diff --git a/targets/TARGET_STM/TARGET_STM32L4/TARGET_STM32L432xC/system_clock.c b/targets/TARGET_STM/TARGET_STM32L4/TARGET_STM32L432xC/system_clock.c
index 1be745bd94..0c72d2ab45 100644
--- a/targets/TARGET_STM/TARGET_STM32L4/TARGET_STM32L432xC/system_clock.c
+++ b/targets/TARGET_STM/TARGET_STM32L4/TARGET_STM32L432xC/system_clock.c
@@ -1,29 +1,21 @@
+/* mbed Microcontroller Library
+ * Copyright (c) 2016-2020 STMicroelectronics
+ * SPDX-License-Identifier: Apache-2.0
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
 /**
-  ******************************************************************************
-  * @file    system_stm32l4xx.c
-  * @author  MCD Application Team
-  * @version V1.3.1
-  * @date    21-April-2017
-  * @brief   CMSIS Cortex-M4 Device Peripheral Access Layer System Source File
-  *
-  *   This file provides two functions and one global variable to be called from
-  *   user application:
-  *      - SystemInit(): This function is called at startup just after reset and
-  *                      before branch to main program. This call is made inside
-  *                      the "startup_stm32l4xx.s" file.
-  *
-  *      - SystemCoreClock variable: Contains the core clock (HCLK), it can be used
-  *                                  by the user application to setup the SysTick
-  *                                  timer or configure other parameters.
-  *
-  *      - SystemCoreClockUpdate(): Updates the variable SystemCoreClock and must
-  *                                 be called whenever the core clock is changed
-  *                                 during program execution.
-  *
-  *   After each device reset the MSI (4 MHz) is used as system clock source.
-  *   Then SystemInit() function is called, in "startup_stm32l4xx.s" file, to
-  *   configure the system clock before to branch to main program.
-  *
   *   This file configures the system clock as follows:
   *=============================================================================
   * System clock source                | 1- PLL_HSE_EXTC        | 3- PLL_HSI
diff --git a/targets/TARGET_STM/TARGET_STM32L4/TARGET_STM32L433xC/system_clock.c b/targets/TARGET_STM/TARGET_STM32L4/TARGET_STM32L433xC/system_clock.c
index 1be745bd94..0c72d2ab45 100644
--- a/targets/TARGET_STM/TARGET_STM32L4/TARGET_STM32L433xC/system_clock.c
+++ b/targets/TARGET_STM/TARGET_STM32L4/TARGET_STM32L433xC/system_clock.c
@@ -1,29 +1,21 @@
+/* mbed Microcontroller Library
+ * Copyright (c) 2016-2020 STMicroelectronics
+ * SPDX-License-Identifier: Apache-2.0
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
 /**
-  ******************************************************************************
-  * @file    system_stm32l4xx.c
-  * @author  MCD Application Team
-  * @version V1.3.1
-  * @date    21-April-2017
-  * @brief   CMSIS Cortex-M4 Device Peripheral Access Layer System Source File
-  *
-  *   This file provides two functions and one global variable to be called from
-  *   user application:
-  *      - SystemInit(): This function is called at startup just after reset and
-  *                      before branch to main program. This call is made inside
-  *                      the "startup_stm32l4xx.s" file.
-  *
-  *      - SystemCoreClock variable: Contains the core clock (HCLK), it can be used
-  *                                  by the user application to setup the SysTick
-  *                                  timer or configure other parameters.
-  *
-  *      - SystemCoreClockUpdate(): Updates the variable SystemCoreClock and must
-  *                                 be called whenever the core clock is changed
-  *                                 during program execution.
-  *
-  *   After each device reset the MSI (4 MHz) is used as system clock source.
-  *   Then SystemInit() function is called, in "startup_stm32l4xx.s" file, to
-  *   configure the system clock before to branch to main program.
-  *
   *   This file configures the system clock as follows:
   *=============================================================================
   * System clock source                | 1- PLL_HSE_EXTC        | 3- PLL_HSI
diff --git a/targets/TARGET_STM/TARGET_STM32L4/TARGET_STM32L443xC/system_clock.c b/targets/TARGET_STM/TARGET_STM32L4/TARGET_STM32L443xC/system_clock.c
index 370d838335..567781b7b0 100644
--- a/targets/TARGET_STM/TARGET_STM32L4/TARGET_STM32L443xC/system_clock.c
+++ b/targets/TARGET_STM/TARGET_STM32L4/TARGET_STM32L443xC/system_clock.c
@@ -1,29 +1,21 @@
+/* mbed Microcontroller Library
+ * Copyright (c) 2016-2020 STMicroelectronics
+ * SPDX-License-Identifier: Apache-2.0
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
 /**
-  ******************************************************************************
-  * @file    system_stm32l4xx.c
-  * @author  MCD Application Team
-  * @version V1.3.1
-  * @date    21-April-2017
-  * @brief   CMSIS Cortex-M4 Device Peripheral Access Layer System Source File
-  *
-  *   This file provides two functions and one global variable to be called from
-  *   user application:
-  *      - SystemInit(): This function is called at startup just after reset and
-  *                      before branch to main program. This call is made inside
-  *                      the "startup_stm32l4xx.s" file.
-  *
-  *      - SystemCoreClock variable: Contains the core clock (HCLK), it can be used
-  *                                  by the user application to setup the SysTick
-  *                                  timer or configure other parameters.
-  *
-  *      - SystemCoreClockUpdate(): Updates the variable SystemCoreClock and must
-  *                                 be called whenever the core clock is changed
-  *                                 during program execution.
-  *
-  *   After each device reset the MSI (4 MHz) is used as system clock source.
-  *   Then SystemInit() function is called, in "startup_stm32l4xx.s" file, to
-  *   configure the system clock before to branch to main program.
-  *
   *   This file configures the system clock as follows:
   *=============================================================================
   * System clock source                | 1- PLL_HSE_EXTC        | 3- PLL_HSI
diff --git a/targets/TARGET_STM/TARGET_STM32L4/TARGET_STM32L452xE/system_clock.c b/targets/TARGET_STM/TARGET_STM32L4/TARGET_STM32L452xE/system_clock.c
index 6eb9dfb5da..68368bc21a 100644
--- a/targets/TARGET_STM/TARGET_STM32L4/TARGET_STM32L452xE/system_clock.c
+++ b/targets/TARGET_STM/TARGET_STM32L4/TARGET_STM32L452xE/system_clock.c
@@ -1,29 +1,21 @@
+/* mbed Microcontroller Library
+ * Copyright (c) 2016-2020 STMicroelectronics
+ * SPDX-License-Identifier: Apache-2.0
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
 /**
-  ******************************************************************************
-  * @file    system_stm32l4xx.c
-  * @author  MCD Application Team
-  * @version V1.3.1
-  * @date    21-April-2017
-  * @brief   CMSIS Cortex-M4 Device Peripheral Access Layer System Source File
-  *
-  *   This file provides two functions and one global variable to be called from
-  *   user application:
-  *      - SystemInit(): This function is called at startup just after reset and
-  *                      before branch to main program. This call is made inside
-  *                      the "startup_stm32l4xx.s" file.
-  *
-  *      - SystemCoreClock variable: Contains the core clock (HCLK), it can be used
-  *                                  by the user application to setup the SysTick
-  *                                  timer or configure other parameters.
-  *
-  *      - SystemCoreClockUpdate(): Updates the variable SystemCoreClock and must
-  *                                 be called whenever the core clock is changed
-  *                                 during program execution.
-  *
-  *   After each device reset the MSI (4 MHz) is used as system clock source.
-  *   Then SystemInit() function is called, in "startup_stm32l4xx.s" file, to
-  *   configure the system clock before to branch to main program.
-  *
   *   This file configures the system clock as follows:
   *=============================================================================
   * System clock source          s      | 1- PLL_HSE_EXTC        | 3- PLL_HSI
diff --git a/targets/TARGET_STM/TARGET_STM32L4/TARGET_STM32L471xG/system_clock.c b/targets/TARGET_STM/TARGET_STM32L4/TARGET_STM32L471xG/system_clock.c
index 035cf15207..a194e6eeb4 100644
--- a/targets/TARGET_STM/TARGET_STM32L4/TARGET_STM32L471xG/system_clock.c
+++ b/targets/TARGET_STM/TARGET_STM32L4/TARGET_STM32L471xG/system_clock.c
@@ -1,19 +1,19 @@
 /* mbed Microcontroller Library
-* Copyright (c) 2006-2017 ARM Limited
-* SPDX-License-Identifier: Apache-2.0
-*
-* Licensed under the Apache License, Version 2.0 (the "License");
-* you may not use this file except in compliance with the License.
-* You may obtain a copy of the License at
-*
-*     http://www.apache.org/licenses/LICENSE-2.0
-*
-* Unless required by applicable law or agreed to in writing, software
-* distributed under the License is distributed on an "AS IS" BASIS,
-* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
-* See the License for the specific language governing permissions and
-* limitations under the License.
-*/
+ * Copyright (c) 2016-2020 STMicroelectronics
+ * SPDX-License-Identifier: Apache-2.0
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
 
