include: further adoption of SPDX licensing ID tags.

Mainly focus on files that use BSD 3-Clause license.

The Software Package Data Exchange (SPDX) group provides a specification
to make it easier for automated tools to detect and summarize well known
opensource licenses. We are gradually adopting the specification, noting
that the tags are considered only advisory and do not, in any way,
superceed or replace the license texts.

Special thanks to Wind River for providing access to "The Duke of
Highlander" tool: an older (2014) run over FreeBSD tree was useful as a
starting point.

include/_ctype.h

@@ -1,4 +1,6 @@
-/*
+/*-
+ * SPDX-License-Identifier: BSD-3-Clause
+ *
  * Copyright (c) 1989, 1993
  *	The Regents of the University of California.  All rights reserved.
  * (c) UNIX System Laboratories, Inc.

include/a.out.h

@@ -1,4 +1,6 @@
 /*-
+ * SPDX-License-Identifier: BSD-3-Clause
+ *
  * Copyright (c) 1991, 1993
  *	The Regents of the University of California.  All rights reserved.
  *

include/ar.h

@@ -1,4 +1,6 @@
 /*-
+ * SPDX-License-Identifier: BSD-3-Clause
+ *
  * Copyright (c) 1991, 1993
  *	The Regents of the University of California.  All rights reserved.
  * (c) UNIX System Laboratories, Inc.

include/arpa/ftp.h

@@ -1,4 +1,6 @@
-/*
+/*-
+ * SPDX-License-Identifier: BSD-3-Clause
+ *
  * Copyright (c) 1983, 1989, 1993
  *	The Regents of the University of California.  All rights reserved.
  *

include/arpa/inet.h

@@ -1,4 +1,6 @@
-/*
+/*-
+ * SPDX-License-Identifier: BSD-3-Clause
+ *
  * ++Copyright++ 1983, 1993
  * -
  * Copyright (c) 1983, 1993

include/arpa/nameser.h

@@ -15,7 +15,9 @@
  * PERFORMANCE OF THIS SOFTWARE.
  */
 
-/*
+/*-
+ * SPDX-License-Identifier: BSD-3-Clause
+ *
  * Copyright (c) 1983, 1989, 1993
  *    The Regents of the University of California.  All rights reserved.
  *

include/arpa/nameser_compat.h

@@ -1,4 +1,7 @@
-/* Copyright (c) 1983, 1989
+/*-
+ * SPDX-License-Identifier: BSD-3-Clause
+ *
+ * Copyright (c) 1983, 1989
  *    The Regents of the University of California.  All rights reserved.
  * 
  * Redistribution and use in source and binary forms, with or without

include/arpa/telnet.h

@@ -1,4 +1,6 @@
-/*
+/*-
+ * SPDX-License-Identifier: BSD-3-Clause
+ *
  * Copyright (c) 1983, 1993
  *	The Regents of the University of California.  All rights reserved.
  *

include/arpa/tftp.h

@@ -1,4 +1,6 @@
-/*
+/**-
+ * SPDX-License-Identifier: BSD-3-Clause
+ *
  * Copyright (c) 1983, 1993
  *	The Regents of the University of California.  All rights reserved.
  *

include/assert.h

@@ -1,4 +1,6 @@
 /*-
+ * SPDX-License-Identifier: BSD-3-Clause
+ *
  * Copyright (c) 1992, 1993
  *	The Regents of the University of California.  All rights reserved.
  * (c) UNIX System Laboratories, Inc.

include/ctype.h

@@ -1,4 +1,6 @@
-/*
+/*-
+ * SPDX-License-Identifier: BSD-3-Clause
+ *
  * Copyright (c) 1989, 1993
  *	The Regents of the University of California.  All rights reserved.
  * (c) UNIX System Laboratories, Inc.

