diff --git a/LICENSE b/LICENSE
index 511343a8dfd4bb..b469b745ced4db 100644
--- a/LICENSE
+++ b/LICENSE
@@ -1774,6 +1774,35 @@ The externally maintained libraries used by Node.js are:
     OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
   """
 
+- gypi_to_gn.py, located at tools/gypi_to_gn.py, is licensed as follows:
+  """
+    Redistribution and use in source and binary forms, with or without
+    modification, are permitted provided that the following conditions are
+    met:
+
+       * Redistributions of source code must retain the above copyright
+    notice, this list of conditions and the following disclaimer.
+       * 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 Google LLC 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 IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+    A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+    OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+    SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+    LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+    DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+    THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+    (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+    OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+  """
+
 - ESLint, located at tools/node_modules/eslint, is licensed as follows:
   """
     Copyright OpenJS Foundation and other contributors, <www.openjsf.org>
@@ -2153,9 +2182,9 @@ The externally maintained libraries used by Node.js are:
 - base64, located at deps/base64/base64/, is licensed as follows:
   """
     Copyright (c) 2005-2007, Nick Galbreath
-    Copyright (c) 2013-2019, Alfred Klomp
-    Copyright (c) 2015-2017, Wojciech Mula
+    Copyright (c) 2015-2018, Wojciech Muła
     Copyright (c) 2016-2017, Matthieu Darbois
+    Copyright (c) 2013-2022, Alfred Klomp
     All rights reserved.
 
     Redistribution and use in source and binary forms, with or without
diff --git a/deps/ada/unofficial.gni b/deps/ada/unofficial.gni
index d3d14193c5a154..ab7dc27de3e304 100644
--- a/deps/ada/unofficial.gni
+++ b/deps/ada/unofficial.gni
@@ -1,7 +1,3 @@
-# Copyright 2023 Microsoft Inc.
-# Use of this source code is governed by a BSD-style license that can be
-# found in the LICENSE file.
-
 # This file is used by GN for building, which is NOT the build system used for
 # building official binaries.
 # Please edit the gyp files if you are making changes to build system.
diff --git a/deps/base64/unofficial.gni b/deps/base64/unofficial.gni
index 8138d88798e1df..030f866d7138ab 100644
--- a/deps/base64/unofficial.gni
+++ b/deps/base64/unofficial.gni
@@ -1,9 +1,3 @@
-# Copyright (c) 2013-2022 GitHub Inc.
-# Copyright 2022 the V8 project authors. All rights reserved.
-# Copyright 2023 Microsoft Inc.
-# Use of this source code is governed by a BSD-style license that can be
-# found in the LICENSE file.
-
 # This file is used by GN for building, which is NOT the build system used for
 # building official binaries.
 # Please edit the gyp files if you are making changes to build system.
diff --git a/deps/brotli/unofficial.gni b/deps/brotli/unofficial.gni
index ce1df0d14cc01b..5e07e106672a04 100644
--- a/deps/brotli/unofficial.gni
+++ b/deps/brotli/unofficial.gni
@@ -1,9 +1,3 @@
-# Copyright 2014 The Chromium Authors. All rights reserved.
-# Copyright 2019 the V8 project authors. All rights reserved.
-# Copyright 2023 Microsoft Inc.
-# Use of this source code is governed by a BSD-style license that can be
-# found in the LICENSE file.
-
 # This file is used by GN for building, which is NOT the build system used for
 # building official binaries.
 # Please edit the gyp files if you are making changes to build system.
diff --git a/deps/cares/unofficial.gni b/deps/cares/unofficial.gni
index 07e2ed65b36deb..a925eb14f33361 100644
--- a/deps/cares/unofficial.gni
+++ b/deps/cares/unofficial.gni
@@ -1,9 +1,3 @@
-# Copyright (c) 2013-2019 GitHub Inc.
-# Copyright 2019 the V8 project authors. All rights reserved.
-# Copyright 2023 Microsoft Inc.
-# Use of this source code is governed by a BSD-style license that can be
-# found in the LICENSE file.
-
 # This file is used by GN for building, which is NOT the build system used for
 # building official binaries.
 # Please edit the gyp files if you are making changes to build system.
diff --git a/deps/googletest/unofficial.gni b/deps/googletest/unofficial.gni
index e262d1bc1829a1..1bf78f1adfed60 100644
--- a/deps/googletest/unofficial.gni
+++ b/deps/googletest/unofficial.gni
@@ -1,7 +1,3 @@
-# Copyright 2021 the V8 project authors. All rights reserved.
-# Use of this source code is governed by a BSD-style license that can be
-# found in the LICENSE file.
