diff --git a/extmod/modtrezorcrypto/rand.c b/extmod/modtrezorcrypto/rand.c
index 665f311e..0f100e40 100644
--- a/extmod/modtrezorcrypto/rand.c
+++ b/extmod/modtrezorcrypto/rand.c
@@ -1,3 +1,10 @@
+/*
+ * Copyright (c) Pavol Rusnak, SatoshiLabs
+ *
+ * Licensed under TREZOR License
+ * see LICENSE file for details
+ */
+
 #include <string.h>
 #include "rand.h"
 
diff --git a/extmod/modtrezorcrypto/rand.h b/extmod/modtrezorcrypto/rand.h
index 84253b9c..d2624cec 100644
--- a/extmod/modtrezorcrypto/rand.h
+++ b/extmod/modtrezorcrypto/rand.h
@@ -1,3 +1,10 @@
+/*
+ * Copyright (c) Pavol Rusnak, SatoshiLabs
+ *
+ * Licensed under TREZOR License
+ * see LICENSE file for details
+ */
+
 #ifndef __RAND_H__
 #define __RAND_H__
 
diff --git a/extmod/modtrezorcrypto/ssss.c b/extmod/modtrezorcrypto/ssss.c
index 66658214..51889317 100644
--- a/extmod/modtrezorcrypto/ssss.c
+++ b/extmod/modtrezorcrypto/ssss.c
@@ -1,3 +1,10 @@
+/*
+ * Copyright (c) Pavol Rusnak, SatoshiLabs
+ *
+ * Licensed under TREZOR License
+ * see LICENSE file for details
+ */
+
 #include "ssss.h"
 
 bool ssss_split(const bignum256 *secret, int m, int n, bignum256 *shares)
diff --git a/extmod/modtrezorcrypto/ssss.h b/extmod/modtrezorcrypto/ssss.h
index 6d8e50d6..bb463106 100644
--- a/extmod/modtrezorcrypto/ssss.h
+++ b/extmod/modtrezorcrypto/ssss.h
@@ -1,3 +1,10 @@
+/*
+ * Copyright (c) Pavol Rusnak, SatoshiLabs
+ *
+ * Licensed under TREZOR License
+ * see LICENSE file for details
+ */
+
 #ifndef __SSSS_H__
 #define __SSSS_H__
 
diff --git a/extmod/modtrezormsg/modtrezormsg-stmhal.h b/extmod/modtrezormsg/modtrezormsg-stmhal.h
index db2f8499..9fd21a87 100644
--- a/extmod/modtrezormsg/modtrezormsg-stmhal.h
+++ b/extmod/modtrezormsg/modtrezormsg-stmhal.h
@@ -1,3 +1,10 @@
+/*
+ * Copyright (c) Pavol Rusnak, SatoshiLabs
+ *
+ * Licensed under TREZOR License
+ * see LICENSE file for details
+ */
+
 extern struct _USBD_HandleTypeDef hUSBDDevice;
 extern uint8_t USBD_HID_SendReport(struct _USBD_HandleTypeDef *pdev, uint8_t *report, uint16_t len);
 extern int USBD_HID_Rx(uint8_t *buf, uint32_t len, uint32_t timeout);
diff --git a/extmod/modtrezormsg/modtrezormsg-unix.h b/extmod/modtrezormsg/modtrezormsg-unix.h
index 38cc34d7..fdb1adea 100644
--- a/extmod/modtrezormsg/modtrezormsg-unix.h
+++ b/extmod/modtrezormsg/modtrezormsg-unix.h
@@ -1,3 +1,10 @@
+/*
+ * Copyright (c) Pavol Rusnak, SatoshiLabs
+ *
+ * Licensed under TREZOR License
+ * see LICENSE file for details
+ */
+
 #include <arpa/inet.h>
 #include <sys/socket.h>
 #include <fcntl.h>