diff --git a/core/src/main/java/eu/mulk/quarkus/googlecloud/jsonlogging/Formatter.java b/core/src/main/java/eu/mulk/quarkus/googlecloud/jsonlogging/Formatter.java
index e759ff0..f6167f6 100644
--- a/core/src/main/java/eu/mulk/quarkus/googlecloud/jsonlogging/Formatter.java
+++ b/core/src/main/java/eu/mulk/quarkus/googlecloud/jsonlogging/Formatter.java
@@ -1,3 +1,7 @@
+// SPDX-FileCopyrightText: © 2021 Matthias Andreas Benkard <code@mail.matthias.benkard.de>
+//
+// SPDX-License-Identifier: LGPL-3.0-or-later
+
 package eu.mulk.quarkus.googlecloud.jsonlogging;
 
 import java.io.PrintWriter;
diff --git a/core/src/main/java/eu/mulk/quarkus/googlecloud/jsonlogging/KeyValueParameter.java b/core/src/main/java/eu/mulk/quarkus/googlecloud/jsonlogging/KeyValueParameter.java
index a5924b4..d8ab58d 100644
--- a/core/src/main/java/eu/mulk/quarkus/googlecloud/jsonlogging/KeyValueParameter.java
+++ b/core/src/main/java/eu/mulk/quarkus/googlecloud/jsonlogging/KeyValueParameter.java
@@ -1,3 +1,7 @@
+// SPDX-FileCopyrightText: © 2021 Matthias Andreas Benkard <code@mail.matthias.benkard.de>
+//
+// SPDX-License-Identifier: LGPL-3.0-or-later
+
 package eu.mulk.quarkus.googlecloud.jsonlogging;
 
 import java.math.BigDecimal;
diff --git a/core/src/main/java/eu/mulk/quarkus/googlecloud/jsonlogging/Label.java b/core/src/main/java/eu/mulk/quarkus/googlecloud/jsonlogging/Label.java
index 33664dd..b46862e 100644
--- a/core/src/main/java/eu/mulk/quarkus/googlecloud/jsonlogging/Label.java
+++ b/core/src/main/java/eu/mulk/quarkus/googlecloud/jsonlogging/Label.java
@@ -1,3 +1,7 @@
+// SPDX-FileCopyrightText: © 2021 Matthias Andreas Benkard <code@mail.matthias.benkard.de>
+//
+// SPDX-License-Identifier: LGPL-3.0-or-later
+
 package eu.mulk.quarkus.googlecloud.jsonlogging;
 
 import java.util.Objects;
diff --git a/core/src/main/java/eu/mulk/quarkus/googlecloud/jsonlogging/LabelProvider.java b/core/src/main/java/eu/mulk/quarkus/googlecloud/jsonlogging/LabelProvider.java
index 8cf87db..0588fbb 100644
--- a/core/src/main/java/eu/mulk/quarkus/googlecloud/jsonlogging/LabelProvider.java
+++ b/core/src/main/java/eu/mulk/quarkus/googlecloud/jsonlogging/LabelProvider.java
@@ -1,3 +1,7 @@
+// SPDX-FileCopyrightText: © 2021 Matthias Andreas Benkard <code@mail.matthias.benkard.de>
+//
+// SPDX-License-Identifier: LGPL-3.0-or-later
+
 package eu.mulk.quarkus.googlecloud.jsonlogging;
 
 import java.util.Collection;
diff --git a/core/src/main/java/eu/mulk/quarkus/googlecloud/jsonlogging/LogEntry.java b/core/src/main/java/eu/mulk/quarkus/googlecloud/jsonlogging/LogEntry.java
index d108c81..dec18b2 100644
--- a/core/src/main/java/eu/mulk/quarkus/googlecloud/jsonlogging/LogEntry.java
+++ b/core/src/main/java/eu/mulk/quarkus/googlecloud/jsonlogging/LogEntry.java
@@ -1,3 +1,7 @@
+// SPDX-FileCopyrightText: © 2021 Matthias Andreas Benkard <code@mail.matthias.benkard.de>
+//
+// SPDX-License-Identifier: LGPL-3.0-or-later
+
 package eu.mulk.quarkus.googlecloud.jsonlogging;
 
 import io.smallrye.common.constraint.Nullable;
diff --git a/core/src/main/java/eu/mulk/quarkus/googlecloud/jsonlogging/StructuredParameter.java b/core/src/main/java/eu/mulk/quarkus/googlecloud/jsonlogging/StructuredParameter.java
index c718080..9bc3c11 100644
--- a/core/src/main/java/eu/mulk/quarkus/googlecloud/jsonlogging/StructuredParameter.java
+++ b/core/src/main/java/eu/mulk/quarkus/googlecloud/jsonlogging/StructuredParameter.java
@@ -1,3 +1,7 @@
+// SPDX-FileCopyrightText: © 2021 Matthias Andreas Benkard <code@mail.matthias.benkard.de>
+//
+// SPDX-License-Identifier: LGPL-3.0-or-later
+
 package eu.mulk.quarkus.googlecloud.jsonlogging;
 
