diff --git a/build.sbt b/build.sbt
index 9f6777a73e..456096ce54 100644
--- a/build.sbt
+++ b/build.sbt
@@ -24,7 +24,14 @@ lazy val aggregatedProjects: Seq[ProjectReference] = Seq(webapi, sipi)
 
 lazy val buildSettings = Seq(
   organization := "org.knora",
-  version      := (ThisBuild / version).value
+  version      := (ThisBuild / version).value,
+  headerLicense := Some(
+    HeaderLicense.Custom(
+      """|Copyright © 2021 - 2022 Swiss National Data and Service Center for the Humanities and/or DaSCH Service Platform contributors.
+         |SPDX-License-Identifier: Apache-2.0
+         |""".stripMargin
+    )
+  )
 )
 
 lazy val rootBaseDir = ThisBuild / baseDirectory
diff --git a/project/plugins.sbt b/project/plugins.sbt
index a650908304..90c32f31e4 100644
--- a/project/plugins.sbt
+++ b/project/plugins.sbt
@@ -16,6 +16,7 @@ addSbtPlugin("org.scoverage"     % "sbt-scoverage"       % "1.9.3")
 addSbtPlugin("com.eed3si9n"      % "sbt-buildinfo"       % "0.11.0")
 addSbtPlugin("org.scalameta"     % "sbt-scalafmt"        % "2.5.0")
 addSbtPlugin("ch.epfl.scala"     % "sbt-scalafix"        % "0.10.4")
+addSbtPlugin("de.heikoseeberger" % "sbt-header"          % "5.9.0")
 
 // ad-hoc plugins - uncomment on demenad and keep it commented out in main branch
 
diff --git a/webapi/src/main/scala/org/knora/webapi/Main.scala b/webapi/src/main/scala/org/knora/webapi/Main.scala
index 2b123f8ffb..a69d02220c 100644
--- a/webapi/src/main/scala/org/knora/webapi/Main.scala
+++ b/webapi/src/main/scala/org/knora/webapi/Main.scala
@@ -2,6 +2,7 @@
  * Copyright © 2021 - 2022 Swiss National Data and Service Center for the Humanities and/or DaSCH Service Platform contributors.
  * SPDX-License-Identifier: Apache-2.0
  */
+
 package org.knora.webapi
 
 import zio._
diff --git a/webapi/src/main/scala/org/knora/webapi/auth/JWTService.scala b/webapi/src/main/scala/org/knora/webapi/auth/JWTService.scala
index a28ac84bfb..d750296bf8 100644
--- a/webapi/src/main/scala/org/knora/webapi/auth/JWTService.scala
+++ b/webapi/src/main/scala/org/knora/webapi/auth/JWTService.scala
@@ -1,3 +1,8 @@
+/*
+ * Copyright © 2021 - 2022 Swiss National Data and Service Center for the Humanities and/or DaSCH Service Platform contributors.
+ * SPDX-License-Identifier: Apache-2.0
+ */
+
 package org.knora.webapi.auth
 
 import spray.json.JsValue
diff --git a/webapi/src/main/scala/org/knora/webapi/config/AppConfig.scala b/webapi/src/main/scala/org/knora/webapi/config/AppConfig.scala
index be2cefc9c4..10d9bfc56d 100644
--- a/webapi/src/main/scala/org/knora/webapi/config/AppConfig.scala
+++ b/webapi/src/main/scala/org/knora/webapi/config/AppConfig.scala
@@ -1,3 +1,8 @@
+/*
+ * Copyright © 2021 - 2022 Swiss National Data and Service Center for the Humanities and/or DaSCH Service Platform contributors.
+ * SPDX-License-Identifier: Apache-2.0
+ */
+
 package org.knora.webapi.config
 
