diff --git a/Tools/AddLicense/AddLicense.sh b/Tools/AddLicense/AddLicense.sh
new file mode 100644
index 000000000..a5b080513
--- /dev/null
+++ b/Tools/AddLicense/AddLicense.sh
@@ -0,0 +1,67 @@
+#!/bin/bash
+
+# This Source Code Form is subject to the terms of the Mozilla Public
+# License, v. 2.0. If a copy of the MPL was not distributed with this
+# file, You can obtain one at https://mozilla.org/MPL/2.0/.
+
+function addLicense() {
+  local MPL=(
+    'This Source Code Form is subject to the terms of the Mozilla Public'
+    'License, v. 2.0. If a copy of the MPL was not distributed with this'
+    'file, You can obtain one at https://mozilla.org/MPL/2.0/.'
+  )
+  local comment=''
+  local fileType=${1##*.}
+  local lineNumber=1
+
+  # 各種ファイルに適したコメントを生成する
+  if [ "$fileType" == 'axml' ]; then
+    comment='\\n'$(printf '<!-- %s\\n - %s\\n - %s -->\\n' "${MPL[@]}")
+    lineNumber=2 # XML 宣言の後に挿入する
+
+  elif [ "$fileType" == 'bat' ]; then
+    comment=$(printf '@REM %s\\n' "${MPL[@]}")
+
+  elif [ "$fileType" == 'cs' ]; then
+    comment=$(printf '/* %s\\n * %s\\n * %s */\\n' "${MPL[@]}")
+
+  elif [ "$fileType" == 'feature' ]; then
+    comment=$(printf '# %s\\n' "${MPL[@]}")
+
+  elif [ "$fileType" == 'resx' ]; then
+    comment='\\n'$(printf '<!-- %s\\n - %s\\n - %s -->\\n' "${MPL[@]}")
+    lineNumber=2 # XML 宣言の後に挿入する
+
+  elif [ "$fileType" == 'sh' ]; then
+    comment='\\n'$(printf '# %s\\n' "${MPL[@]}")
+    lineNumber=2 # Shebang の後に挿入する
+
+  elif [ "$fileType" == 'storyboard' ]; then
+    comment='\\n'$(printf '<!-- %s\\n - %s\\n - %s -->\\n' "${MPL[@]}")
+    lineNumber=2 # XML 宣言の後に挿入する
+
+  elif [ "$fileType" == 'strings' ]; then
+    comment=$(printf '/* %s\\n * %s\\n * %s */\\n' "${MPL[@]}")
+
+  elif [ "$fileType" == 'tf' ]; then
+    comment=$(printf '# %s\\n' "${MPL[@]}")
+
+  elif [ "$fileType" == 'xaml' ]; then
+    comment='\\n'$(printf '<!-- %s\\n - %s\\n - %s -->\\n' "${MPL[@]}")
+    lineNumber=2 # XML 宣言の後に挿入する
+
+  elif [ "$fileType" == 'xml' ]; then
+    comment='\\n'$(printf '<!-- %s\\n - %s\\n - %s -->\\n' "${MPL[@]}")
+    lineNumber=2 # XML 宣言の後に挿入する
+
+  elif [ "$fileType" == 'yml' ]; then
+    comment=$(printf '# %s\\n' "${MPL[@]}")
+  fi
+
+  # MPL の適用対象であるかを確認する。その中でライセンスの文言がないものに限り，生成したコメントを挿入する
+  if [ "$comment" != '' ] && [ "$(grep -c "$1" Tools/AddLicense/Exclusions.txt)" -eq 0 ]; then
+    git grep -z -I -L "${MPL[0]}" -- "$1" | xargs -0 -r sed -i -e "${lineNumber}i$comment"
+  else
+    echo "Excluded: $1"
+  fi
+}
diff --git a/Tools/AddLicense/CheckAllFiles.sh b/Tools/AddLicense/CheckAllFiles.sh
new file mode 100644
index 000000000..123051c4b
--- /dev/null
+++ b/Tools/AddLicense/CheckAllFiles.sh
@@ -0,0 +1,35 @@
+#!/bin/bash
+
+# This Source Code Form is subject to the terms of the Mozilla Public
+# License, v. 2.0. If a copy of the MPL was not distributed with this
+# file, You can obtain one at https://mozilla.org/MPL/2.0/.
