diff --git a/README.md b/README.md
index eff2f4e..958d6bb 100644
--- a/README.md
+++ b/README.md
@@ -1,3 +1,5 @@
+<!--- Copyright (C) from 2022 The Play Framework Contributors <https://github.com/playframework>, 2011-2021 Lightbend Inc. <https://www.lightbend.com> -->
+
 # play-doc
 
 [![Twitter Follow](https://img.shields.io/twitter/follow/playframework?label=follow&style=flat&logo=twitter&color=brightgreen)](https://twitter.com/playframework)
diff --git a/build.sbt b/build.sbt
index 99eaa92..40400b0 100644
--- a/build.sbt
+++ b/build.sbt
@@ -1,3 +1,9 @@
+// Copyright (C) from 2022 The Play Framework Contributors <https://github.com/playframework>, 2011-2021 Lightbend Inc. <https://www.lightbend.com>
+
+import de.heikoseeberger.sbtheader.HeaderPlugin.autoImport.HeaderPattern.commentBetween
+import de.heikoseeberger.sbtheader.CommentStyle
+import de.heikoseeberger.sbtheader.FileType
+import de.heikoseeberger.sbtheader.LineCommentCreator
 // Customise sbt-dynver's behaviour to make it work with tags which aren't v-prefixed
 (ThisBuild / dynverVTagPrefix) := false
 
@@ -9,7 +15,7 @@ Global / onLoad := (Global / onLoad).value.andThen { s =>
 }
 
 lazy val `play-doc` = (project in file("."))
-  .enablePlugins(Omnidoc, SbtTwirl)
+  .enablePlugins(Omnidoc, SbtTwirl, HeaderPlugin)
   .settings(
     organization         := "org.playframework",
     organizationName     := "The Play Framework Project",
@@ -23,7 +29,23 @@ lazy val `play-doc` = (project in file("."))
       "contact@playframework.com",
       url("https://github.com/playframework")
     ),
-    pomIncludeRepository := { _ => false },
+    headerLicense := Some(
+      HeaderLicense.Custom(
+        "Copyright (C) from 2022 The Play Framework Contributors <https://github.com/playframework>, 2011-2021 Lightbend Inc. <https://www.lightbend.com>"
+      )
+    ),
+    headerMappings ++= Map(
+      FileType("sbt")        -> HeaderCommentStyle.cppStyleLineComment,
+      FileType("properties") -> HeaderCommentStyle.hashLineComment,
+      FileType("md") -> CommentStyle(new LineCommentCreator("<!---", "-->"), commentBetween("<!---", "*", "-->"))
+    ),
+    (Compile / headerSources) ++=
+      ((baseDirectory.value ** ("*.properties" || "*.md" || "*.sbt"))
+        --- (baseDirectory.value ** "target" ** "*")
+        --- (baseDirectory.value / "src/test/resources" ** "*")).get ++
+        (baseDirectory.value / "project" ** "*.scala" --- (baseDirectory.value ** "target" ** "*")).get,
+    (Test / headerResources) := Seq(),
+    pomIncludeRepository     := { _ => false },
     scalacOptions ++= {
       CrossVersion.partialVersion(scalaVersion.value) match {
         case Some((2, _)) =>
@@ -71,6 +93,7 @@ scalacOptions ++= Seq(
 addCommandAlias(
   "validateCode",
   List(
+    "headerCheckAll",
     "scalafmtSbtCheck",
     "scalafmtCheckAll",
   ).mkString(";")
diff --git a/project/Omnidoc.scala b/project/Omnidoc.scala
index 1ee7e79..7eacbb6 100644
--- a/project/Omnidoc.scala
+++ b/project/Omnidoc.scala
@@ -1,3 +1,7 @@
+/*
+ * Copyright (C) from 2022 The Play Framework Contributors <https://github.com/playframework>, 2011-2021 Lightbend Inc. <https://www.lightbend.com>
+ */
+
 import sbt._
 import sbt.Keys._
 import sbt.Package.ManifestAttributes
diff --git a/project/build.properties b/project/build.properties
index e8a1e24..a47b4b2 100644
--- a/project/build.properties
+++ b/project/build.properties
@@ -1 +1,3 @@
+# Copyright (C) from 2022 The Play Framework Contributors <https://github.com/playframework>, 2011-2021 Lightbend Inc. <https://www.lightbend.com>
+
 sbt.version=1.9.7
diff --git a/project/plugins.sbt b/project/plugins.sbt
index f3d9684..a3b1e20 100644
--- a/project/plugins.sbt
+++ b/project/plugins.sbt
@@ -1,3 +1,6 @@
+// Copyright (C) from 2022 The Play Framework Contributors <https://github.com/playframework>, 2011-2021 Lightbend Inc. <https://www.lightbend.com>
+
 addSbtPlugin("org.playframework.twirl" % "sbt-twirl"      % "2.0.1")
 addSbtPlugin("org.scalameta"           % "sbt-scalafmt"   % "2.5.2")
 addSbtPlugin("com.github.sbt"          % "sbt-ci-release" % "1.5.12")
+addSbtPlugin("de.heikoseeberger"       % "sbt-header"     % "5.10.0")
diff --git a/src/main/java/play/doc/CodeReferenceNode.java b/src/main/java/play/doc/CodeReferenceNode.java
index 777433c..897341c 100644
--- a/src/main/java/play/doc/CodeReferenceNode.java
+++ b/src/main/java/play/doc/CodeReferenceNode.java
@@ -1,3 +1,7 @@
+/*
+ * Copyright (C) from 2022 The Play Framework Contributors <https://github.com/playframework>, 2011-2021 Lightbend Inc. <https://www.lightbend.com>
+ */
+
 package play.doc;
 