 import com.typesafe.config.ConfigFactory
diff --git a/webapi/src/main/scala/org/knora/webapi/core/HttpServerWithZIOHttp.scala b/webapi/src/main/scala/org/knora/webapi/core/HttpServerWithZIOHttp.scala
index 480c451366..8f05108009 100644
--- a/webapi/src/main/scala/org/knora/webapi/core/HttpServerWithZIOHttp.scala
+++ b/webapi/src/main/scala/org/knora/webapi/core/HttpServerWithZIOHttp.scala
@@ -1,3 +1,8 @@
+/*
+ * Copyright © 2021 - 2022 Swiss National Data and Service Center for the Humanities and/or DaSCH Service Platform contributors.
+ * SPDX-License-Identifier: Apache-2.0
+ */
+
 package org.knora.webapi.core
 
 import zhttp.service.Server
diff --git a/webapi/src/main/scala/org/knora/webapi/core/LayersLive.scala b/webapi/src/main/scala/org/knora/webapi/core/LayersLive.scala
index 4b529ec470..b7334aa838 100644
--- a/webapi/src/main/scala/org/knora/webapi/core/LayersLive.scala
+++ b/webapi/src/main/scala/org/knora/webapi/core/LayersLive.scala
@@ -1,3 +1,8 @@
+/*
+ * Copyright © 2021 - 2022 Swiss National Data and Service Center for the Humanities and/or DaSCH Service Platform contributors.
+ * SPDX-License-Identifier: Apache-2.0
+ */
+
 package org.knora.webapi.core
 
 import zio.ULayer
diff --git a/webapi/src/main/scala/org/knora/webapi/messages/v2/responder/resourcemessages/resourceAndValueEventsUtil.scala b/webapi/src/main/scala/org/knora/webapi/messages/v2/responder/resourcemessages/resourceAndValueEventsUtil.scala
index 6429e86877..1fe034ad28 100644
--- a/webapi/src/main/scala/org/knora/webapi/messages/v2/responder/resourcemessages/resourceAndValueEventsUtil.scala
+++ b/webapi/src/main/scala/org/knora/webapi/messages/v2/responder/resourcemessages/resourceAndValueEventsUtil.scala
@@ -1,3 +1,8 @@
+/*
+ * Copyright © 2021 - 2022 Swiss National Data and Service Center for the Humanities and/or DaSCH Service Platform contributors.
+ * SPDX-License-Identifier: Apache-2.0
+ */
+
 package org.knora.webapi.messages.v2.responder.resourcemessages
 
 /**
diff --git a/webapi/src/main/scala/org/knora/webapi/store/cache/config/CacheServiceConfig.scala b/webapi/src/main/scala/org/knora/webapi/store/cache/config/CacheServiceConfig.scala
index 9924e150ac..8d62b71dd0 100644
--- a/webapi/src/main/scala/org/knora/webapi/store/cache/config/CacheServiceConfig.scala
+++ b/webapi/src/main/scala/org/knora/webapi/store/cache/config/CacheServiceConfig.scala
@@ -1,3 +1,8 @@
+/*
+ * Copyright © 2021 - 2022 Swiss National Data and Service Center for the Humanities and/or DaSCH Service Platform contributors.
+ * SPDX-License-Identifier: Apache-2.0
+ */
+
 package org.knora.webapi.store.cache.config
 
 final case class CacheServiceConfig(enabled: Boolean, redis: RedisConfig)
diff --git a/webapi/src/main/scala/org/knora/webapi/store/iiif/api/IIIFService.scala b/webapi/src/main/scala/org/knora/webapi/store/iiif/api/IIIFService.scala
index 3c933b7d07..2137239c74 100644
--- a/webapi/src/main/scala/org/knora/webapi/store/iiif/api/IIIFService.scala
+++ b/webapi/src/main/scala/org/knora/webapi/store/iiif/api/IIIFService.scala
@@ -1,3 +1,8 @@
+/*
+ * Copyright © 2021 - 2022 Swiss National Data and Service Center for the Humanities and/or DaSCH Service Platform contributors.
+ * SPDX-License-Identifier: Apache-2.0
+ */
+
 package org.knora.webapi.store.iiif.api
 