+
+# リポジトリ内のファイルについて MPL の記載漏れをチェックします。
+# 詳しい処理につきましては Tools/AddLicense/AddLicense.sh をご参照ください。
+
+# リポジトリのルートへ移動
+cd "$(git rev-parse --show-toplevel)" || exit 1
+
+# `addLicense` の読み込み
+source Tools/AddLicense/AddLicense.sh && export -f addLicense
+
+# 対象ファイル（リポジトリのルートを基準とした相対パスで記述）
+FILES=(
+  '*.axml'
+  '*.bat'
+  '*.cs'
+  '*.feature'
+  '*.resx'
+  '*.sh'
+  '*.storyboard'
+  '*.strings'
+  '*.tf'
+  '*.xaml'
+  '*.xml'
+  '*.yml'
+)
+
+# 対象ファイルの内，MPL が抜けているもの対して文言を挿入する
+for file in "${FILES[@]}"; do
+  git ls-files -- "$file" | xargs -r -P 4 -I '%' bash -c 'addLicense %'
+done
diff --git a/Tools/AddLicense/Exclusions.txt b/Tools/AddLicense/Exclusions.txt
new file mode 100644
index 000000000..5db70a4b3
--- /dev/null
+++ b/Tools/AddLicense/Exclusions.txt
@@ -0,0 +1,102 @@
+.editorconfig
+.gitattributes
+.github/ISSUE_TEMPLATE/bug_report.md
+.github/ISSUE_TEMPLATE/config.yml
+.github/ISSUE_TEMPLATE/feature_request.md
+.github/PULL_REQUEST_TEMPLATE.md
+.github/workflows/CI.yml
+.gitignore
+CONTRIBUTING.md
+CONTRIBUTORS.md
+Covid19Radar.Functions.runsettings
+Covid19Radar.Functions.sln
+Covid19Radar.sln
+Covid19Radar/Covid19Radar.Android/Assets/AboutAssets.txt
+Covid19Radar/Covid19Radar.Android/Covid19Radar.Android.csproj
+Covid19Radar/Covid19Radar.Android/Resources/AboutResources.txt
+Covid19Radar/Covid19Radar.iOS/Assets.xcassets/AppIcons.appiconset/Contents.json
+Covid19Radar/Covid19Radar.iOS/Assets.xcassets/Contents.json
+Covid19Radar/Covid19Radar.iOS/Covid19Radar.iOS.csproj
+Covid19Radar/Covid19Radar.iOS/Entitlements.plist
+Covid19Radar/Covid19Radar.iOS/Info.plist
+Covid19Radar/Covid19Radar/Covid19Radar.csproj
+Covid19Radar/Covid19Radar/Memo.md
+Covid19Radar/Covid19Radar/Resources/AppResources.Designer.cs
+Covid19Radar/Covid19Radar/Resources/html/en/chatbot2.html
+Covid19Radar/Covid19Radar/Resources/html/en/chatbot3.html
+Covid19Radar/Covid19Radar/Resources/html/en/chatbot4.html
+Covid19Radar/Covid19Radar/Resources/html/en/chatbot5.html
+Covid19Radar/Covid19Radar/Resources/html/en/css/style.css
+Covid19Radar/Covid19Radar/Resources/html/en/index.html
+Covid19Radar/Covid19Radar/Resources/html/en/privacypolicy.html
+Covid19Radar/Covid19Radar/Resources/html/en/privacypolicy.md
+Covid19Radar/Covid19Radar/Resources/html/en/termofuse.html
+Covid19Radar/Covid19Radar/Resources/html/en/termofuse.md
+Covid19Radar/Covid19Radar/Resources/html/index.html
+Covid19Radar/Covid19Radar/Resources/html/ja/chatbot2.html
+Covid19Radar/Covid19Radar/Resources/html/ja/chatbot3.html
+Covid19Radar/Covid19Radar/Resources/html/ja/chatbot4.html
+Covid19Radar/Covid19Radar/Resources/html/ja/chatbot5.html
