * Copyright (c) 2009-2025, NIPPON TELEGRAPH AND TELEPHONE CORPORATION
+ * Copyright (c) 2009-2026, NTT, Inc.
  *
  *-------------------------------------------------------------------------
  */
diff --git a/parray.h b/parray.h
index f5ac4c21..88181164 100644
--- a/parray.h
+++ b/parray.h
@@ -2,7 +2,7 @@
  *
  * parray.h: pointer array collection.
  *
- * Copyright (c) 2009-2025, NIPPON TELEGRAPH AND TELEPHONE CORPORATION
+ * Copyright (c) 2009-2026, NTT, Inc.
  *
  *-------------------------------------------------------------------------
  */
diff --git a/pg_rman.c b/pg_rman.c
index 0b66906f..c0ea4f35 100644
--- a/pg_rman.c
+++ b/pg_rman.c
@@ -2,7 +2,7 @@
  *
  * pg_rman.c: Backup/Recovery manager for PostgreSQL.
  *
- * Copyright (c) 2009-2025, NIPPON TELEGRAPH AND TELEPHONE CORPORATION
+ * Copyright (c) 2009-2026, NTT, Inc.
  *
  *-------------------------------------------------------------------------
  */
diff --git a/pg_rman.h b/pg_rman.h
index 8fc4409c..296357c2 100644
--- a/pg_rman.h
+++ b/pg_rman.h
@@ -2,7 +2,7 @@
  *
  * pg_rman.h: Backup/Recovery manager for PostgreSQL.
  *
- * Copyright (c) 2009-2025, NIPPON TELEGRAPH AND TELEPHONE CORPORATION
+ * Copyright (c) 2009-2026, NTT, Inc.
  *
  *-------------------------------------------------------------------------
  */
diff --git a/pgut/pgut-port.c b/pgut/pgut-port.c
index b3e05ff4..b85a526f 100644
--- a/pgut/pgut-port.c
+++ b/pgut/pgut-port.c
@@ -2,7 +2,7 @@
  *
  * pgut-port.c
  *
- * Copyright (c) 2009-2025, NIPPON TELEGRAPH AND TELEPHONE CORPORATION
+ * Copyright (c) 2009-2026, NTT, Inc.
  *
  *-------------------------------------------------------------------------
  */
diff --git a/pgut/pgut-port.h b/pgut/pgut-port.h
index 9bc3c068..b2e4f6d9 100644
--- a/pgut/pgut-port.h
+++ b/pgut/pgut-port.h
@@ -2,7 +2,7 @@
  *
  * pgut-port.h
  *
- * Copyright (c) 2009-2025, NIPPON TELEGRAPH AND TELEPHONE CORPORATION
+ * Copyright (c) 2009-2026, NTT, Inc.
  *
  *-------------------------------------------------------------------------
  */
diff --git a/pgut/pgut.c b/pgut/pgut.c
index b120a743..6c557070 100644
--- a/pgut/pgut.c
+++ b/pgut/pgut.c
@@ -2,7 +2,7 @@
  *
  * pgut.c
  *
- * Copyright (c) 2009-2025, NIPPON TELEGRAPH AND TELEPHONE CORPORATION
+ * Copyright (c) 2009-2026, NTT, Inc.
  *
  *-------------------------------------------------------------------------
  */
diff --git a/pgut/pgut.h b/pgut/pgut.h
index baac2bd4..ba3ebc06 100644
--- a/pgut/pgut.h
+++ b/pgut/pgut.h
@@ -2,7 +2,7 @@
  *
  * pgut.h
  *
- * Copyright (c) 2009-2025, NIPPON TELEGRAPH AND TELEPHONE CORPORATION
+ * Copyright (c) 2009-2026, NTT, Inc.
  *
  *-------------------------------------------------------------------------
  */
diff --git a/restore.c b/restore.c
index af642ed7..6c624682 100644
--- a/restore.c
+++ b/restore.c
@@ -2,7 +2,7 @@
  *
  * restore.c: restore DB cluster and archived WAL.
  *
- * Copyright (c) 2009-2025, NIPPON TELEGRAPH AND TELEPHONE CORPORATION
+ * Copyright (c) 2009-2026, NTT, Inc.
  *
  *-------------------------------------------------------------------------
  */
diff --git a/script/snapshot_script_lvm.sh b/script/snapshot_script_lvm.sh
index 09f24b1d..a4f93a20 100644
--- a/script/snapshot_script_lvm.sh
+++ b/script/snapshot_script_lvm.sh
@@ -1,6 +1,6 @@
 #!/bin/sh
 #############################################################################
-#  Copyright (c) 2009-2025, NIPPON TELEGRAPH AND TELEPHONE CORPORATION
+#  Copyright (c) 2009-2026, NTT, Inc.
 #############################################################################
 
 CMD_SUDO="/usr/bin/sudo"
diff --git a/show.c b/show.c
index 4734c1e6..5ef4085e 100644
--- a/show.c
+++ b/show.c
@@ -2,7 +2,7 @@
  *
  * show.c: show backup catalog.
  *
- * Copyright (c) 2009-2025, NIPPON TELEGRAPH AND TELEPHONE CORPORATION
+ * Copyright (c) 2009-2026, NTT, Inc.
  *
  *-------------------------------------------------------------------------
  */
diff --git a/util.c b/util.c
index d42370b3..e843731f 100644
--- a/util.c
+++ b/util.c
@@ -2,7 +2,7 @@
  *
  * util.c: log messages to log file or stderr, and misc code.
  *
- * Copyright (c) 2009-2025, NIPPON TELEGRAPH AND TELEPHONE CORPORATION
+ * Copyright (c) 2009-2026, NTT, Inc.
  *
  *-------------------------------------------------------------------------
  */
diff --git a/validate.c b/validate.c
index a6499223..29a18df3 100644
--- a/validate.c
+++ b/validate.c
@@ -2,7 +2,7 @@
  *
  * validate.c: validate backup files.
  *
- * Copyright (c) 2009-2025, NIPPON TELEGRAPH AND TELEPHONE CORPORATION
+ * Copyright (c) 2009-2026, NTT, Inc.
  *
  *-------------------------------------------------------------------------
  */
diff --git a/xlog.c b/xlog.c
index 1d4ba723..fe230754 100644
--- a/xlog.c
+++ b/xlog.c
@@ -2,7 +2,7 @@
  *
  * xlog.c: Parse WAL files.
  *
- * Copyright (c) 2009-2025, NIPPON TELEGRAPH AND TELEPHONE CORPORATION
+ * Copyright (c) 2009-2026, NTT, Inc.
  *
  *-------------------------------------------------------------------------
  */