diff --git a/test_apps/main/test_app_main.c b/test_apps/main/test_app_main.c
index 1f8d4f9..b733c76 100644
--- a/test_apps/main/test_app_main.c
+++ b/test_apps/main/test_app_main.c
@@ -1,3 +1,8 @@
+/*
+ * SPDX-FileCopyrightText: 2025 Kozmotronik Tech
+ *
+ * SPDX-License-Identifier: MIT
+ */
 
 #include <stdbool.h>
 #include "esp_log.h"
diff --git a/test_apps/main/test_common.c b/test_apps/main/test_common.c
index 87d1811..b15b6c9 100644
--- a/test_apps/main/test_common.c
+++ b/test_apps/main/test_common.c
@@ -1,3 +1,9 @@
+/*
+ * SPDX-FileCopyrightText: 2025 Kozmotronik Tech
+ *
+ * SPDX-License-Identifier: MIT
+ */
+
 #include "test_common.h"
 #include "relay_chn_ctl.h" // For resetting the channels
 #include "relay_chn_tilt.h" // For resetting tilt count
diff --git a/test_apps/main/test_common.h b/test_apps/main/test_common.h
index b2c1c55..0930f17 100644
--- a/test_apps/main/test_common.h
+++ b/test_apps/main/test_common.h
@@ -1,3 +1,9 @@
+/*
+ * SPDX-FileCopyrightText: 2025 Kozmotronik Tech
+ *
+ * SPDX-License-Identifier: MIT
+ */
+
 #pragma once
 
 #include <string.h> // For memset
diff --git a/test_apps/main/test_relay_chn_core_multi.c b/test_apps/main/test_relay_chn_core_multi.c
index 080bd5f..d8287f3 100644
--- a/test_apps/main/test_relay_chn_core_multi.c
+++ b/test_apps/main/test_relay_chn_core_multi.c
@@ -1,3 +1,9 @@
+/*
+ * SPDX-FileCopyrightText: 2025 Kozmotronik Tech
+ *
+ * SPDX-License-Identifier: MIT
+ */
+
 #include "test_common.h"
 
 relay_chn_state_t states[CONFIG_RELAY_CHN_COUNT], expect_states[CONFIG_RELAY_CHN_COUNT];
diff --git a/test_apps/main/test_relay_chn_core_single.c b/test_apps/main/test_relay_chn_core_single.c
index 171f98a..c7d4aeb 100644
--- a/test_apps/main/test_relay_chn_core_single.c
+++ b/test_apps/main/test_relay_chn_core_single.c
@@ -1,3 +1,9 @@
+/*
+ * SPDX-FileCopyrightText: 2025 Kozmotronik Tech
+ *
+ * SPDX-License-Identifier: MIT
+ */
+
 #include "test_common.h"
 
 
diff --git a/test_apps/main/test_relay_chn_notify_common.c b/test_apps/main/test_relay_chn_notify_common.c
index f033d16..33314e3 100644
--- a/test_apps/main/test_relay_chn_notify_common.c
+++ b/test_apps/main/test_relay_chn_notify_common.c
@@ -1,3 +1,9 @@
+/*
+ * SPDX-FileCopyrightText: 2025 Kozmotronik Tech
+ *
+ * SPDX-License-Identifier: MIT
+ */
+
 #include "test_relay_chn_notify_common.h"
 
 listener_callback_info_t listener1_info;
diff --git a/test_apps/main/test_relay_chn_notify_common.h b/test_apps/main/test_relay_chn_notify_common.h
index 436f4af..cd45f36 100644
--- a/test_apps/main/test_relay_chn_notify_common.h
+++ b/test_apps/main/test_relay_chn_notify_common.h
@@ -1,3 +1,9 @@
+/*
+ * SPDX-FileCopyrightText: 2025 Kozmotronik Tech
+ *
+ * SPDX-License-Identifier: MIT
+ */
+
 #pragma once
 
 #include "test_common.h"
diff --git a/test_apps/main/test_relay_chn_notify_multi.c b/test_apps/main/test_relay_chn_notify_multi.c
index 35844bc..bef58b0 100644
--- a/test_apps/main/test_relay_chn_notify_multi.c
+++ b/test_apps/main/test_relay_chn_notify_multi.c
@@ -1,3 +1,9 @@
+/*
+ * SPDX-FileCopyrightText: 2025 Kozmotronik Tech
+ *
+ * SPDX-License-Identifier: MIT
+ */
+
 #include "test_relay_chn_notify_common.h"
 
 // This is a private header, but we need it for direct notification calls and queue length.
diff --git a/test_apps/main/test_relay_chn_notify_single.c b/test_apps/main/test_relay_chn_notify_single.c
index 66e2a92..8d29704 100644
--- a/test_apps/main/test_relay_chn_notify_single.c
+++ b/test_apps/main/test_relay_chn_notify_single.c
@@ -1,3 +1,9 @@
+/*
+ * SPDX-FileCopyrightText: 2025 Kozmotronik Tech
+ *
+ * SPDX-License-Identifier: MIT
+ */
+
 #include "test_relay_chn_notify_common.h"
 
 // This is a private header, but we need it for direct notification calls and queue length.
diff --git a/test_apps/main/test_relay_chn_tilt_multi.c b/test_apps/main/test_relay_chn_tilt_multi.c
index b5d9913..07e102e 100644
--- a/test_apps/main/test_relay_chn_tilt_multi.c
+++ b/test_apps/main/test_relay_chn_tilt_multi.c
@@ -1,3 +1,9 @@
+/*
+ * SPDX-FileCopyrightText: 2025 Kozmotronik Tech
+ *
+ * SPDX-License-Identifier: MIT
+ */
+
 #include "test_common.h"
 
 
diff --git a/test_apps/main/test_relay_chn_tilt_single.c b/test_apps/main/test_relay_chn_tilt_single.c
index 185e535..7137822 100644
--- a/test_apps/main/test_relay_chn_tilt_single.c
+++ b/test_apps/main/test_relay_chn_tilt_single.c
@@ -1,3 +1,9 @@
+/*
+ * SPDX-FileCopyrightText: 2025 Kozmotronik Tech
+ *
+ * SPDX-License-Identifier: MIT
+ */
+
 #include "test_common.h"