 import org.pegdown.ast.AbstractNode;
diff --git a/src/main/java/play/doc/CodeReferenceParser.java b/src/main/java/play/doc/CodeReferenceParser.java
index 3616f79..d86e18b 100644
--- a/src/main/java/play/doc/CodeReferenceParser.java
+++ b/src/main/java/play/doc/CodeReferenceParser.java
@@ -1,3 +1,7 @@
+/*
+ * Copyright (C) from 2022 The Play Framework Contributors <https://github.com/playframework>, 2011-2021 Lightbend Inc. <https://www.lightbend.com>
+ */
+
 package play.doc;
 
 import org.parboiled.Rule;
diff --git a/src/main/java/play/doc/TocNode.java b/src/main/java/play/doc/TocNode.java
index d90d77a..31f9a32 100644
--- a/src/main/java/play/doc/TocNode.java
+++ b/src/main/java/play/doc/TocNode.java
@@ -1,3 +1,7 @@
+/*
+ * Copyright (C) from 2022 The Play Framework Contributors <https://github.com/playframework>, 2011-2021 Lightbend Inc. <https://www.lightbend.com>
+ */
+
 package play.doc;
 
 import org.pegdown.ast.AbstractNode;
diff --git a/src/main/java/play/doc/TocParser.java b/src/main/java/play/doc/TocParser.java
index 01406e2..8d5a5a2 100644
--- a/src/main/java/play/doc/TocParser.java
+++ b/src/main/java/play/doc/TocParser.java
@@ -1,3 +1,7 @@
+/*
+ * Copyright (C) from 2022 The Play Framework Contributors <https://github.com/playframework>, 2011-2021 Lightbend Inc. <https://www.lightbend.com>
+ */
+
 package play.doc;
 
 import org.parboiled.Rule;
diff --git a/src/main/java/play/doc/VariableNode.java b/src/main/java/play/doc/VariableNode.java
index be7e11c..123e71a 100644
--- a/src/main/java/play/doc/VariableNode.java
+++ b/src/main/java/play/doc/VariableNode.java
@@ -1,3 +1,7 @@
+/*
+ * Copyright (C) from 2022 The Play Framework Contributors <https://github.com/playframework>, 2011-2021 Lightbend Inc. <https://www.lightbend.com>
+ */
+
 package play.doc;
 
 import org.pegdown.ast.AbstractNode;
diff --git a/src/main/java/play/doc/VariableParser.java b/src/main/java/play/doc/VariableParser.java
index 7cbdb2a..3e4e06a 100644
--- a/src/main/java/play/doc/VariableParser.java
+++ b/src/main/java/play/doc/VariableParser.java
@@ -1,3 +1,7 @@
+/*
+ * Copyright (C) from 2022 The Play Framework Contributors <https://github.com/playframework>, 2011-2021 Lightbend Inc. <https://www.lightbend.com>
+ */
+
 package play.doc;
 
 import org.parboiled.Rule;
diff --git a/src/main/scala/play/doc/FileRepository.scala b/src/main/scala/play/doc/FileRepository.scala
index 14aa878..c277bf9 100644
--- a/src/main/scala/play/doc/FileRepository.scala
+++ b/src/main/scala/play/doc/FileRepository.scala
@@ -1,3 +1,7 @@
+/*
+ * Copyright (C) from 2022 The Play Framework Contributors <https://github.com/playframework>, 2011-2021 Lightbend Inc. <https://www.lightbend.com>
+ */
+
 package play.doc
 
