diff --git a/boards/avr/at90usb/micropendous3/include/board.h b/boards/avr/at90usb/micropendous3/include/board.h
index 12480c355c..8d85c4d696 100644
--- a/boards/avr/at90usb/micropendous3/include/board.h
+++ b/boards/avr/at90usb/micropendous3/include/board.h
@@ -1,6 +1,8 @@
 /****************************************************************************
  * boards/avr/at90usb/micropendous3/include/board.h
  *
+ * SPDX-License-Identifier: Apache-2.0
+ *
  * Licensed to the Apache Software Foundation (ASF) under one or more
  * contributor license agreements.  See the NOTICE file distributed with
  * this work for additional information regarding copyright ownership.  The
diff --git a/boards/avr/at90usb/micropendous3/scripts/Make.defs b/boards/avr/at90usb/micropendous3/scripts/Make.defs
index 42575dfbdf..d23c3498b6 100644
--- a/boards/avr/at90usb/micropendous3/scripts/Make.defs
+++ b/boards/avr/at90usb/micropendous3/scripts/Make.defs
@@ -1,6 +1,8 @@
 ############################################################################
 # boards/avr/at90usb/micropendous3/scripts/Make.defs
 #
+# SPDX-License-Identifier: Apache-2.0
+#
 # Licensed to the Apache Software Foundation (ASF) under one or more
 # contributor license agreements.  See the NOTICE file distributed with
 # this work for additional information regarding copyright ownership.  The
diff --git a/boards/avr/at90usb/micropendous3/scripts/micropendous3.ld b/boards/avr/at90usb/micropendous3/scripts/micropendous3.ld
index fdf28cc06d..b7e4a6778a 100644
--- a/boards/avr/at90usb/micropendous3/scripts/micropendous3.ld
+++ b/boards/avr/at90usb/micropendous3/scripts/micropendous3.ld
@@ -1,6 +1,8 @@
 /****************************************************************************
  * boards/avr/at90usb/micropendous3/scripts/micropendous3.ld
  *
+ * SPDX-License-Identifier: Apache-2.0
+ *
  * Licensed to the Apache Software Foundation (ASF) under one or more
  * contributor license agreements.  See the NOTICE file distributed with
  * this work for additional information regarding copyright ownership.  The
diff --git a/boards/avr/at90usb/micropendous3/src/Makefile b/boards/avr/at90usb/micropendous3/src/Makefile
index 6604cb6540..752fbf1146 100644
--- a/boards/avr/at90usb/micropendous3/src/Makefile
+++ b/boards/avr/at90usb/micropendous3/src/Makefile
@@ -1,6 +1,8 @@
 ############################################################################
 # boards/avr/at90usb/micropendous3/src/Makefile
 #
+# SPDX-License-Identifier: Apache-2.0
+#
 # Licensed to the Apache Software Foundation (ASF) under one or more
 # contributor license agreements.  See the NOTICE file distributed with
 # this work for additional information regarding copyright ownership.  The
diff --git a/boards/avr/at90usb/micropendous3/src/at90usb_boot.c b/boards/avr/at90usb/micropendous3/src/at90usb_boot.c
index 2ae3c38a03..6ffd0a6f85 100644
--- a/boards/avr/at90usb/micropendous3/src/at90usb_boot.c
+++ b/boards/avr/at90usb/micropendous3/src/at90usb_boot.c
@@ -1,6 +1,8 @@
 /****************************************************************************
  * boards/avr/at90usb/micropendous3/src/at90usb_boot.c
  *
+ * SPDX-License-Identifier: Apache-2.0
+ *
  * Licensed to the Apache Software Foundation (ASF) under one or more
  * contributor license agreements.  See the NOTICE file distributed with
  * this work for additional information regarding copyright ownership.  The
diff --git a/boards/avr/at90usb/micropendous3/src/micropendous3.h b/boards/avr/at90usb/micropendous3/src/micropendous3.h
index 92ee71e80d..bc413036c3 100644