include/db.h

@@ -1,4 +1,6 @@
 /*-
+ * SPDX-License-Identifier: BSD-3-Clause
+ *
  * Copyright (c) 1990, 1993, 1994
  *	The Regents of the University of California.  All rights reserved.
  *

include/dirent.h

@@ -1,4 +1,6 @@
 /*-
+ * SPDX-License-Identifier: BSD-3-Clause
+ *
  * Copyright (c) 1989, 1993
  *	The Regents of the University of California.  All rights reserved.
  *

include/dlfcn.h

@@ -1,4 +1,6 @@
 /*-
+ * SPDX-License-Identifier: BSD-3-Clause
+ *
  * Copyright (c) 1994
  *	The Regents of the University of California.  All rights reserved.
  *

include/err.h

@@ -1,4 +1,6 @@
 /*-
+ * SPDX-License-Identifier: BSD-3-Clause
+ *
  * Copyright (c) 1993
  *	The Regents of the University of California.  All rights reserved.
  *

include/fnmatch.h

@@ -1,4 +1,6 @@
 /*-
+ * SPDX-License-Identifier: BSD-3-Clause
+ *
  * Copyright (c) 1992, 1993
  *	The Regents of the University of California.  All rights reserved.
  *

include/fstab.h

@@ -1,4 +1,6 @@
-/*
+/*-
+ * SPDX-License-Identifier: BSD-3-Clause
+ *
  * Copyright (c) 1980, 1993
  *	The Regents of the University of California.  All rights reserved.
  *

include/fts.h

@@ -1,4 +1,6 @@
-/*
+/*-
+ * SPDX-License-Identifier: BSD-3-Clause
+ *
  * Copyright (c) 1989, 1993
  *	The Regents of the University of California.  All rights reserved.
  *

include/glob.h

@@ -1,4 +1,6 @@
-/*
+/*-
+ * SPDX-License-Identifier: BSD-3-Clause
+ *
  * Copyright (c) 1989, 1993
  *	The Regents of the University of California.  All rights reserved.
  *

include/grp.h

@@ -1,4 +1,6 @@
 /*-
+ * SPDX-License-Identifier: BSD-3-Clause
+ *
  * Copyright (c) 1989, 1993
  *	The Regents of the University of California.  All rights reserved.
  * (c) UNIX System Laboratories, Inc.

include/limits.h

@@ -1,4 +1,6 @@
 /*-
+ * SPDX-License-Identifier: BSD-3-Clause
+ *
  * Copyright (c) 1988, 1993
  *	The Regents of the University of California.  All rights reserved.
  *

include/locale.h

@@ -1,4 +1,6 @@
-/*
+/*-
+ * SPDX-License-Identifier: BSD-3-Clause
+ *
  * Copyright (c) 1991, 1993
  *	The Regents of the University of California.  All rights reserved.
  *

include/memory.h

@@ -1,4 +1,6 @@
-/*
+/*-
+ * SPDX-License-Identifier: BSD-3-Clause
+ *
  * Copyright (c) 1988, 1993
  *	The Regents of the University of California.  All rights reserved.
  *

include/mpool.h

@@ -1,4 +1,6 @@
 /*-
+ * SPDX-License-Identifier: BSD-3-Clause
+ *
  * Copyright (c) 1991, 1993, 1994
  *	The Regents of the University of California.  All rights reserved.
  *

include/ndbm.h

@@ -1,4 +1,6 @@
 /*-
+ * SPDX-License-Identifier: BSD-3-Clause
+ *
  * Copyright (c) 1990, 1993
  *	The Regents of the University of California.  All rights reserved.
  *

include/netdb.h

@@ -1,4 +1,6 @@
 /*-
+ * SPDX-License-Identifier: BSD-3-Clause
+ *
  * Copyright (c) 1980, 1983, 1988, 1993
  *	The Regents of the University of California.  All rights reserved.
  *

include/nlist.h

@@ -1,4 +1,6 @@
 /*-
+ * SPDX-License-Identifier: BSD-3-Clause
+ *
  * Copyright (c) 1991, 1993
  *	The Regents of the University of California.  All rights reserved.
  * (c) UNIX System Laboratories, Inc.