 /**
   * This file configures the system clock as follows:
diff --git a/targets/TARGET_STM/TARGET_STM32L4/TARGET_STM32L475xG/system_clock.c b/targets/TARGET_STM/TARGET_STM32L4/TARGET_STM32L475xG/system_clock.c
index 035cf15207..a194e6eeb4 100644
--- a/targets/TARGET_STM/TARGET_STM32L4/TARGET_STM32L475xG/system_clock.c
+++ b/targets/TARGET_STM/TARGET_STM32L4/TARGET_STM32L475xG/system_clock.c
@@ -1,19 +1,19 @@
 /* mbed Microcontroller Library
-* Copyright (c) 2006-2017 ARM Limited
-* SPDX-License-Identifier: Apache-2.0
-*
-* Licensed under the Apache License, Version 2.0 (the "License");
-* you may not use this file except in compliance with the License.
-* You may obtain a copy of the License at
-*
-*     http://www.apache.org/licenses/LICENSE-2.0
-*
-* Unless required by applicable law or agreed to in writing, software
-* distributed under the License is distributed on an "AS IS" BASIS,
-* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
-* See the License for the specific language governing permissions and
-* limitations under the License.
-*/
+ * Copyright (c) 2016-2020 STMicroelectronics
+ * SPDX-License-Identifier: Apache-2.0
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
 