 import java.io.FileInputStream
diff --git a/src/main/scala/play/doc/PageIndex.scala b/src/main/scala/play/doc/PageIndex.scala
index 0a1b257..5325a87 100644
--- a/src/main/scala/play/doc/PageIndex.scala
+++ b/src/main/scala/play/doc/PageIndex.scala
@@ -1,3 +1,7 @@
+/*
+ * Copyright (C) from 2022 The Play Framework Contributors <https://github.com/playframework>, 2011-2021 Lightbend Inc. <https://www.lightbend.com>
+ */
+
 package play.doc
 
 import org.apache.commons.io.IOUtils
diff --git a/src/main/scala/play/doc/PlayDoc.scala b/src/main/scala/play/doc/PlayDoc.scala
index 21364b2..d4526f2 100644
--- a/src/main/scala/play/doc/PlayDoc.scala
+++ b/src/main/scala/play/doc/PlayDoc.scala
@@ -1,3 +1,7 @@
+/*
+ * Copyright (C) from 2022 The Play Framework Contributors <https://github.com/playframework>, 2011-2021 Lightbend Inc. <https://www.lightbend.com>
+ */
+
 package play.doc
 
 import java.io.InputStream
diff --git a/src/main/scala/play/doc/PlayDocTemplates.scala b/src/main/scala/play/doc/PlayDocTemplates.scala
index 8a73f77..125f15a 100644
--- a/src/main/scala/play/doc/PlayDocTemplates.scala
+++ b/src/main/scala/play/doc/PlayDocTemplates.scala
@@ -1,3 +1,7 @@
+/*
+ * Copyright (C) from 2022 The Play Framework Contributors <https://github.com/playframework>, 2011-2021 Lightbend Inc. <https://www.lightbend.com>
+ */
+
 package play.doc
 
 /**
diff --git a/src/main/scala/play/doc/PrettifyVerbatimSerializer.scala b/src/main/scala/play/doc/PrettifyVerbatimSerializer.scala
index 87b109d..96a32e7 100644
--- a/src/main/scala/play/doc/PrettifyVerbatimSerializer.scala
+++ b/src/main/scala/play/doc/PrettifyVerbatimSerializer.scala
@@ -1,3 +1,7 @@
+/*
+ * Copyright (C) from 2022 The Play Framework Contributors <https://github.com/playframework>, 2011-2021 Lightbend Inc. <https://www.lightbend.com>
+ */
+
 package play.doc
 
 import org.pegdown.Printer
diff --git a/src/test/scala/play/doc/FileRepositorySpec.scala b/src/test/scala/play/doc/FileRepositorySpec.scala
index 7a6f122..439132d 100644
--- a/src/test/scala/play/doc/FileRepositorySpec.scala
+++ b/src/test/scala/play/doc/FileRepositorySpec.scala
@@ -1,3 +1,7 @@
+/*
+ * Copyright (C) from 2022 The Play Framework Contributors <https://github.com/playframework>, 2011-2021 Lightbend Inc. <https://www.lightbend.com>
+ */
+
 package play.doc
 
 import org.specs2.mutable.Specification
diff --git a/src/test/scala/play/doc/PageIndexSpec.scala b/src/test/scala/play/doc/PageIndexSpec.scala
index 14ee236..93b3c9c 100644
--- a/src/test/scala/play/doc/PageIndexSpec.scala
+++ b/src/test/scala/play/doc/PageIndexSpec.scala
@@ -1,3 +1,7 @@
+/*
+ * Copyright (C) from 2022 The Play Framework Contributors <https://github.com/playframework>, 2011-2021 Lightbend Inc. <https://www.lightbend.com>
+ */
+
 package play.doc
 
 import java.io.File
diff --git a/src/test/scala/play/doc/PlayDocSpec.scala b/src/test/scala/play/doc/PlayDocSpec.scala
index 113bca3..00f4d2f 100644
--- a/src/test/scala/play/doc/PlayDocSpec.scala
+++ b/src/test/scala/play/doc/PlayDocSpec.scala
@@ -1,3 +1,7 @@
+/*
+ * Copyright (C) from 2022 The Play Framework Contributors <https://github.com/playframework>, 2011-2021 Lightbend Inc. <https://www.lightbend.com>
+ */
+
 package play.doc
 
 import org.specs2.mutable._