include/paths.h

@@ -1,4 +1,6 @@
-/*
+/*-
+ * SPDX-License-Identifier: BSD-3-Clause
+ *
  * Copyright (c) 1989, 1993
  *	The Regents of the University of California.  All rights reserved.
  *

include/protocols/dumprestore.h

@@ -1,4 +1,6 @@
-/*
+/*-
+ * SPDX-License-Identifier: BSD-3-Clause
+ *
  * Copyright (c) 1980, 1993
  *	The Regents of the University of California.  All rights reserved.
  * (c) UNIX System Laboratories, Inc.

include/protocols/routed.h

@@ -1,4 +1,6 @@
 /*-
+ * SPDX-License-Identifier: BSD-3-Clause
+ *
  * Copyright (c) 1983, 1989, 1993
  *	The Regents of the University of California.  All rights reserved.
  *

include/protocols/rwhod.h

@@ -1,4 +1,6 @@
-/*
+/*-
+ * SPDX-License-Identifier: BSD-3-Clause
+ *
  * Copyright (c) 1983, 1993
  *	The Regents of the University of California.  All rights reserved.
  *

include/protocols/talkd.h

@@ -1,4 +1,6 @@
-/*
+/*-
+ * SPDX-License-Identifier: BSD-3-Clause
+ *
  * Copyright (c) 1983, 1993
  *	The Regents of the University of California.  All rights reserved.
  *

include/protocols/timed.h

@@ -1,4 +1,6 @@
-/*
+/*-
+ * SPDX-License-Identifier: BSD-3-Clause
+ *
  * Copyright (c) 1983, 1993
  *	The Regents of the University of California.  All rights reserved.
  *

include/pthread_np.h

@@ -1,4 +1,6 @@
-/*
+/*-
+ * SPDX-License-Identifier: BSD-3-Clause
+ *
  * Copyright (c) 1996-98 John Birrell <jb@cimlogic.com.au>.
  * All rights reserved.
  *

include/pwd.h

@@ -1,4 +1,6 @@
 /*-
+ * SPDX-License-Identifier: BSD-3-Clause
+ *
  * Copyright (c) 1989, 1993
  *	The Regents of the University of California.  All rights reserved.
  * (c) UNIX System Laboratories, Inc.

include/ranlib.h

@@ -1,4 +1,6 @@
 /*-
+ * SPDX-License-Identifier: BSD-3-Clause
+ *
  * Copyright (c) 1990, 1993
  *	The Regents of the University of California.  All rights reserved.
  *

include/regex.h

@@ -1,4 +1,6 @@
 /*-
+ * SPDX-License-Identifier: BSD-3-Clause
+ *
  * Copyright (c) 1992 Henry Spencer.
  * Copyright (c) 1992, 1993
  *	The Regents of the University of California.  All rights reserved.

include/resolv.h

@@ -1,4 +1,6 @@
-/*
+/*-
+ * SPDX-License-Identifier: BSD-3-Clause
+ *
  * Portions Copyright (C) 2004, 2005, 2008, 2009  Internet Systems Consortium, Inc. ("ISC")
  * Portions Copyright (C) 1995-2003  Internet Software Consortium.
  *

include/rpc/auth.h

@@ -1,6 +1,8 @@
 /*	$NetBSD: auth.h,v 1.15 2000/06/02 22:57:55 fvdl Exp $	*/
 
 /*-
+ * SPDX-License-Identifier: BSD-3-Clause
+ *
  * Copyright (c) 2009, Sun Microsystems, Inc.
  * All rights reserved.
  *

include/rpc/auth_des.h

@@ -1,6 +1,8 @@
 /*	@(#)auth_des.h	2.2 88/07/29 4.0 RPCSRC; from 1.3 88/02/08 SMI */
 /*	$FreeBSD$ */
 /*-
+ * SPDX-License-Identifier: BSD-3-Clause
+ *
  * Copyright (c) 2009, Sun Microsystems, Inc.
  * All rights reserved.
  *