 /**
   * This file configures the system clock as follows:
diff --git a/targets/TARGET_STM/TARGET_STM32L4/TARGET_STM32L476xG/system_clock.c b/targets/TARGET_STM/TARGET_STM32L4/TARGET_STM32L476xG/system_clock.c
index 035cf15207..a194e6eeb4 100644
--- a/targets/TARGET_STM/TARGET_STM32L4/TARGET_STM32L476xG/system_clock.c
+++ b/targets/TARGET_STM/TARGET_STM32L4/TARGET_STM32L476xG/system_clock.c
@@ -1,19 +1,19 @@
 /* mbed Microcontroller Library
-* Copyright (c) 2006-2017 ARM Limited
-* SPDX-License-Identifier: Apache-2.0
-*
-* Licensed under the Apache License, Version 2.0 (the "License");
-* you may not use this file except in compliance with the License.
-* You may obtain a copy of the License at
-*
-*     http://www.apache.org/licenses/LICENSE-2.0
-*
-* Unless required by applicable law or agreed to in writing, software
-* distributed under the License is distributed on an "AS IS" BASIS,
-* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
-* See the License for the specific language governing permissions and
-* limitations under the License.
-*/
+ * Copyright (c) 2016-2020 STMicroelectronics
+ * SPDX-License-Identifier: Apache-2.0
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
 
 /**
   * This file configures the system clock as follows:
diff --git a/targets/TARGET_STM/TARGET_STM32L4/TARGET_STM32L486xG/TARGET_ADV_WISE_1570/system_clock.c b/targets/TARGET_STM/TARGET_STM32L4/TARGET_STM32L486xG/TARGET_ADV_WISE_1570/system_clock.c
index 6e9d7cb5cc..09ef9363d5 100644
--- a/targets/TARGET_STM/TARGET_STM32L4/TARGET_STM32L486xG/TARGET_ADV_WISE_1570/system_clock.c
+++ b/targets/TARGET_STM/TARGET_STM32L4/TARGET_STM32L486xG/TARGET_ADV_WISE_1570/system_clock.c
@@ -1,19 +1,19 @@
 /* mbed Microcontroller Library
-* Copyright (c) 2006-2017 ARM Limited
-* SPDX-License-Identifier: Apache-2.0
-*
-* Licensed under the Apache License, Version 2.0 (the "License");
-* you may not use this file except in compliance with the License.
-* You may obtain a copy of the License at
-*
-*     http://www.apache.org/licenses/LICENSE-2.0
-*
-* Unless required by applicable law or agreed to in writing, software
-* distributed under the License is distributed on an "AS IS" BASIS,
-* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
-* See the License for the specific language governing permissions and
-* limitations under the License.
-*/
+ * Copyright (c) 2016-2020 STMicroelectronics
+ * SPDX-License-Identifier: Apache-2.0
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
 
 /**
   * This file configures the system clock as follows:
diff --git a/targets/TARGET_STM/TARGET_STM32L4/TARGET_STM32L486xG/TARGET_NUCLEO_L486RG/system_clock.c b/targets/TARGET_STM/TARGET_STM32L4/TARGET_STM32L486xG/TARGET_NUCLEO_L486RG/system_clock.c
index 035cf15207..a194e6eeb4 100644
--- a/targets/TARGET_STM/TARGET_STM32L4/TARGET_STM32L486xG/TARGET_NUCLEO_L486RG/system_clock.c
+++ b/targets/TARGET_STM/TARGET_STM32L4/TARGET_STM32L486xG/TARGET_NUCLEO_L486RG/system_clock.c
@@ -1,19 +1,19 @@
 /* mbed Microcontroller Library
-* Copyright (c) 2006-2017 ARM Limited
-* SPDX-License-Identifier: Apache-2.0
-*
-* Licensed under the Apache License, Version 2.0 (the "License");
-* you may not use this file except in compliance with the License.
-* You may obtain a copy of the License at
-*
-*     http://www.apache.org/licenses/LICENSE-2.0
-*
-* Unless required by applicable law or agreed to in writing, software
-* distributed under the License is distributed on an "AS IS" BASIS,
-* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
-* See the License for the specific language governing permissions and
-* limitations under the License.
-*/
+ * Copyright (c) 2016-2020 STMicroelectronics
+ * SPDX-License-Identifier: Apache-2.0
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
 
 /**
   * This file configures the system clock as follows:
diff --git a/targets/TARGET_STM/TARGET_STM32L4/TARGET_STM32L496xG/system_clock.c b/targets/TARGET_STM/TARGET_STM32L4/TARGET_STM32L496xG/system_clock.c
index 8a2da99f04..6b998327ec 100644
--- a/targets/TARGET_STM/TARGET_STM32L4/TARGET_STM32L496xG/system_clock.c
+++ b/targets/TARGET_STM/TARGET_STM32L4/TARGET_STM32L496xG/system_clock.c
@@ -1,19 +1,19 @@
 /* mbed Microcontroller Library
-* Copyright (c) 2006-2017 ARM Limited
-* SPDX-License-Identifier: Apache-2.0
-*
-* Licensed under the Apache License, Version 2.0 (the "License");
-* you may not use this file except in compliance with the License.
-* You may obtain a copy of the License at
-*
-*     http://www.apache.org/licenses/LICENSE-2.0
-*
-* Unless required by applicable law or agreed to in writing, software
-* distributed under the License is distributed on an "AS IS" BASIS,
-* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
-* See the License for the specific language governing permissions and
-* limitations under the License.
-*/
+ * Copyright (c) 2016-2020 STMicroelectronics
+ * SPDX-License-Identifier: Apache-2.0
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
 