 import zio._
diff --git a/webapi/src/main/scala/org/knora/webapi/store/iiif/domain/SipiKnoraJsonResponse.scala b/webapi/src/main/scala/org/knora/webapi/store/iiif/domain/SipiKnoraJsonResponse.scala
index 7e2aeca598..b37f610e94 100644
--- a/webapi/src/main/scala/org/knora/webapi/store/iiif/domain/SipiKnoraJsonResponse.scala
+++ b/webapi/src/main/scala/org/knora/webapi/store/iiif/domain/SipiKnoraJsonResponse.scala
@@ -1,3 +1,8 @@
+/*
+ * Copyright © 2021 - 2022 Swiss National Data and Service Center for the Humanities and/or DaSCH Service Platform contributors.
+ * SPDX-License-Identifier: Apache-2.0
+ */
+
 package org.knora.webapi.store.iiif.domain
 
 import akka.http.scaladsl.marshallers.sprayjson.SprayJsonSupport
diff --git a/webapi/src/main/scala/org/knora/webapi/store/iiif/errors/Errors.scala b/webapi/src/main/scala/org/knora/webapi/store/iiif/errors/Errors.scala
index 9ffdf554a7..195db325b2 100644
--- a/webapi/src/main/scala/org/knora/webapi/store/iiif/errors/Errors.scala
+++ b/webapi/src/main/scala/org/knora/webapi/store/iiif/errors/Errors.scala
@@ -1,3 +1,8 @@
+/*
+ * Copyright © 2021 - 2022 Swiss National Data and Service Center for the Humanities and/or DaSCH Service Platform contributors.
+ * SPDX-License-Identifier: Apache-2.0
+ */
+
 package org.knora.webapi.store.iiif.errors
 
 import com.typesafe.scalalogging.Logger
diff --git a/webapi/src/main/scala/org/knora/webapi/store/triplestore/api/TriplestoreService.scala b/webapi/src/main/scala/org/knora/webapi/store/triplestore/api/TriplestoreService.scala
index f6a92da946..ce5fe8db70 100644
--- a/webapi/src/main/scala/org/knora/webapi/store/triplestore/api/TriplestoreService.scala
+++ b/webapi/src/main/scala/org/knora/webapi/store/triplestore/api/TriplestoreService.scala
@@ -1,3 +1,8 @@
+/*
+ * Copyright © 2021 - 2022 Swiss National Data and Service Center for the Humanities and/or DaSCH Service Platform contributors.
+ * SPDX-License-Identifier: Apache-2.0
+ */
+
 package org.knora.webapi.store.triplestore.api
 
 import zio._
diff --git a/webapi/src/main/scala/org/knora/webapi/store/triplestore/defaults/DefaultRdfData.scala b/webapi/src/main/scala/org/knora/webapi/store/triplestore/defaults/DefaultRdfData.scala
index ee133b2b70..e99622f957 100644
--- a/webapi/src/main/scala/org/knora/webapi/store/triplestore/defaults/DefaultRdfData.scala
+++ b/webapi/src/main/scala/org/knora/webapi/store/triplestore/defaults/DefaultRdfData.scala
@@ -1,3 +1,8 @@
+/*
+ * Copyright © 2021 - 2022 Swiss National Data and Service Center for the Humanities and/or DaSCH Service Platform contributors.
+ * SPDX-License-Identifier: Apache-2.0
+ */
+
 package org.knora.webapi.store.triplestore.defaults
 
