[Qemu-devel] [PATCH] slirp: clarify license of slirp as BSD-3

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[Qemu-devel] [PATCH] slirp: clarify license of slirp as BSD-3

From:	Marc-André Lureau
Subject:	[Qemu-devel] [PATCH] slirp: clarify license of slirp as BSD-3
Date:	Wed, 13 Mar 2019 13:38:50 +0100
In order to make slirp a standalone project, the project must have a
clear license, and be compatible with the GPL or LGPL.

Since commit 2f5f89963186d42a7ded253bc6cf5b32abb45cec ("Remove the
advertising clause from the slirp license"), slirp is BSD-3. But new
files have been added under slirp/ with QEMU GPL license since then.

The copyright holders have been asked to relicense files to BSD-3:

- slirp/dhcpv6.{c,h}

Subject: Re: Clearing slirp/ license
To: "Marc-André Lureau" <address@hidden>, QEMU <address@hidden>, Thomas Huth 
<address@hidden>
Cc: Peter Maydell <address@hidden>, Samuel Thibault <address@hidden>
References: <address@hidden>
From: "Cédric Le Goater" <address@hidden>
Message-ID: <address@hidden>
Date: Mon, 11 Mar 2019 16:23:25 +0100

> Could you reply that you have no objection in relicensing those files
> are 3-Clause BSD?

Fine for me. You can change the license of slirp/ncsi.c and
slirp/ncsi-pkt.hto a 3-Clause BSD.

Thanks,

C.

Subject: Re: [Qemu-devel] Clearing slirp/ license
To: Peter Maydell <address@hidden>, Shan Gavin <address@hidden>
Cc: Alexey Kardashevskiy <address@hidden>, "Marc-André Lureau" 
<address@hidden>, Gavin Shan <address@hidden>, Thomas Huth <address@hidden>, 
QEMU <address@hidden>, Samuel Thibault <address@hidden>
References: <address@hidden> <address@hidden> <address@hidden> <address@hidden> 
<address@hidden> <address@hidden>
From: "Cédric Le Goater" <address@hidden>
Message-ID: <address@hidden>
Date: Tue, 12 Mar 2019 11:49:21 +0100

> Is the code in question copyright you personally, or copyright
> IBM as your employer at the time ? If the latter, it is IBM that
> would need to approve the relicensing.

That was done. I had our legal team approve the change of license.

Thanks,

C.

From: Shan Gavin <address@hidden>
Date: Tue, 12 Mar 2019 15:04:54 +0800
Message-ID: <address@hidden>
Subject: Re: [Qemu-devel] Clearing slirp/ license
To: Alexey Kardashevskiy <address@hidden>
Cc: "Marc-André Lureau" <address@hidden>, "Cédric Le Goater" <address@hidden>, 
address@hidden, Peter Maydell <address@hidden>, Thomas Huth <address@hidden>, 
QEMU <address@hidden>, Samuel Thibault <address@hidden>

> Gavin, could you reply that you have no objection in relicensing
> ncsi-pkt.h as 3-Clause BSD?

No objection. Please go ahead with the relicensing.

Cheers,
Gavin

- ncsi.c, ncsi-pkt.h

Subject: Re: Clearing slirp/ license
To: "Marc-André Lureau" <address@hidden>, QEMU <address@hidden>, "Cédric Le 
Goater" <address@hidden>
Cc: Peter Maydell <address@hidden>, Samuel Thibault <address@hidden>
References: <address@hidden>
From: Thomas Huth <address@hidden>
Message-ID: <address@hidden>
Date: Wed, 13 Feb 2019 12:30:32 +0100

> Could you reply that you have no objection in relicensing those files
> are 3-Clause BSD?

Ok, for the records: I'm fine if you change the license of dhcpv6.[ch]
to either 3-Clause BSD or 2-Clause BSD.

 Thomas

- vmstate.{c,h}

From: Juan Quintela <address@hidden>
To: "Marc-André Lureau" <address@hidden>
Cc: QEMU <address@hidden>, Peter Maydell <address@hidden>, Samuel Thibault 
<address@hidden>
Subject: Re: Clearing slirp/ license
Date: Tue, 12 Mar 2019 12:43:17 +0100
Message-ID: <address@hidden>

> Juan, Could you reply that you have no objection in relicensing the
> vmstate files as 3-Clause BSD?

No problem at all on my side.

Later, Juan.