 /**
   * This file configures the system clock as follows:
diff --git a/targets/TARGET_STM/TARGET_STM32L4/TARGET_STM32L4R5xI/system_clock.c b/targets/TARGET_STM/TARGET_STM32L4/TARGET_STM32L4R5xI/system_clock.c
index 50067f2db6..95b9ba8c83 100644
--- a/targets/TARGET_STM/TARGET_STM32L4/TARGET_STM32L4R5xI/system_clock.c
+++ b/targets/TARGET_STM/TARGET_STM32L4/TARGET_STM32L4R5xI/system_clock.c
@@ -1,20 +1,19 @@
 /* mbed Microcontroller Library
-* Copyright (c) 2006-2019 ARM Limited
-* Copyright (c) 2006-2019 STMicroelectronics
-* SPDX-License-Identifier: Apache-2.0
-*
-* Licensed under the Apache License, Version 2.0 (the "License");
-* you may not use this file except in compliance with the License.
-* You may obtain a copy of the License at
-*
-*     http://www.apache.org/licenses/LICENSE-2.0
-*
-* Unless required by applicable law or agreed to in writing, software
-* distributed under the License is distributed on an "AS IS" BASIS,
-* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
-* See the License for the specific language governing permissions and
-* limitations under the License.
-*/
+ * Copyright (c) 2016-2020 STMicroelectronics
+ * SPDX-License-Identifier: Apache-2.0
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
 
 /**
   * This file configures the system clock as follows:
diff --git a/targets/TARGET_STM/TARGET_STM32L4/TARGET_STM32L4R9xI/system_clock.c b/targets/TARGET_STM/TARGET_STM32L4/TARGET_STM32L4R9xI/system_clock.c
index 1e5d827243..d7928d5d6e 100644
--- a/targets/TARGET_STM/TARGET_STM32L4/TARGET_STM32L4R9xI/system_clock.c
+++ b/targets/TARGET_STM/TARGET_STM32L4/TARGET_STM32L4R9xI/system_clock.c
@@ -1,20 +1,19 @@
 /* mbed Microcontroller Library
-* Copyright (c) 2006-2019 ARM Limited
-* Copyright (c) 2006-2019 STMicroelectronics
-* SPDX-License-Identifier: Apache-2.0
-*
-* Licensed under the Apache License, Version 2.0 (the "License");
-* you may not use this file except in compliance with the License.
-* You may obtain a copy of the License at
-*
-*     http://www.apache.org/licenses/LICENSE-2.0
-*
-* Unless required by applicable law or agreed to in writing, software
-* distributed under the License is distributed on an "AS IS" BASIS,
-* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
-* See the License for the specific language governing permissions and
-* limitations under the License.
-*/
+ * Copyright (c) 2016-2020 STMicroelectronics
+ * SPDX-License-Identifier: Apache-2.0
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
 
 /**
   * This file configures the system clock as follows:
diff --git a/targets/TARGET_STM/TARGET_STM32L4/TARGET_STM32L4S5xI/system_clock.c b/targets/TARGET_STM/TARGET_STM32L4/TARGET_STM32L4S5xI/system_clock.c
index 0e4a33b47a..d9d0c93074 100644
--- a/targets/TARGET_STM/TARGET_STM32L4/TARGET_STM32L4S5xI/system_clock.c
+++ b/targets/TARGET_STM/TARGET_STM32L4/TARGET_STM32L4S5xI/system_clock.c
@@ -1,17 +1,18 @@
 /* mbed Microcontroller Library
- * SPDX-License-Identifier: BSD-3-Clause
- ******************************************************************************
+ * Copyright (c) 2016-2020 STMicroelectronics
+ * SPDX-License-Identifier: Apache-2.0
  *
- * Copyright (c) 2016-2020 STMicroelectronics.
- * All rights reserved.
- * This software component is licensed by ST under BSD 3-Clause license,
- * the "License"; You may not use this file except in compliance with the
- * License. You may obtain a copy of the License at:
- *                        opensource.org/licenses/BSD-3-Clause
- *
- ******************************************************************************
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
  *
+ *     http://www.apache.org/licenses/LICENSE-2.0
  *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
  */
 
