diff --git a/externs/lcevc.js b/externs/lcevc.js
index c816df2a33..d5cdcf20da 100644
--- a/externs/lcevc.js
+++ b/externs/lcevc.js
@@ -1,3 +1,9 @@
+/*! @license
+ * Shaka Player
+ * Copyright 2023 Google LLC
+ * SPDX-License-Identifier: Apache-2.0
+ */
+
 /**
 * @fileoverview Externs for LcevcDec
 * compiler.
diff --git a/externs/shaka/codecs.js b/externs/shaka/codecs.js
index 4ead28d7f2..faf270ab90 100644
--- a/externs/shaka/codecs.js
+++ b/externs/shaka/codecs.js
@@ -1,3 +1,9 @@
+/*! @license
+ * Shaka Player
+ * Copyright 2023 Google LLC
+ * SPDX-License-Identifier: Apache-2.0
+ */
+
 /**
  * @typedef {{
  *   data: !Uint8Array,
diff --git a/externs/shaka/transmuxer.js b/externs/shaka/transmuxer.js
index fca06fe21e..66d13379f2 100644
--- a/externs/shaka/transmuxer.js
+++ b/externs/shaka/transmuxer.js
@@ -1,3 +1,9 @@
+/*! @license
+ * Shaka Player
+ * Copyright 2023 Google LLC
+ * SPDX-License-Identifier: Apache-2.0
+ */
+
 /**
  * @fileoverview Externs for Transmuxer.
  *