--- a/boards/avr/at90usb/micropendous3/src/micropendous3.h
+++ b/boards/avr/at90usb/micropendous3/src/micropendous3.h
@@ -1,6 +1,8 @@
 /****************************************************************************
  * boards/avr/at90usb/micropendous3/src/micropendous3.h
  *
+ * SPDX-License-Identifier: Apache-2.0
+ *
  * Licensed to the Apache Software Foundation (ASF) under one or more
  * contributor license agreements.  See the NOTICE file distributed with
  * this work for additional information regarding copyright ownership.  The
diff --git a/boards/avr/at90usb/teensy-2.0/include/board.h b/boards/avr/at90usb/teensy-2.0/include/board.h
index 054ab34c07..c1cfefc68b 100644
--- a/boards/avr/at90usb/teensy-2.0/include/board.h
+++ b/boards/avr/at90usb/teensy-2.0/include/board.h
@@ -1,6 +1,8 @@
 /****************************************************************************
  * boards/avr/at90usb/teensy-2.0/include/board.h
  *
+ * SPDX-License-Identifier: Apache-2.0
+ *
  * Licensed to the Apache Software Foundation (ASF) under one or more
  * contributor license agreements.  See the NOTICE file distributed with
  * this work for additional information regarding copyright ownership.  The
diff --git a/boards/avr/at90usb/teensy-2.0/scripts/Make.defs b/boards/avr/at90usb/teensy-2.0/scripts/Make.defs
index c63cbe8dc9..e993ecdb11 100644
--- a/boards/avr/at90usb/teensy-2.0/scripts/Make.defs
+++ b/boards/avr/at90usb/teensy-2.0/scripts/Make.defs
@@ -1,6 +1,8 @@
 ############################################################################
 # boards/avr/at90usb/teensy-2.0/scripts/Make.defs
 #
+# SPDX-License-Identifier: Apache-2.0
+#
 # Licensed to the Apache Software Foundation (ASF) under one or more
 # contributor license agreements.  See the NOTICE file distributed with
 # this work for additional information regarding copyright ownership.  The
diff --git a/boards/avr/at90usb/teensy-2.0/scripts/flash.ld b/boards/avr/at90usb/teensy-2.0/scripts/flash.ld
index a46e17a03e..b32bf0b635 100644
--- a/boards/avr/at90usb/teensy-2.0/scripts/flash.ld
+++ b/boards/avr/at90usb/teensy-2.0/scripts/flash.ld
@@ -1,6 +1,8 @@
 /****************************************************************************
  * boards/avr/at90usb/teensy-2.0/scripts/flash.ld
  *
+ * SPDX-License-Identifier: Apache-2.0
+ *
  * Licensed to the Apache Software Foundation (ASF) under one or more
  * contributor license agreements.  See the NOTICE file distributed with
  * this work for additional information regarding copyright ownership.  The
diff --git a/boards/avr/at90usb/teensy-2.0/src/Makefile b/boards/avr/at90usb/teensy-2.0/src/Makefile
index 0ffda84858..4955e097ac 100644
--- a/boards/avr/at90usb/teensy-2.0/src/Makefile
+++ b/boards/avr/at90usb/teensy-2.0/src/Makefile
@@ -1,6 +1,8 @@
 ############################################################################
 # boards/avr/at90usb/teensy-2.0/src/Makefile
 #
+# SPDX-License-Identifier: Apache-2.0
+#
 # Licensed to the Apache Software Foundation (ASF) under one or more
 # contributor license agreements.  See the NOTICE file distributed with
 # this work for additional information regarding copyright ownership.  The
diff --git a/boards/avr/at90usb/teensy-2.0/src/at90usb_appinit.c b/boards/avr/at90usb/teensy-2.0/src/at90usb_appinit.c
index c3812f35aa..5f9705159c 100644
--- a/boards/avr/at90usb/teensy-2.0/src/at90usb_appinit.c
+++ b/boards/avr/at90usb/teensy-2.0/src/at90usb_appinit.c
@@ -1,6 +1,8 @@
 /****************************************************************************
  * boards/avr/at90usb/teensy-2.0/src/at90usb_appinit.c
  *
+ * SPDX-License-Identifier: Apache-2.0