 import zio.NonEmptyChunk
diff --git a/webapi/src/main/scala/org/knora/webapi/store/triplestore/errors/Errors.scala b/webapi/src/main/scala/org/knora/webapi/store/triplestore/errors/Errors.scala
index 0c57df6e58..1d36c1c6a8 100644
--- a/webapi/src/main/scala/org/knora/webapi/store/triplestore/errors/Errors.scala
+++ b/webapi/src/main/scala/org/knora/webapi/store/triplestore/errors/Errors.scala
@@ -1,3 +1,8 @@
+/*
+ * Copyright © 2021 - 2022 Swiss National Data and Service Center for the Humanities and/or DaSCH Service Platform contributors.
+ * SPDX-License-Identifier: Apache-2.0
+ */
+
 package org.knora.webapi.store.triplestore.errors
 
 import com.typesafe.scalalogging.Logger
diff --git a/webapi/src/main/scala/org/knora/webapi/store/triplestore/upgrade/RepositoryUpdatePlan.scala b/webapi/src/main/scala/org/knora/webapi/store/triplestore/upgrade/RepositoryUpdatePlan.scala
index ebcb51635e..25d82922bb 100644
--- a/webapi/src/main/scala/org/knora/webapi/store/triplestore/upgrade/RepositoryUpdatePlan.scala
+++ b/webapi/src/main/scala/org/knora/webapi/store/triplestore/upgrade/RepositoryUpdatePlan.scala
@@ -1,3 +1,8 @@
+/*
+ * Copyright © 2021 - 2022 Swiss National Data and Service Center for the Humanities and/or DaSCH Service Platform contributors.
+ * SPDX-License-Identifier: Apache-2.0
+ */
+
 package org.knora.webapi.store.triplestore.upgrade
 
 import com.typesafe.scalalogging.Logger
diff --git a/webapi/src/main/scala/org/knora/webapi/store/triplestore/upgrade/RepositoryUpdater.scala b/webapi/src/main/scala/org/knora/webapi/store/triplestore/upgrade/RepositoryUpdater.scala
index afb85f5182..41fd1d67ae 100644
--- a/webapi/src/main/scala/org/knora/webapi/store/triplestore/upgrade/RepositoryUpdater.scala
+++ b/webapi/src/main/scala/org/knora/webapi/store/triplestore/upgrade/RepositoryUpdater.scala
@@ -1,3 +1,8 @@
+/*
+ * Copyright © 2021 - 2022 Swiss National Data and Service Center for the Humanities and/or DaSCH Service Platform contributors.
+ * SPDX-License-Identifier: Apache-2.0
+ */
+
 package org.knora.webapi.store.triplestore.upgrade
 
 import com.typesafe.scalalogging.Logger
diff --git a/webapi/src/main/scala/org/knora/webapi/store/triplestore/upgrade/UpgradePlugin.scala b/webapi/src/main/scala/org/knora/webapi/store/triplestore/upgrade/UpgradePlugin.scala
index 1b41ef6199..38e1fa2f42 100644
--- a/webapi/src/main/scala/org/knora/webapi/store/triplestore/upgrade/UpgradePlugin.scala
+++ b/webapi/src/main/scala/org/knora/webapi/store/triplestore/upgrade/UpgradePlugin.scala
@@ -1,3 +1,8 @@
+/*
+ * Copyright © 2021 - 2022 Swiss National Data and Service Center for the Humanities and/or DaSCH Service Platform contributors.
+ * SPDX-License-Identifier: Apache-2.0
+ */
+
 package org.knora.webapi.store.triplestore.upgrade
 
 import org.knora.webapi.messages.util.rdf.RdfModel
diff --git a/webapi/src/main/scala/org/knora/webapi/util/Debug.scala b/webapi/src/main/scala/org/knora/webapi/util/Debug.scala
index 94ec5e07c8..2059b0de22 100644
--- a/webapi/src/main/scala/org/knora/webapi/util/Debug.scala
+++ b/webapi/src/main/scala/org/knora/webapi/util/Debug.scala
@@ -1,3 +1,8 @@
+/*
+ * Copyright © 2021 - 2022 Swiss National Data and Service Center for the Humanities and/or DaSCH Service Platform contributors.
+ * SPDX-License-Identifier: Apache-2.0
+ */
+
 package org.knora.webapi.util
 
 /**