 /**
diff --git a/targets/TARGET_STM/TARGET_STM32L4/analogin_device.c b/targets/TARGET_STM/TARGET_STM32L4/analogin_device.c
index 18d04157e3..60a9d8082c 100644
--- a/targets/TARGET_STM/TARGET_STM32L4/analogin_device.c
+++ b/targets/TARGET_STM/TARGET_STM32L4/analogin_device.c
@@ -1,30 +1,20 @@
 /* mbed Microcontroller Library
- * Copyright (c) 2016, STMicroelectronics
- * All rights reserved.
+ * Copyright (c) 2016-2020 STMicroelectronics
+ * SPDX-License-Identifier: Apache-2.0
  *
- * Redistribution and use in source and binary forms, with or without
- * modification, are permitted provided that the following conditions are met:
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
  *
- * 1. Redistributions of source code must retain the above copyright notice,
- *    this list of conditions and the following disclaimer.
- * 2. Redistributions in binary form must reproduce the above copyright notice,
- *    this list of conditions and the following disclaimer in the documentation
- *    and/or other materials provided with the distribution.
- * 3. Neither the name of STMicroelectronics nor the names of its contributors
- *    may be used to endorse or promote products derived from this software
- *    without specific prior written permission.
+ *     http://www.apache.org/licenses/LICENSE-2.0
  *
- * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
- * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
- * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
- * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
- * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
- * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
- * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
- * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
- * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
- * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
  */
+
 #include "mbed_assert.h"
 #include "analogin_api.h"
 
diff --git a/targets/TARGET_STM/TARGET_STM32L4/analogout_device.c b/targets/TARGET_STM/TARGET_STM32L4/analogout_device.c
index 2dfcb6522a..ab3fe57cfb 100644
--- a/targets/TARGET_STM/TARGET_STM32L4/analogout_device.c
+++ b/targets/TARGET_STM/TARGET_STM32L4/analogout_device.c
@@ -1,30 +1,20 @@
 /* mbed Microcontroller Library
- * Copyright (c) 2015, STMicroelectronics
- * All rights reserved.
+ * Copyright (c) 2016-2020 STMicroelectronics
+ * SPDX-License-Identifier: Apache-2.0
  *
- * Redistribution and use in source and binary forms, with or without
- * modification, are permitted provided that the following conditions are met:
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
  *
- * 1. Redistributions of source code must retain the above copyright notice,
- *    this list of conditions and the following disclaimer.
- * 2. Redistributions in binary form must reproduce the above copyright notice,
- *    this list of conditions and the following disclaimer in the documentation
- *    and/or other materials provided with the distribution.
- * 3. Neither the name of STMicroelectronics nor the names of its contributors
- *    may be used to endorse or promote products derived from this software
- *    without specific prior written permission.
+ *     http://www.apache.org/licenses/LICENSE-2.0
  *
- * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
- * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
- * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
- * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
- * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
- * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
- * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
- * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
- * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
- * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
  */
+
 #include "mbed_assert.h"
 #include "analogout_api.h"
 
diff --git a/targets/TARGET_STM/TARGET_STM32L4/can_device.h b/targets/TARGET_STM/TARGET_STM32L4/can_device.h
index 5da17f334f..3a21300705 100644
--- a/targets/TARGET_STM/TARGET_STM32L4/can_device.h
+++ b/targets/TARGET_STM/TARGET_STM32L4/can_device.h
@@ -1,5 +1,5 @@
 /* mbed Microcontroller Library
- * Copyright (c) 2006-2017 ARM Limited
+ * Copyright (c) 2016-2020 STMicroelectronics
  * SPDX-License-Identifier: Apache-2.0
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
@@ -14,6 +14,7 @@
  * See the License for the specific language governing permissions and
  * limitations under the License.
  */
+
 #ifndef MBED_CAN_DEVICE_H
 #define MBED_CAN_DEVICE_H
 
diff --git a/targets/TARGET_STM/TARGET_STM32L4/cmsis.h b/targets/TARGET_STM/TARGET_STM32L4/cmsis.h
index bfcad1eb2f..8cb48e594d 100644
--- a/targets/TARGET_STM/TARGET_STM32L4/cmsis.h
+++ b/targets/TARGET_STM/TARGET_STM32L4/cmsis.h
@@ -1,5 +1,5 @@
 /* mbed Microcontroller Library
- * Copyright (c) 2019 ARM Limited
+ * Copyright (c) 2016-2020 STMicroelectronics
  * SPDX-License-Identifier: Apache-2.0
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
diff --git a/targets/TARGET_STM/TARGET_STM32L4/flash_api.c b/targets/TARGET_STM/TARGET_STM32L4/flash_api.c
index 826e15e696..9457d28e49 100644
--- a/targets/TARGET_STM/TARGET_STM32L4/flash_api.c
+++ b/targets/TARGET_STM/TARGET_STM32L4/flash_api.c
@@ -1,5 +1,4 @@
 /* mbed Microcontroller Library
- * Copyright (c) 2017 ARM Limited
  * Copyright (c) 2017 STMicroelectronics
  * SPDX-License-Identifier: Apache-2.0
  *
diff --git a/targets/TARGET_STM/TARGET_STM32L4/gpio_irq_device.c b/targets/TARGET_STM/TARGET_STM32L4/gpio_irq_device.c
index 9f63aff054..29f2f1f310 100644
--- a/targets/TARGET_STM/TARGET_STM32L4/gpio_irq_device.c
+++ b/targets/TARGET_STM/TARGET_STM32L4/gpio_irq_device.c
@@ -1,32 +1,20 @@
 /* mbed Microcontroller Library
- *******************************************************************************
- * Copyright (c) 2017, STMicroelectronics
- * All rights reserved.
+ * Copyright (c) 2016-2020 STMicroelectronics
+ * SPDX-License-Identifier: Apache-2.0
  *
- * Redistribution and use in source and binary forms, with or without
- * modification, are permitted provided that the following conditions are met:
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
  *
- * 1. Redistributions of source code must retain the above copyright notice,
- *    this list of conditions and the following disclaimer.
- * 2. Redistributions in binary form must reproduce the above copyright notice,
- *    this list of conditions and the following disclaimer in the documentation
- *    and/or other materials provided with the distribution.
- * 3. Neither the name of STMicroelectronics nor the names of its contributors
- *    may be used to endorse or promote products derived from this software
- *    without specific prior written permission.
+ *     http://www.apache.org/licenses/LICENSE-2.0
  *
- * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
- * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
- * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
- * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
- * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
- * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
- * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
- * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
- * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
- * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
- *******************************************************************************
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
  */
+
 #include "cmsis.h"
 #include "gpio_irq_device.h"
 
