diff --git a/hw/xbox/adpcm.h b/hw/xbox/adpcm.h
index f88b01fb96..e59c5c2bfc 100644
--- a/hw/xbox/adpcm.h
+++ b/hw/xbox/adpcm.h
@@ -1,3 +1,23 @@
+/*
+ * ADPCM decoder
+ *
+ * Copyright (c) 2017 Jannik Vogel
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2 of the License, or (at your option) any later version.
+ *
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this library; if not, see .
+ */
+
+
// See https://wiki.multimedia.cx/index.php/IMA_ADPCM for more information
#include
diff --git a/hw/xbox/adpcm_block.h b/hw/xbox/adpcm_block.h
index efdfc6b7b5..5c7516a509 100644
--- a/hw/xbox/adpcm_block.h
+++ b/hw/xbox/adpcm_block.h
@@ -1,3 +1,22 @@
+/*
+ * ADPCM decoder
+ *
+ * Copyright (c) 2017 Jannik Vogel
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2 of the License, or (at your option) any later version.
+ *
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this library; if not, see .
+ */
+
#include "adpcm.h"
static int16_t adpcm_decode_block_setup(ADPCMDecoder* decoder, uint32_t word) {