+ *
  * Licensed to the Apache Software Foundation (ASF) under one or more
  * contributor license agreements.  See the NOTICE file distributed with
  * this work for additional information regarding copyright ownership.  The
diff --git a/boards/avr/at90usb/teensy-2.0/src/at90usb_boot.c b/boards/avr/at90usb/teensy-2.0/src/at90usb_boot.c
index 6dd9e0b616..49aa3a62aa 100644
--- a/boards/avr/at90usb/teensy-2.0/src/at90usb_boot.c
+++ b/boards/avr/at90usb/teensy-2.0/src/at90usb_boot.c
@@ -1,6 +1,8 @@
 /****************************************************************************
  * boards/avr/at90usb/teensy-2.0/src/at90usb_boot.c
  *
+ * SPDX-License-Identifier: Apache-2.0
+ *
  * Licensed to the Apache Software Foundation (ASF) under one or more
  * contributor license agreements.  See the NOTICE file distributed with
  * this work for additional information regarding copyright ownership.  The
diff --git a/boards/avr/at90usb/teensy-2.0/src/at90usb_leds.c b/boards/avr/at90usb/teensy-2.0/src/at90usb_leds.c
index 5074cc6dc2..61b4f5c724 100644
--- a/boards/avr/at90usb/teensy-2.0/src/at90usb_leds.c
+++ b/boards/avr/at90usb/teensy-2.0/src/at90usb_leds.c
@@ -1,6 +1,8 @@
 /****************************************************************************
  * boards/avr/at90usb/teensy-2.0/src/at90usb_leds.c
  *
+ * SPDX-License-Identifier: Apache-2.0
+ *
  * Licensed to the Apache Software Foundation (ASF) under one or more
  * contributor license agreements.  See the NOTICE file distributed with
  * this work for additional information regarding copyright ownership.  The
diff --git a/boards/avr/at90usb/teensy-2.0/src/at90usb_spi.c b/boards/avr/at90usb/teensy-2.0/src/at90usb_spi.c
index 151f8954b6..db0b34a04a 100644
--- a/boards/avr/at90usb/teensy-2.0/src/at90usb_spi.c
+++ b/boards/avr/at90usb/teensy-2.0/src/at90usb_spi.c
@@ -1,6 +1,8 @@
 /****************************************************************************
  * boards/avr/at90usb/teensy-2.0/src/at90usb_spi.c
  *
+ * SPDX-License-Identifier: Apache-2.0
+ *
  * Licensed to the Apache Software Foundation (ASF) under one or more
  * contributor license agreements.  See the NOTICE file distributed with
  * this work for additional information regarding copyright ownership.  The
diff --git a/boards/avr/at90usb/teensy-2.0/src/at90usb_usbmsc.c b/boards/avr/at90usb/teensy-2.0/src/at90usb_usbmsc.c
index 6061690e93..0fcd615feb 100644
--- a/boards/avr/at90usb/teensy-2.0/src/at90usb_usbmsc.c
+++ b/boards/avr/at90usb/teensy-2.0/src/at90usb_usbmsc.c
@@ -1,6 +1,8 @@
 /****************************************************************************
  * boards/avr/at90usb/teensy-2.0/src/at90usb_usbmsc.c
  *
+ * SPDX-License-Identifier: Apache-2.0
+ *
  * Licensed to the Apache Software Foundation (ASF) under one or more
  * contributor license agreements.  See the NOTICE file distributed with
  * this work for additional information regarding copyright ownership.  The
diff --git a/boards/avr/at90usb/teensy-2.0/src/teensy-20.h b/boards/avr/at90usb/teensy-2.0/src/teensy-20.h
index 8855114dc0..45f355537f 100644
--- a/boards/avr/at90usb/teensy-2.0/src/teensy-20.h
+++ b/boards/avr/at90usb/teensy-2.0/src/teensy-20.h
@@ -1,6 +1,8 @@
 /****************************************************************************
  * boards/avr/at90usb/teensy-2.0/src/teensy-20.h
  *
+ * SPDX-License-Identifier: Apache-2.0
+ *
  * Licensed to the Apache Software Foundation (ASF) under one or more
  * contributor license agreements.  See the NOTICE file distributed with
  * this work for additional information regarding copyright ownership.  The