diff --git a/targets/TARGET_STM/TARGET_STM32L4/gpio_irq_device.h b/targets/TARGET_STM/TARGET_STM32L4/gpio_irq_device.h
index 339077445f..5f373404c6 100644
--- a/targets/TARGET_STM/TARGET_STM32L4/gpio_irq_device.h
+++ b/targets/TARGET_STM/TARGET_STM32L4/gpio_irq_device.h
@@ -1,32 +1,20 @@
 /* mbed Microcontroller Library
- *******************************************************************************
- * Copyright (c) 2017, STMicroelectronics
- * All rights reserved.
+ * Copyright (c) 2016-2020 STMicroelectronics
+ * SPDX-License-Identifier: Apache-2.0
  *
- * Redistribution and use in source and binary forms, with or without
- * modification, are permitted provided that the following conditions are met:
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
  *
- * 1. Redistributions of source code must retain the above copyright notice,
- *    this list of conditions and the following disclaimer.
- * 2. Redistributions in binary form must reproduce the above copyright notice,
- *    this list of conditions and the following disclaimer in the documentation
- *    and/or other materials provided with the distribution.
- * 3. Neither the name of STMicroelectronics nor the names of its contributors
- *    may be used to endorse or promote products derived from this software
- *    without specific prior written permission.
+ *     http://www.apache.org/licenses/LICENSE-2.0
  *
- * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
- * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
- * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
- * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
- * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
- * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
- * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
- * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
- * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
- * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
- *******************************************************************************
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
  */
+
 #ifndef MBED_GPIO_IRQ_DEVICE_H
 #define MBED_GPIO_IRQ_DEVICE_H
 
diff --git a/targets/TARGET_STM/TARGET_STM32L4/i2c_device.h b/targets/TARGET_STM/TARGET_STM32L4/i2c_device.h
index 7ad782baa7..6368b4c53b 100644
--- a/targets/TARGET_STM/TARGET_STM32L4/i2c_device.h
+++ b/targets/TARGET_STM/TARGET_STM32L4/i2c_device.h
@@ -1,32 +1,20 @@
 /* mbed Microcontroller Library
- *******************************************************************************
- * Copyright (c) 2015, STMicroelectronics
- * All rights reserved.
+ * Copyright (c) 2016-2020 STMicroelectronics
+ * SPDX-License-Identifier: Apache-2.0
  *
- * Redistribution and use in source and binary forms, with or without
- * modification, are permitted provided that the following conditions are met:
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
  *
- * 1. Redistributions of source code must retain the above copyright notice,
- *    this list of conditions and the following disclaimer.
- * 2. Redistributions in binary form must reproduce the above copyright notice,
- *    this list of conditions and the following disclaimer in the documentation
- *    and/or other materials provided with the distribution.
- * 3. Neither the name of STMicroelectronics nor the names of its contributors
- *    may be used to endorse or promote products derived from this software
- *    without specific prior written permission.
+ *     http://www.apache.org/licenses/LICENSE-2.0
  *
- * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
- * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
- * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
- * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
- * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
- * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
- * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
- * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
- * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
- * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
- *******************************************************************************
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
  */
+
 #ifndef MBED_I2C_DEVICE_H
 #define MBED_I2C_DEVICE_H
 
diff --git a/targets/TARGET_STM/TARGET_STM32L4/pin_device.h b/targets/TARGET_STM/TARGET_STM32L4/pin_device.h
index d612b5def2..095eeaae01 100644
--- a/targets/TARGET_STM/TARGET_STM32L4/pin_device.h
+++ b/targets/TARGET_STM/TARGET_STM32L4/pin_device.h
@@ -1,32 +1,20 @@
 /* mbed Microcontroller Library
- *******************************************************************************
- * Copyright (c) 2016, STMicroelectronics
- * All rights reserved.
+ * Copyright (c) 2016-2020 STMicroelectronics
+ * SPDX-License-Identifier: Apache-2.0
  *
- * Redistribution and use in source and binary forms, with or without
- * modification, are permitted provided that the following conditions are met:
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
  *
- * 1. Redistributions of source code must retain the above copyright notice,
- *    this list of conditions and the following disclaimer.
- * 2. Redistributions in binary form must reproduce the above copyright notice,
- *    this list of conditions and the following disclaimer in the documentation
- *    and/or other materials provided with the distribution.
- * 3. Neither the name of STMicroelectronics nor the names of its contributors
- *    may be used to endorse or promote products derived from this software
- *    without specific prior written permission.
+ *     http://www.apache.org/licenses/LICENSE-2.0
  *
- * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
- * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
- * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
- * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
- * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
- * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
- * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
- * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
- * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
- * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
- *******************************************************************************
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
  */
+
 #ifndef MBED_PIN_DEVICE_H
 #define MBED_PIN_DEVICE_H
 