include/rpc/auth_kerb.h

@@ -1,5 +1,7 @@
 /*	$FreeBSD$ */
 /*-
+ * SPDX-License-Identifier: BSD-3-Clause
+ *
  * Copyright (c) 2009, Sun Microsystems, Inc.
  * All rights reserved.
  *

include/rpc/auth_unix.h

@@ -1,4 +1,6 @@
 /*-
+ * SPDX-License-Identifier: BSD-3-Clause
+ *
  * Copyright (c) 2009, Sun Microsystems, Inc.
  * All rights reserved.
  *

include/rpc/clnt.h

@@ -1,6 +1,8 @@
 /*	$NetBSD: clnt.h,v 1.14 2000/06/02 22:57:55 fvdl Exp $	*/
 
 /*-
+ * SPDX-License-Identifier: BSD-3-Clause
+ *
  * Copyright (c) 2010, Oracle America, Inc.
  * All rights reserved.
  *

include/rpc/clnt_soc.h

@@ -2,6 +2,8 @@
 /*	$FreeBSD$ */
 
 /*-
+ * SPDX-License-Identifier: BSD-3-Clause
+ *
  * Copyright (c) 2009, Sun Microsystems, Inc.
  * All rights reserved.
  *

include/rpc/des.h

@@ -1,6 +1,8 @@
 /*  @(#)des.h	2.2 88/08/10 4.0 RPCSRC; from 2.7 88/02/08 SMI  */
 /* $FreeBSD$ */
 /*-
+ * SPDX-License-Identifier: BSD-3-Clause
+ *
  * Copyright (c) 2009, Sun Microsystems, Inc.
  * All rights reserved.
  *

include/rpc/des_crypt.h

@@ -6,6 +6,8 @@
  * Copyright (C) 1986, Sun Microsystems, Inc.
  */
 /*-
+ * SPDX-License-Identifier: BSD-3-Clause
+ *
  * Copyright (c) 2009, Sun Microsystems, Inc.
  * All rights reserved.
  *

include/rpc/nettype.h

@@ -2,6 +2,8 @@
 /*	$FreeBSD$ */
 
 /*-
+ * SPDX-License-Identifier: BSD-3-Clause
+ *
  * Copyright (c) 2009, Sun Microsystems, Inc.
  * All rights reserved.
  *

include/rpc/pmap_clnt.h

@@ -1,6 +1,8 @@
 /*	$NetBSD: pmap_clnt.h,v 1.9 2000/06/02 22:57:55 fvdl Exp $	*/
 
 /*-
+ * SPDX-License-Identifier: BSD-3-Clause
+ *
  * Copyright (c) 2009, Sun Microsystems, Inc.
  * All rights reserved.
  *

include/rpc/pmap_prot.h

@@ -1,6 +1,8 @@
 /*	$NetBSD: pmap_prot.h,v 1.8 2000/06/02 22:57:55 fvdl Exp $	*/
 
 /*-
+ * SPDX-License-Identifier: BSD-3-Clause
+ *
  * Copyright (c) 2009, Sun Microsystems, Inc.
  * All rights reserved.
  *

include/rpc/pmap_rmt.h

@@ -1,6 +1,8 @@
 /*	$NetBSD: pmap_rmt.h,v 1.7 1998/02/11 23:01:23 lukem Exp $	*/
 
 /*-
+ * SPDX-License-Identifier: BSD-3-Clause
+ *
  * Copyright (c) 2009, Sun Microsystems, Inc.
  * All rights reserved.
  *

include/rpc/raw.h

@@ -2,6 +2,8 @@
 /*	$FreeBSD$ */
 
 /*-
+ * SPDX-License-Identifier: BSD-3-Clause
+ *
  * Copyright (c) 2009, Sun Microsystems, Inc.
  * All rights reserved.
  *

