diff --git a/LICENSE b/LICENSE
index 956664a..36beaa8 100644
--- a/LICENSE
+++ b/LICENSE
@@ -1,6 +1,6 @@
 MIT License
 
-Copyright (c) 2022 Smart Swimmingpool
+Copyright (c) 2018-2026 Smart Swimming Pool, Stephan Strittmatter
 
 Permission is hereby granted, free of charge, to any person obtaining a copy
 of this software and associated documentation files (the "Software"), to deal
diff --git a/src/PoolController.py b/src/PoolController.py
index 5018736..d2606b0 100644
--- a/src/PoolController.py
+++ b/src/PoolController.py
@@ -1,3 +1,7 @@
+# Copyright (c) 2018-2026 Smart Swimming Pool, Stephan Strittmatter
+#
+# SPDX-License-Identifier: MIT
+
 import logging
 import machine
 import time
diff --git a/src/boot.py b/src/boot.py
index 6243a0e..1a54667 100644
--- a/src/boot.py
+++ b/src/boot.py
@@ -1,3 +1,7 @@
+# Copyright (c) 2018-2026 Smart Swimming Pool, Stephan Strittmatter
+#
+# SPDX-License-Identifier: MIT
+
 # This file is executed on every boot (including wake-boot from deepsleep)
 # import esp
 # esp.osdebug(None)
diff --git a/src/main.py b/src/main.py
index bb20557..89d10b3 100644
--- a/src/main.py
+++ b/src/main.py
@@ -1,3 +1,7 @@
+# Copyright (c) 2018-2026 Smart Swimming Pool, Stephan Strittmatter
+#
+# SPDX-License-Identifier: MIT
+
 import logging
 import time
 
diff --git a/src/setup/installer.py b/src/setup/installer.py
index 6e3db50..3450273 100644
--- a/src/setup/installer.py
+++ b/src/setup/installer.py
@@ -1,3 +1,7 @@
+# Copyright (c) 2018-2026 Smart Swimming Pool, Stephan Strittmatter
+#
+# SPDX-License-Identifier: MIT
+
 import mip
 
 class Installer:
diff --git a/src/timesync.py b/src/timesync.py
index f6b621d..d8e9e56 100644
--- a/src/timesync.py
+++ b/src/timesync.py
@@ -1,3 +1,7 @@
+# Copyright (c) 2018-2026 Smart Swimming Pool, Stephan Strittmatter
+#
+# SPDX-License-Identifier: MIT
+
 # Adapted from official ntptime by Peter Hinch July 2022
 # The main aim is portability:
 # Detects host device's epoch and returns time relative to that.
diff --git a/src/utils.py b/src/utils.py
index 95fc1e3..e0202fd 100644
--- a/src/utils.py
+++ b/src/utils.py
@@ -1,3 +1,7 @@
+# Copyright (c) 2018-2026 Smart Swimming Pool, Stephan Strittmatter
+#
+# SPDX-License-Identifier: MIT
+
 import os
 
 def does_fs_entry_exists(filename: str) -> bool: