firmware: set license to GPLv2+
Change-Id: Id4c00159f984976b6d8641900fb64e36a3a30407
diff --git a/firmware/libcommon/source/usb_buf.c b/firmware/libcommon/source/usb_buf.c
index b8d4dd7..418569e 100644
--- a/firmware/libcommon/source/usb_buf.c
+++ b/firmware/libcommon/source/usb_buf.c
@@ -1,3 +1,19 @@
+/* USB buffer library
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program 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 General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307, USA
+ */
#include "board.h"
#include "trace.h"
#include "usb_buf.h"