include/rpc/rpc.h

@@ -1,6 +1,8 @@
 /*	$NetBSD: rpc.h,v 1.13 2000/06/02 22:57:56 fvdl Exp $	*/
 
 /*-
+ * SPDX-License-Identifier: BSD-3-Clause
+ *
  * Copyright (c) 2009, Sun Microsystems, Inc.
  * All rights reserved.
  *

include/rpc/rpc_com.h

@@ -2,6 +2,8 @@
 /*	$FreeBSD$ */
 
 /*-
+ * SPDX-License-Identifier: BSD-3-Clause
+ *
  * Copyright (c) 2009, Sun Microsystems, Inc.
  * All rights reserved.
  *

include/rpc/rpc_msg.h

@@ -1,6 +1,8 @@
 /*	$NetBSD: rpc_msg.h,v 1.11 2000/06/02 22:57:56 fvdl Exp $	*/
 
 /*-
+ * SPDX-License-Identifier: BSD-3-Clause
+ *
  * Copyright (c) 2009, Sun Microsystems, Inc.
  * All rights reserved.
  *

include/rpc/rpcb_clnt.h

@@ -2,6 +2,8 @@
 /*	$FreeBSD$ */
 
 /*-
+ * SPDX-License-Identifier: BSD-3-Clause
+ *
  * Copyright (c) 2009, Sun Microsystems, Inc.
  * All rights reserved.
  *

include/rpc/rpcent.h

@@ -2,6 +2,8 @@
 /*	$FreeBSD$ */
 
 /*-
+ * SPDX-License-Identifier: BSD-3-Clause
+ *
  * Copyright (c) 2009, Sun Microsystems, Inc.
  * All rights reserved.
  *

include/rpc/svc.h

@@ -1,6 +1,8 @@
 /*	$NetBSD: svc.h,v 1.17 2000/06/02 22:57:56 fvdl Exp $	*/
 
 /*-
+ * SPDX-License-Identifier: BSD-3-Clause
+ *
  * Copyright (c) 2009, Sun Microsystems, Inc.
  * All rights reserved.
  *

include/rpc/svc_auth.h

@@ -1,6 +1,8 @@
 /*	$NetBSD: svc_auth.h,v 1.8 2000/06/02 22:57:57 fvdl Exp $	*/
 
 /*-
+ * SPDX-License-Identifier: BSD-3-Clause
+ *
  * Copyright (c) 2009, Sun Microsystems, Inc.
  * All rights reserved.
  *

include/rpc/svc_dg.h

@@ -2,6 +2,8 @@
 /*	$FreeBSD$ */
 
 /*-
+ * SPDX-License-Identifier: BSD-3-Clause
+ *
  * Copyright (c) 2009, Sun Microsystems, Inc.
  * All rights reserved.
  *

include/rpc/svc_soc.h

@@ -2,6 +2,8 @@
 /*	$FreeBSD$ */
 
 /*-
+ * SPDX-License-Identifier: BSD-3-Clause
+ *
  * Copyright (c) 2009, Sun Microsystems, Inc.
  * All rights reserved.
  *

include/rpc/xdr.h

@@ -1,6 +1,8 @@
 /*	$NetBSD: xdr.h,v 1.19 2000/07/17 05:00:45 matt Exp $	*/
 
 /*-
+ * SPDX-License-Identifier: BSD-3-Clause
+ *
  * Copyright (c) 2009, Sun Microsystems, Inc.
  * All rights reserved.
  *

include/rpcsvc/nis_tags.h

@@ -1,4 +1,6 @@
 /*-
+ * SPDX-License-Identifier: BSD-3-Clause
+ *
  * Copyright (c) 2010, Oracle America, Inc.
  *
  * Redistribution and use in source and binary forms, with or without

include/runetype.h

@@ -1,4 +1,6 @@
 /*-
+ * SPDX-License-Identifier: BSD-3-Clause
+ *
  * Copyright (c) 1993
  *	The Regents of the University of California.  All rights reserved.
  *

include/setjmp.h

@@ -1,4 +1,6 @@
 /*-
+ * SPDX-License-Identifier: BSD-3-Clause
+ *
  * Copyright (c) 1990, 1993
  *	The Regents of the University of California.  All rights reserved.
  * (c) UNIX System Laboratories, Inc.