 import javax.json.JsonObjectBuilder;
diff --git a/core/src/main/java/eu/mulk/quarkus/googlecloud/jsonlogging/StructuredParameterProvider.java b/core/src/main/java/eu/mulk/quarkus/googlecloud/jsonlogging/StructuredParameterProvider.java
index decf937..70bdce6 100644
--- a/core/src/main/java/eu/mulk/quarkus/googlecloud/jsonlogging/StructuredParameterProvider.java
+++ b/core/src/main/java/eu/mulk/quarkus/googlecloud/jsonlogging/StructuredParameterProvider.java
@@ -1,3 +1,7 @@
+// SPDX-FileCopyrightText: © 2021 Matthias Andreas Benkard <code@mail.matthias.benkard.de>
+//
+// SPDX-License-Identifier: LGPL-3.0-or-later
+
 package eu.mulk.quarkus.googlecloud.jsonlogging;
 
 /**
diff --git a/core/src/main/java/eu/mulk/quarkus/googlecloud/jsonlogging/logmanager/DefaultConsoleHandler.java b/core/src/main/java/eu/mulk/quarkus/googlecloud/jsonlogging/logmanager/DefaultConsoleHandler.java
index a1dbde7..475a15d 100644
--- a/core/src/main/java/eu/mulk/quarkus/googlecloud/jsonlogging/logmanager/DefaultConsoleHandler.java
+++ b/core/src/main/java/eu/mulk/quarkus/googlecloud/jsonlogging/logmanager/DefaultConsoleHandler.java
@@ -1,3 +1,7 @@
+// SPDX-FileCopyrightText: © 2021 Matthias Andreas Benkard <code@mail.matthias.benkard.de>
+//
+// SPDX-License-Identifier: LGPL-3.0-or-later
+
 package eu.mulk.quarkus.googlecloud.jsonlogging.logmanager;
 
 import eu.mulk.quarkus.googlecloud.jsonlogging.Formatter;
diff --git a/core/src/main/java/eu/mulk/quarkus/googlecloud/jsonlogging/logmanager/DefaultEmbeddedConfigurator.java b/core/src/main/java/eu/mulk/quarkus/googlecloud/jsonlogging/logmanager/DefaultEmbeddedConfigurator.java
index 8d9d4d8..e2ad986 100644
--- a/core/src/main/java/eu/mulk/quarkus/googlecloud/jsonlogging/logmanager/DefaultEmbeddedConfigurator.java
+++ b/core/src/main/java/eu/mulk/quarkus/googlecloud/jsonlogging/logmanager/DefaultEmbeddedConfigurator.java
@@ -1,3 +1,7 @@
+// SPDX-FileCopyrightText: © 2021 Matthias Andreas Benkard <code@mail.matthias.benkard.de>
+//
+// SPDX-License-Identifier: LGPL-3.0-or-later
+
 package eu.mulk.quarkus.googlecloud.jsonlogging.logmanager;
 
 import eu.mulk.quarkus.googlecloud.jsonlogging.Formatter;
diff --git a/core/src/main/java/eu/mulk/quarkus/googlecloud/jsonlogging/logmanager/package-info.java b/core/src/main/java/eu/mulk/quarkus/googlecloud/jsonlogging/logmanager/package-info.java
index 87eb71e..3b6f38c 100644
--- a/core/src/main/java/eu/mulk/quarkus/googlecloud/jsonlogging/logmanager/package-info.java
+++ b/core/src/main/java/eu/mulk/quarkus/googlecloud/jsonlogging/logmanager/package-info.java
@@ -1,3 +1,7 @@
+// SPDX-FileCopyrightText: © 2021 Matthias Andreas Benkard <code@mail.matthias.benkard.de>
+//
+// SPDX-License-Identifier: LGPL-3.0-or-later
+
 /**
  * Integration with JBoss Log Manager and {@link java.util.logging}.
  *
diff --git a/core/src/main/java/eu/mulk/quarkus/googlecloud/jsonlogging/package-info.java b/core/src/main/java/eu/mulk/quarkus/googlecloud/jsonlogging/package-info.java
index e684bfd..8f8e495 100644
--- a/core/src/main/java/eu/mulk/quarkus/googlecloud/jsonlogging/package-info.java
+++ b/core/src/main/java/eu/mulk/quarkus/googlecloud/jsonlogging/package-info.java
@@ -1,3 +1,7 @@
+// SPDX-FileCopyrightText: © 2021 Matthias Andreas Benkard <code@mail.matthias.benkard.de>
+//
+// SPDX-License-Identifier: LGPL-3.0-or-later
+
 /**
  * Provides structured logging to standard output according to the Google Cloud Logging
  * specification.