-
 # This file is used by GN for building, which is NOT the build system used for
 # building official binaries.
 # Please edit the gyp files if you are making changes to build system.
diff --git a/deps/histogram/unofficial.gni b/deps/histogram/unofficial.gni
index eedb62049097d7..1173ab298ae73b 100644
--- a/deps/histogram/unofficial.gni
+++ b/deps/histogram/unofficial.gni
@@ -1,9 +1,3 @@
-# Copyright (c) 2013-2019 GitHub Inc.
-# Copyright 2019 the V8 project authors. All rights reserved.
-# Copyright 2023 Microsoft Inc.
-# Use of this source code is governed by a BSD-style license that can be
-# found in the LICENSE file.
-
 # This file is used by GN for building, which is NOT the build system used for
 # building official binaries.
 # Please edit the gyp files if you are making changes to build system.
diff --git a/deps/llhttp/unofficial.gni b/deps/llhttp/unofficial.gni
index 80e360d472610c..fdce32e59764a0 100644
--- a/deps/llhttp/unofficial.gni
+++ b/deps/llhttp/unofficial.gni
@@ -1,8 +1,3 @@
-# Copyright (c) 2013-2019 GitHub Inc.
-# Copyright 2019 the V8 project authors. All rights reserved.
-# Use of this source code is governed by a BSD-style license that can be
-# found in the LICENSE file.
-
 # This file is used by GN for building, which is NOT the build system used for
 # building official binaries.
 # Please edit the gyp files if you are making changes to build system.
diff --git a/deps/nghttp2/unofficial.gni b/deps/nghttp2/unofficial.gni
index 0d84500a66f249..6b3f23a7b0b662 100644
--- a/deps/nghttp2/unofficial.gni
+++ b/deps/nghttp2/unofficial.gni
@@ -1,8 +1,3 @@
-# Copyright (c) 2013-2019 GitHub Inc.
-# Copyright 2019 the V8 project authors. All rights reserved.
-# Use of this source code is governed by a BSD-style license that can be
-# found in the LICENSE file.
-
 # This file is used by GN for building, which is NOT the build system used for
 # building official binaries.
 # Please edit the gyp files if you are making changes to build system.
diff --git a/deps/ngtcp2/unofficial.gni b/deps/ngtcp2/unofficial.gni
index a304cf4aded42d..7665b5b0d1dce3 100644
--- a/deps/ngtcp2/unofficial.gni
+++ b/deps/ngtcp2/unofficial.gni
@@ -1,8 +1,3 @@
-# Copyright (c) 2013-2021 GitHub Inc.
-# Copyright 2021 the V8 project authors. All rights reserved.
-# Use of this source code is governed by a BSD-style license that can be
-# found in the LICENSE file.
-
 # This file is used by GN for building, which is NOT the build system used for
 # building official binaries.
 # Please edit the gyp files if you are making changes to build system.
diff --git a/deps/openssl/unofficial.gni b/deps/openssl/unofficial.gni
index 9b94ccb275e7bc..31f31043812427 100644
--- a/deps/openssl/unofficial.gni
+++ b/deps/openssl/unofficial.gni
@@ -1,8 +1,3 @@
-# Copyright 2019 the V8 project authors. All rights reserved.
-# Copyright 2023 Microsoft Inc.
-# Use of this source code is governed by a BSD-style license that can be
-# found in the LICENSE file.
-
 # This file is used by GN for building, which is NOT the build system used for
 # building official binaries.
 # Please edit the gyp files if you are making changes to build system.
diff --git a/deps/postject/unofficial.gni b/deps/postject/unofficial.gni
index 6a4d2ddb36e782..cbd5e841582100 100644
--- a/deps/postject/unofficial.gni
+++ b/deps/postject/unofficial.gni
@@ -1,7 +1,3 @@
-# Copyright 2023 Microsoft Inc.
-# Use of this source code is governed by a BSD-style license that can be
-# found in the LICENSE file.
-
 # This file is used by GN for building, which is NOT the build system used for
 # building official binaries.
 # Please edit the gyp files if you are making changes to build system.
diff --git a/deps/simdutf/unofficial.gni b/deps/simdutf/unofficial.gni
index d623de36312e3e..544466c5344fa8 100644
--- a/deps/simdutf/unofficial.gni
+++ b/deps/simdutf/unofficial.gni
@@ -1,8 +1,3 @@
-# Copyright (c) 2013-2019 GitHub Inc.
-# Copyright 2019 the V8 project authors. All rights reserved.
-# Use of this source code is governed by a BSD-style license that can be
-# found in the LICENSE file.
-
 # This file is used by GN for building, which is NOT the build system used for
 # building official binaries.
 # Please edit the gyp files if you are making changes to build system.
diff --git a/deps/uv/unofficial.gni b/deps/uv/unofficial.gni
index 64d6bcbc5c13da..eb5779995eb2b4 100644
--- a/deps/uv/unofficial.gni
+++ b/deps/uv/unofficial.gni
@@ -1,9 +1,3 @@
-# Copyright (c) 2013-2019 GitHub Inc.