include/signal.h

@@ -1,4 +1,6 @@
 /*-
+ * SPDX-License-Identifier: BSD-3-Clause
+ *
  * Copyright (c) 1991, 1993
  *	The Regents of the University of California.  All rights reserved.
  *

include/stab.h

@@ -1,4 +1,6 @@
 /*-
+ * SPDX-License-Identifier: BSD-3-Clause
+ *
  * Copyright (c) 1991, 1993
  *	The Regents of the University of California.  All rights reserved.
  *

include/stddef.h

@@ -1,4 +1,6 @@
 /*-
+ * SPDX-License-Identifier: BSD-3-Clause
+ *
  * Copyright (c) 1990, 1993
  *	The Regents of the University of California.  All rights reserved.
  *

include/stdio.h

@@ -1,4 +1,6 @@
 /*-
+ * SPDX-License-Identifier: BSD-3-Clause
+ *
  * Copyright (c) 1990, 1993
  *	The Regents of the University of California.  All rights reserved.
  *

include/stdlib.h

@@ -1,4 +1,6 @@
 /*-
+ * SPDX-License-Identifier: BSD-3-Clause
+ *
  * Copyright (c) 1990, 1993
  *	The Regents of the University of California.  All rights reserved.
  *

include/string.h

@@ -1,4 +1,6 @@
 /*-
+ * SPDX-License-Identifier: BSD-3-Clause
+ *
  * Copyright (c) 1990, 1993
  *	The Regents of the University of California.  All rights reserved.
  *

include/sysexits.h

@@ -1,4 +1,6 @@
-/*
+/*-
+ * SPDX-License-Identifier: BSD-3-Clause
+ *
  * Copyright (c) 1987, 1993
  *	The Regents of the University of California.  All rights reserved.
  *

include/tar.h

@@ -1,4 +1,6 @@
 /*-
+ * SPDX-License-Identifier: BSD-3-Clause
+ *
  * Copyright (c) 1994
  *	The Regents of the University of California.  All rights reserved.
  *

include/termios.h

@@ -1,4 +1,6 @@
 /*-
+ * SPDX-License-Identifier: BSD-3-Clause
+ *
  * Copyright (c) 1988, 1989, 1993, 1994
  *	The Regents of the University of California.  All rights reserved.
  *

include/time.h

@@ -1,4 +1,6 @@
-/*
+/*-
+ * SPDX-License-Identifier: BSD-3-Clause
+ *
  * Copyright (c) 1989, 1993
  *	The Regents of the University of California.  All rights reserved.
  * (c) UNIX System Laboratories, Inc.

include/timeconv.h

@@ -1,4 +1,6 @@
-/*
+/*-
+ * SPDX-License-Identifier: BSD-3-Clause
+ *
  * Copyright (c) 1989, 1993
  *	The Regents of the University of California.  All rights reserved.
  * (c) UNIX System Laboratories, Inc.

include/ttyent.h

@@ -1,4 +1,6 @@
-/*
+/*-
+ * SPDX-License-Identifier: BSD-3-Clause
+ *
  * Copyright (c) 1989, 1993
  *	The Regents of the University of California.  All rights reserved.
  *

include/unistd.h

@@ -1,4 +1,6 @@
 /*-
+ * SPDX-License-Identifier: BSD-3-Clause
+ *
  * Copyright (c) 1991, 1993, 1994
  *	The Regents of the University of California.  All rights reserved.
  *

include/utime.h

@@ -1,4 +1,6 @@
 /*-
+ * SPDX-License-Identifier: BSD-3-Clause
+ *
  * Copyright (c) 1990, 1993
  *	The Regents of the University of California.  All rights reserved.
  *