+Covid19Radar/Covid19Radar/Resources/html/ja/css/style.css
+Covid19Radar/Covid19Radar/Resources/html/ja/index.html
+Covid19Radar/Covid19Radar/Resources/html/ja/privacypolicy.html
+Covid19Radar/Covid19Radar/Resources/html/ja/privacypolicy.md
+Covid19Radar/Covid19Radar/Resources/html/ja/termofuse.html
+Covid19Radar/Covid19Radar/Resources/html/ja/termofuse.md
+Covid19Radar/Covid19Radar/Resources/html/zh-hans/chatbot2.html
+Covid19Radar/Covid19Radar/Resources/html/zh-hans/chatbot3.html
+Covid19Radar/Covid19Radar/Resources/html/zh-hans/chatbot4.html
+Covid19Radar/Covid19Radar/Resources/html/zh-hans/chatbot5.html
+Covid19Radar/Covid19Radar/Resources/html/zh-hans/css/style.css
+Covid19Radar/Covid19Radar/Resources/html/zh-hans/index.html
+Covid19Radar/Covid19Radar/Resources/html/zh-hans/privacypolicy.html
+Covid19Radar/Covid19Radar/Resources/html/zh-hans/privacypolicy.md
+Covid19Radar/Covid19Radar/Resources/html/zh-hans/termofuse.html
+Covid19Radar/Covid19Radar/Resources/html/zh-hans/termofuse.md
+Covid19Radar/Covid19Radar/settings.json
+Covid19Radar/Tests/Covid19Radar.UITest/App.config
+Covid19Radar/Tests/Covid19Radar.UITest/Covid19Radar.UITest.csproj
+Covid19Radar/Tests/Covid19Radar.UITest/Features/HomePage/ContributorsList.feature.cs
+Covid19Radar/Tests/Covid19Radar.UITest/Features/HomePage/Home.feature.cs
+Covid19Radar/Tests/Covid19Radar.UITest/Features/HomePage/LicenseAgreement.feature.cs
+Covid19Radar/Tests/Covid19Radar.UITest/Features/HomePage/UpdateInformation.feature.cs
+Covid19Radar/Tests/Covid19Radar.UITest/Features/Tutorial/Tutorial.feature.cs
+Covid19Radar/Tests/Covid19Radar.UITest/ReadMe.txt
+Covid19Radar/Tests/Covid19Radar.UITest/TestConfig.json
+Covid19Radar/Tests/Covid19Radar.UnitTests/Covid19Radar.UnitTests.csproj
+Covid19Radar/Xamarin.ExposureNotification/CallbackService.android.cs
+Covid19Radar/Xamarin.ExposureNotification/ExposureInfo.shared.cs
+Covid19Radar/Xamarin.ExposureNotification/ExposureNotification.android.cs
+Covid19Radar/Xamarin.ExposureNotification/ExposureNotification.customize.android.cs
+Covid19Radar/Xamarin.ExposureNotification/ExposureNotification.ios.cs
+Covid19Radar/Xamarin.ExposureNotification/ExposureNotification.netstandard.cs
+Covid19Radar/Xamarin.ExposureNotification/ExposureNotification.shared.cs
+Covid19Radar/Xamarin.ExposureNotification/IExposureNotificationHandler.shared.cs
+Covid19Radar/Xamarin.ExposureNotification/TemporaryExposureKey.shared.cs
+Covid19Radar/Xamarin.ExposureNotification/Xamarin.ExposureNotification.csproj
+OPERATION_POLICY.md
+README.ja.md
+README.md
+Tools/ConvertBase64/ConvertBase64.sln
+Tools/ConvertBase64/ConvertBase64/ConvertBase64.csproj
