diff --git a/buildSrc/build.gradle b/buildSrc/build.gradle
index 0645278..d7f9785 100644
--- a/buildSrc/build.gradle
+++ b/buildSrc/build.gradle
@@ -8,4 +8,5 @@ repositories {
 
 dependencies {
     implementation 'com.github.spotbugs.snom:spotbugs-gradle-plugin:5.2.5'
+    implementation 'gradle.plugin.com.hierynomus.gradle.plugins:license-gradle-plugin:0.16.1'
 }
diff --git a/buildSrc/src/main/groovy/tanzawa.java-conventions.gradle b/buildSrc/src/main/groovy/tanzawa.java-conventions.gradle
index 47d4b86..855f29d 100644
--- a/buildSrc/src/main/groovy/tanzawa.java-conventions.gradle
+++ b/buildSrc/src/main/groovy/tanzawa.java-conventions.gradle
@@ -3,6 +3,7 @@ plugins {
     id 'checkstyle'
 
     id 'com.github.spotbugs'
+    id 'com.github.hierynomus.license'
 }
 
 if (hasProperty('mavenLocal')) {
@@ -119,3 +120,11 @@ tasks.withType(Tar) { task ->
     task.archiveExtension = 'tar.gz'
     task.compression = Compression.GZIP
 }
+
+license {
+    def confDir = 'buildSrc/src/main/resources'
+    header rootProject.file("$confDir/source-header.txt")
+    mapping('java', 'SLASHSTAR_STYLE')
+    include('**/*.java')
+    ignoreFailures true
+}
diff --git a/buildSrc/src/main/resources/source-header.txt b/buildSrc/src/main/resources/source-header.txt
new file mode 100755
index 0000000..5263e8b
--- /dev/null
+++ b/buildSrc/src/main/resources/source-header.txt
@@ -0,0 +1,13 @@
+Copyright 2023-2024 Project Tsurugi.
+
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+
+    http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.
\ No newline at end of file
diff --git a/modules/tgsql/core/build.gradle b/modules/tgsql/core/build.gradle
index fdbd748..aa51510 100644
--- a/modules/tgsql/core/build.gradle
+++ b/modules/tgsql/core/build.gradle
@@ -39,3 +39,6 @@ test {
     systemProperty 'tanzawa.dot', findProperty('tanzawa.dot') ?: ''
 }
 
+tasks.licenseMain {
+    dependsOn 'generateJflex'
+}