-# Copyright 2019 the V8 project authors. All rights reserved.
-# Copyright 2023 Microsoft Inc.
-# Use of this source code is governed by a BSD-style license that can be
-# found in the LICENSE file.
-
 # This file is used by GN for building, which is NOT the build system used for
 # building official binaries.
 # Please edit the gyp files if you are making changes to build system.
diff --git a/deps/uvwasi/unofficial.gni b/deps/uvwasi/unofficial.gni
index 17f4c8e6eed0b3..b7f30c448626ad 100644
--- a/deps/uvwasi/unofficial.gni
+++ b/deps/uvwasi/unofficial.gni
@@ -1,9 +1,3 @@
-# Copyright (c) 2013-2019 GitHub Inc.
-# Copyright 2019 the V8 project authors. All rights reserved.
-# Copyright 2023 Microsoft Inc.
-# Use of this source code is governed by a BSD-style license that can be
-# found in the LICENSE file.
-
 # This file is used by GN for building, which is NOT the build system used for
 # building official binaries.
 # Please edit the gyp files if you are making changes to build system.
diff --git a/src/inspector/unofficial.gni b/src/inspector/unofficial.gni
index b562109e94c17d..5d87f3c901ab50 100644
--- a/src/inspector/unofficial.gni
+++ b/src/inspector/unofficial.gni
@@ -1,9 +1,3 @@
-# Copyright (c) 2013-2019 GitHub Inc.
-# Copyright 2019 the V8 project authors. All rights reserved.
-# Copyright 2023 Microsoft Inc.
-# Use of this source code is governed by a BSD-style license that can be
-# found in the LICENSE file.
-
 import("../../node.gni")
 import("$node_v8_path/gni/v8.gni")
 
diff --git a/tools/gypi_to_gn.py b/tools/gypi_to_gn.py
index 47182d8017bfc2..77a68ff07ed4eb 100755
--- a/tools/gypi_to_gn.py
+++ b/tools/gypi_to_gn.py
@@ -1,7 +1,32 @@
 #!/usr/bin/env python3
 # Copyright 2014 The Chromium Authors. All rights reserved.
-# Use of this source code is governed by a BSD-style license that can be
-# found in the LICENSE file.
+#
+# Redistribution and use in source and binary forms, with or without
+# modification, are permitted provided that the following conditions are
+# met:
+#
+#    * Redistributions of source code must retain the above copyright
+# notice, this list of conditions and the following disclaimer.
+#    * 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 Google LLC 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 IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+# A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+# OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+# SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+# LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+# DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+# THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+# (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+# OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
 # Deleted from Chromium in https://crrev.com/097f64c631.
 
 """Converts a given gypi file to a python scope and writes the result to stdout.
diff --git a/tools/license-builder.sh b/tools/license-builder.sh
index 10b894262946ea..67769511294e5b 100755
--- a/tools/license-builder.sh
+++ b/tools/license-builder.sh
@@ -103,6 +103,8 @@ addlicense "markupsafe" "tools/inspector_protocol/markupsafe" "$licenseText"
 # Testing tools
 licenseText="$(sed -e '/^$/,$d' -e 's/^#$//' -e 's/^# //' "${rootdir}/tools/cpplint.py" | tail -n +3)"
 addlicense "cpplint.py" "tools/cpplint.py" "$licenseText"
+licenseText="$(sed -e '/^$/,$d' -e 's/^#$//' -e 's/^# //' "${rootdir}/tools/gypi_to_gn.py" | tail -n +3)"
+addlicense "gypi_to_gn.py" "tools/gypi_to_gn.py" "$licenseText"
 licenseText="$(cat "${rootdir}/tools/node_modules/eslint/LICENSE")"
 addlicense "ESLint" "tools/node_modules/eslint" "$licenseText"
 licenseText="$(cat "${rootdir}/deps/googletest/LICENSE")"
diff --git a/unofficial.gni b/unofficial.gni
index 29685d4ade559f..ba0ba266b76302 100644
--- a/unofficial.gni
+++ b/unofficial.gni
@@ -1,9 +1,3 @@
-# Copyright (c) 2013-2019 GitHub Inc.
-# Copyright 2019 the V8 project authors. All rights reserved.
-# Copyright 2023 Microsoft Inc.
-# Use of this source code is governed by a BSD-style license that can be
-# found in the LICENSE file.
-
 # This file is used by GN for building, which is NOT the build system used for
 # building official binaries.
 # Please take a look at node.gyp if you are making changes to build system.