diff --git a/websocket_server/app.js b/websocket_server/app.js
index f55880f..9666b9f 100644
--- a/websocket_server/app.js
+++ b/websocket_server/app.js
@@ -1,3 +1,8 @@
+/**
+ * SPDX-FileCopyrightText: 2024 Nextcloud GmbH and Nextcloud contributors
+ * SPDX-License-Identifier: AGPL-3.0-or-later
+ */
+
 import express from 'express'
 
 const app = express()
diff --git a/websocket_server/roomData.js b/websocket_server/roomData.js
index 3f77bce..6354fdd 100644
--- a/websocket_server/roomData.js
+++ b/websocket_server/roomData.js
@@ -1,5 +1,10 @@
 /* eslint-disable no-console */
 
+/**
+ * SPDX-FileCopyrightText: 2024 Nextcloud GmbH and Nextcloud contributors
+ * SPDX-License-Identifier: AGPL-3.0-or-later
+ */
+
 import fetch from 'node-fetch'
 import dotenv from 'dotenv'
 
diff --git a/websocket_server/server.js b/websocket_server/server.js
index 2e90ade..1ac4c40 100644
--- a/websocket_server/server.js
+++ b/websocket_server/server.js
@@ -1,6 +1,11 @@
 /* eslint-disable no-console */
 /* eslint-disable n/no-process-exit */
 
+/**
+ * SPDX-FileCopyrightText: 2024 Nextcloud GmbH and Nextcloud contributors
+ * SPDX-License-Identifier: AGPL-3.0-or-later
+ */
+
 import http from 'http'
 import https from 'https'
 import fs from 'fs'
diff --git a/websocket_server/socket.js b/websocket_server/socket.js
index f1c30bf..4c2d7bc 100644
--- a/websocket_server/socket.js
+++ b/websocket_server/socket.js
@@ -1,5 +1,10 @@
 /* eslint-disable no-console */
 
+/**
+ * SPDX-FileCopyrightText: 2024 Nextcloud GmbH and Nextcloud contributors
+ * SPDX-License-Identifier: AGPL-3.0-or-later
+ */
+
 import { Server as SocketIO } from 'socket.io'
 import jwt from 'jsonwebtoken'
 import { getRoomDataFromFile, roomDataStore, saveRoomDataToFile } from './roomData.js'
diff --git a/websocket_server/utils.js b/websocket_server/utils.js
index 2906b3d..31abcd7 100644
--- a/websocket_server/utils.js
+++ b/websocket_server/utils.js
@@ -1,3 +1,8 @@
+/**
+ * SPDX-FileCopyrightText: 2024 Nextcloud GmbH and Nextcloud contributors
+ * SPDX-License-Identifier: AGPL-3.0-or-later
+ */
+
 export const convertStringToArrayBuffer = (string) => new TextEncoder().encode(string).buffer
 export const convertArrayBufferToString = (arrayBuffer) => new TextDecoder().decode(arrayBuffer)
 export const parseBooleanFromEnv = (value) => value === 'true'