+Tools/GenerateKeys/GenerateKeys.sln
+Tools/GenerateKeys/GenerateKeys/GenerateKeys.csproj
+Tools/UpdateUserStatusTool/UpdateUserStatusTool.sln
+Tools/UpdateUserStatusTool/UpdateUserStatusTool/App.config.example
+Tools/UpdateUserStatusTool/UpdateUserStatusTool/Properties/launchSettings.json
+Tools/UpdateUserStatusTool/UpdateUserStatusTool/UpdateUserStatusTool.csproj
+infrastructure/01_init/Readme.md
+infrastructure/02_runtime/Readme.md
+infrastructure/Readme.md
+src/Covid19Radar.Api.Common/Covid19Radar.Api.Common.csproj
+src/Covid19Radar.Api.External/Covid19Radar.Api.External.csproj
+src/Covid19Radar.Api.External/host.json
+src/Covid19Radar.Api.External/local.settings.json.example
+src/Covid19Radar.Api.Tests/Covid19Radar.Api.Tests.csproj
+src/Covid19Radar.Api/Covid19Radar.Api.csproj
+src/Covid19Radar.Api/host.json
+src/Covid19Radar.Api/local.settings.json.example
+src/Covid19Radar.Background/Covid19Radar.Background.csproj
+src/Covid19Radar.Background/Protobuf/TemporaryExposureKeyExportFileFormat.proto
+src/Covid19Radar.Background/host.json
+src/Covid19Radar.Background/local.settings.json.example
diff --git a/Tools/GitHooks/PreCommit.sh b/Tools/GitHooks/PreCommit.sh
new file mode 100644
index 000000000..9b2611da5
--- /dev/null
+++ b/Tools/GitHooks/PreCommit.sh
@@ -0,0 +1,23 @@
+#!/bin/bash
+
+# This Source Code Form is subject to the terms of the Mozilla Public
+# License, v. 2.0. If a copy of the MPL was not distributed with this
+# file, You can obtain one at https://mozilla.org/MPL/2.0/.
+
+# Commit 時に MPL の記載漏れをチェックします。
+# あらかじめ Tools/GitHooks/PrepareHooks.sh を実行する必要があります。
+# 詳しい処理につきましては Tools/AddLicense/AddLicense.sh をご参照ください。
+
+# リポジトリのルートへ移動
+cd "$(git rev-parse --show-toplevel)" || exit 1
+
+# `addLicense` の読み込み
+source Tools/AddLicense/AddLicense.sh
+
+# ステージングエリアのファイル一覧を取得（削除を除く）
+stagedFiles=$(git diff --name-only --cached --diff-filter=d)
+
+# 対象ファイルの内，MPL が抜けているもの対して文言を挿入する
+for file in $stagedFiles; do
+  addLicense "$file" && git add "$file"
+done
diff --git a/Tools/GitHooks/PrepareHooks.sh b/Tools/GitHooks/PrepareHooks.sh
new file mode 100644
index 000000000..7f4c7a24c
--- /dev/null
+++ b/Tools/GitHooks/PrepareHooks.sh
@@ -0,0 +1,14 @@
+#!/bin/bash
+
+# This Source Code Form is subject to the terms of the Mozilla Public
+# License, v. 2.0. If a copy of the MPL was not distributed with this
+# file, You can obtain one at https://mozilla.org/MPL/2.0/.
+
+# リポジトリのルートへ移動
+cd "$(git rev-parse --show-toplevel)" || exit 1
+
+# pre-commit 用のスクリプトを追加
+install -m 755 -D Tools/GitHooks/PreCommit.sh .git/hooks/pre-commit
+
+# 追加した Git Hooks を有効にする
+git init