diff --git a/targets/TARGET_STM/TARGET_STM32L4/pwmout_device.c b/targets/TARGET_STM/TARGET_STM32L4/pwmout_device.c
index d82c3ededb..40b424b3a8 100644
--- a/targets/TARGET_STM/TARGET_STM32L4/pwmout_device.c
+++ b/targets/TARGET_STM/TARGET_STM32L4/pwmout_device.c
@@ -1,32 +1,20 @@
 /* mbed Microcontroller Library
- *******************************************************************************
- * Copyright (c) 2017, STMicroelectronics
- * All rights reserved.
+ * Copyright (c) 2016-2020 STMicroelectronics
+ * SPDX-License-Identifier: Apache-2.0
  *
- * Redistribution and use in source and binary forms, with or without
- * modification, are permitted provided that the following conditions are met:
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
  *
- * 1. Redistributions of source code must retain the above copyright notice,
- *    this list of conditions and the following disclaimer.
- * 2. Redistributions in binary form must reproduce the above copyright notice,
- *    this list of conditions and the following disclaimer in the documentation
- *    and/or other materials provided with the distribution.
- * 3. Neither the name of STMicroelectronics nor the names of its contributors
- *    may be used to endorse or promote products derived from this software
- *    without specific prior written permission.
+ *     http://www.apache.org/licenses/LICENSE-2.0
  *
- * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
- * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
- * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
- * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
- * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
- * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
- * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
- * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
- * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
- * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
- *******************************************************************************
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
  */
+
 #include "cmsis.h"
 #include "pwmout_api.h"
 #include "pwmout_device.h"
diff --git a/targets/TARGET_STM/TARGET_STM32L4/pwmout_device.h b/targets/TARGET_STM/TARGET_STM32L4/pwmout_device.h
index bc6f761f18..987a39d475 100644
--- a/targets/TARGET_STM/TARGET_STM32L4/pwmout_device.h
+++ b/targets/TARGET_STM/TARGET_STM32L4/pwmout_device.h
@@ -1,32 +1,20 @@
 /* mbed Microcontroller Library
- *******************************************************************************
- * Copyright (c) 2017, STMicroelectronics
- * All rights reserved.
+ * Copyright (c) 2016-2020 STMicroelectronics
+ * SPDX-License-Identifier: Apache-2.0
  *
- * Redistribution and use in source and binary forms, with or without
- * modification, are permitted provided that the following conditions are met:
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
  *
- * 1. Redistributions of source code must retain the above copyright notice,
- *    this list of conditions and the following disclaimer.
- * 2. Redistributions in binary form must reproduce the above copyright notice,
- *    this list of conditions and the following disclaimer in the documentation
- *    and/or other materials provided with the distribution.
- * 3. Neither the name of STMicroelectronics nor the names of its contributors
- *    may be used to endorse or promote products derived from this software
- *    without specific prior written permission.
+ *     http://www.apache.org/licenses/LICENSE-2.0
  *
- * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
- * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
- * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
- * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
- * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
- * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
- * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
- * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
- * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
- * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
- *******************************************************************************
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
  */
+
 #ifndef MBED_PWMOUT_DEVICE_H
 #define MBED_PWMOUT_DEVICE_H
 
diff --git a/targets/TARGET_STM/TARGET_STM32L4/serial_device.c b/targets/TARGET_STM/TARGET_STM32L4/serial_device.c
index 74637246a8..773984d139 100644
--- a/targets/TARGET_STM/TARGET_STM32L4/serial_device.c
+++ b/targets/TARGET_STM/TARGET_STM32L4/serial_device.c
@@ -1,31 +1,18 @@
 /* mbed Microcontroller Library
- *******************************************************************************
- * Copyright (c) 2017, STMicroelectronics
- * All rights reserved.
+ * Copyright (c) 2016-2020 STMicroelectronics
+ * SPDX-License-Identifier: Apache-2.0
  *
- * Redistribution and use in source and binary forms, with or without
- * modification, are permitted provided that the following conditions are met:
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
  *
- * 1. Redistributions of source code must retain the above copyright notice,
- *    this list of conditions and the following disclaimer.
- * 2. Redistributions in binary form must reproduce the above copyright notice,
- *    this list of conditions and the following disclaimer in the documentation
- *    and/or other materials provided with the distribution.
- * 3. Neither the name of STMicroelectronics nor the names of its contributors
- *    may be used to endorse or promote products derived from this software
- *    without specific prior written permission.
+ *     http://www.apache.org/licenses/LICENSE-2.0
  *
- * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
- * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
- * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
- * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
- * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
- * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
- * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
- * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
- * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
- * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
- *******************************************************************************
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
  */
 
 #if DEVICE_SERIAL
@@ -679,7 +666,7 @@ static void _serial_set_flow_control_direct(serial_t *obj, FlowControl type, con
     }
     if (type == FlowControlRTS) {
         // Enable RTS
-        MBED_ASSERT(pinmap->rx_flow_pin != (UARTName)NC);
+        MBED_ASSERT(pinmap->rx_flow_pin != NC);
         obj_s->pin_rts = pinmap->rx_flow_pin;
         // Enable the pin for RTS function
         pin_function(pinmap->rx_flow_pin, pinmap->rx_flow_function);
@@ -687,7 +674,7 @@ static void _serial_set_flow_control_direct(serial_t *obj, FlowControl type, con
     }
     if (type == FlowControlCTS) {
         // Enable CTS
-        MBED_ASSERT(pinmap->tx_flow_pin != (UARTName)NC);
+        MBED_ASSERT(pinmap->tx_flow_pin != NC);
         obj_s->hw_flow_ctl = UART_HWCONTROL_CTS;
         obj_s->pin_cts = pinmap->tx_flow_pin;
         // Enable the pin for CTS function
@@ -696,8 +683,8 @@ static void _serial_set_flow_control_direct(serial_t *obj, FlowControl type, con
     }
     if (type == FlowControlRTSCTS) {
         // Enable CTS & RTS
-        MBED_ASSERT(pinmap->rx_flow_pin != (UARTName)NC);
-        MBED_ASSERT(pinmap->tx_flow_pin != (UARTName)NC);
+        MBED_ASSERT(pinmap->rx_flow_pin != NC);
+        MBED_ASSERT(pinmap->tx_flow_pin != NC);
         obj_s->hw_flow_ctl = UART_HWCONTROL_RTS_CTS;
         obj_s->pin_rts = pinmap->rx_flow_pin;;
         obj_s->pin_cts = pinmap->tx_flow_pin;;
diff --git a/targets/TARGET_STM/TARGET_STM32L4/spi_api.c b/targets/TARGET_STM/TARGET_STM32L4/spi_api.c
index 562c7ede93..3e275760d0 100644
--- a/targets/TARGET_STM/TARGET_STM32L4/spi_api.c
+++ b/targets/TARGET_STM/TARGET_STM32L4/spi_api.c
@@ -1,32 +1,20 @@
 /* mbed Microcontroller Library
- *******************************************************************************
- * Copyright (c) 2015, STMicroelectronics
- * All rights reserved.
+ * Copyright (c) 2016-2020 STMicroelectronics
+ * SPDX-License-Identifier: Apache-2.0
  *
- * Redistribution and use in source and binary forms, with or without
- * modification, are permitted provided that the following conditions are met:
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
  *
- * 1. Redistributions of source code must retain the above copyright notice,
- *    this list of conditions and the following disclaimer.
- * 2. Redistributions in binary form must reproduce the above copyright notice,
- *    this list of conditions and the following disclaimer in the documentation
- *    and/or other materials provided with the distribution.
- * 3. Neither the name of STMicroelectronics nor the names of its contributors
- *    may be used to endorse or promote products derived from this software
- *    without specific prior written permission.
+ *     http://www.apache.org/licenses/LICENSE-2.0
  *
- * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
- * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
- * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
- * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
- * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
- * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
- * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
- * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
- * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
- * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
- *******************************************************************************
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
  */
+
 #include "mbed_assert.h"
 #include "spi_api.h"
 
diff --git a/targets/TARGET_STM/TARGET_STM32L4/spi_device.h b/targets/TARGET_STM/TARGET_STM32L4/spi_device.h
index ee6b82cc97..ebafaea392 100644
--- a/targets/TARGET_STM/TARGET_STM32L4/spi_device.h
+++ b/targets/TARGET_STM/TARGET_STM32L4/spi_device.h
@@ -1,32 +1,20 @@
 /* mbed Microcontroller Library
- *******************************************************************************
- * Copyright (c) 2017, STMicroelectronics
- * All rights reserved.
+ * Copyright (c) 2016-2020 STMicroelectronics
+ * SPDX-License-Identifier: Apache-2.0
  *
- * Redistribution and use in source and binary forms, with or without
- * modification, are permitted provided that the following conditions are met:
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
  *
- * 1. Redistributions of source code must retain the above copyright notice,
- *    this list of conditions and the following disclaimer.
- * 2. Redistributions in binary form must reproduce the above copyright notice,
- *    this list of conditions and the following disclaimer in the documentation
- *    and/or other materials provided with the distribution.
- * 3. Neither the name of STMicroelectronics nor the names of its contributors
- *    may be used to endorse or promote products derived from this software
- *    without specific prior written permission.
+ *     http://www.apache.org/licenses/LICENSE-2.0
  *
- * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
- * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
- * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
- * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
- * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
- * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
- * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
- * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
- * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
- * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
- *******************************************************************************
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
  */
+
 #ifndef MBED_SPI_DEVICE_H
 #define MBED_SPI_DEVICE_H