Signed-off-by: Marc-André Lureau <address@hidden>
---
 slirp/src/bootp.h      |  1 +
 slirp/src/debug.h      |  4 +---
 slirp/src/dhcpv6.h     |  4 +---
 slirp/src/if.h         |  4 +---
 slirp/src/ip.h         | 30 ++----------------------------
 slirp/src/ip6.h        |  1 +
 slirp/src/ip6_icmp.h   |  1 +
 slirp/src/ip_icmp.h    | 30 ++----------------------------
 slirp/src/libslirp.h   |  1 +
 slirp/src/main.h       |  4 +---
 slirp/src/mbuf.h       | 30 ++----------------------------
 slirp/src/misc.h       |  4 +---
 slirp/src/ncsi-pkt.h   |  6 +-----
 slirp/src/qtailq.h     | 32 ++------------------------------
 slirp/src/sbuf.h       |  4 +---
 slirp/src/slirp.h      |  1 +
 slirp/src/socket.h     |  4 +---
 slirp/src/stream.h     |  1 +
 slirp/src/tcp.h        | 30 ++----------------------------
 slirp/src/tcp_var.h    | 30 ++----------------------------
 slirp/src/tcpip.h      | 30 ++----------------------------
 slirp/src/tftp.h       |  1 +
 slirp/src/udp.h        | 30 ++----------------------------
 slirp/src/util.h       | 19 +------------------
 slirp/src/vmstate.h    | 19 +------------------
 slirp/src/arp_table.c  | 19 +------------------
 slirp/src/bootp.c      | 19 +------------------
 slirp/src/cksum.c      | 30 ++----------------------------
 slirp/src/dhcpv6.c     | 14 +-------------
 slirp/src/dnssearch.c  | 19 +------------------
 slirp/src/if.c         |  4 +---
 slirp/src/ip6_icmp.c   |  1 +
 slirp/src/ip6_input.c  |  1 +
 slirp/src/ip6_output.c |  1 +
 slirp/src/ip_icmp.c    | 30 ++----------------------------
 slirp/src/ip_input.c   | 35 ++---------------------------------
 slirp/src/ip_output.c  | 35 ++---------------------------------
 slirp/src/mbuf.c       |  4 +---
 slirp/src/misc.c       |  4 +---
 slirp/src/ncsi.c       |  4 +---
 slirp/src/ndp_table.c  |  1 +
 slirp/src/sbuf.c       |  4 +---
 slirp/src/slirp.c      | 19 +------------------
 slirp/src/socket.c     |  4 +---
 slirp/src/state.c      | 19 +------------------
 slirp/src/stream.c     | 19 +------------------
 slirp/src/tcp_input.c  | 33 ++-------------------------------
 slirp/src/tcp_output.c | 33 ++-------------------------------
 slirp/src/tcp_subr.c   | 33 ++-------------------------------
 slirp/src/tcp_timer.c  | 30 ++----------------------------
 slirp/src/tftp.c       | 19 +------------------
 slirp/src/udp.c        | 33 ++-------------------------------
 slirp/src/udp6.c       |  1 +
 slirp/src/util.c       | 19 +------------------
 slirp/src/vmstate.c    |  4 +---
 55 files changed, 72 insertions(+), 740 deletions(-)

diff --git a/slirp/src/bootp.h b/slirp/src/bootp.h
index 4043489835..d881ad620a 100644
--- a/slirp/src/bootp.h
+++ b/slirp/src/bootp.h
@@ -1,3 +1,4 @@
+/* SPDX-License-Identifier: BSD-3-Clause */
 /* bootp/dhcp defines */
 
 #ifndef SLIRP_BOOTP_H
diff --git a/slirp/src/debug.h b/slirp/src/debug.h
index 44d922df37..c95fd8ffd2 100644
--- a/slirp/src/debug.h
+++ b/slirp/src/debug.h
@@ -1,8 +1,6 @@
+/* SPDX-License-Identifier: BSD-3-Clause */
 /*
  * Copyright (c) 1995 Danny Gasparovski.
- *
- * Please read the file COPYRIGHT for the
- * terms and conditions of the copyright.
  */
 
 #ifndef DEBUG_H_
diff --git a/slirp/src/dhcpv6.h b/slirp/src/dhcpv6.h
index 3373f6cb89..8b5ad064f0 100644
--- a/slirp/src/dhcpv6.h
+++ b/slirp/src/dhcpv6.h
@@ -1,10 +1,8 @@
+/* SPDX-License-Identifier: BSD-3-Clause */
 /*
  * Definitions and prototypes for SLIRP stateless DHCPv6
  *
  * Copyright 2016 Thomas Huth, Red Hat Inc.
- *
- * This work is licensed under the terms of the GNU GPL, version 2
- * or later. See the COPYING file in the top-level directory.
  */
 #ifndef SLIRP_DHCPV6_H
 #define SLIRP_DHCPV6_H
diff --git a/slirp/src/if.h b/slirp/src/if.h
index 69569c10df..b71c37d6ea 100644
--- a/slirp/src/if.h
+++ b/slirp/src/if.h
@@ -1,8 +1,6 @@
+/* SPDX-License-Identifier: BSD-3-Clause */
 /*
  * Copyright (c) 1995 Danny Gasparovski.
- *
- * Please read the file COPYRIGHT for the
- * terms and conditions of the copyright.
  */
 
 #ifndef IF_H
diff --git a/slirp/src/ip.h b/slirp/src/ip.h
index 73a4d2a3d2..bc6a26eba5 100644
--- a/slirp/src/ip.h
+++ b/slirp/src/ip.h
@@ -1,33 +1,7 @@
+/* SPDX-License-Identifier: BSD-3-Clause */
 /*
  * Copyright (c) 1982, 1986, 1993
- *     The Regents of the University of California.  All rights reserved.
- *
- * Redistribution and use in source and binary forms, with or without
- * modification, are permitted provided that the following conditions
- * are met:
- * 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 the University nor the names of its contributors
- *    may be used to endorse or promote products derived from this software
- *    without specific prior written permission.
- *
- * THIS SOFTWARE IS PROVIDED BY THE REGENTS 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 REGENTS 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.
- *
- *     @(#)ip.h        8.1 (Berkeley) 6/10/93
- * ip.h,v 1.3 1994/08/21 05:27:30 paul Exp
+ * The Regents of the University of California.  All rights reserved.
  */
 
 #ifndef IP_H
diff --git a/slirp/src/ip6.h b/slirp/src/ip6.h
index 1b3364f960..33683c8e20 100644
--- a/slirp/src/ip6.h
+++ b/slirp/src/ip6.h
@@ -1,3 +1,4 @@
+/* SPDX-License-Identifier: BSD-3-Clause */
 /*
  * Copyright (c) 2013
  * Guillaume Subiron, Yann Bordenave, Serigne Modou Wagne.
diff --git a/slirp/src/ip6_icmp.h b/slirp/src/ip6_icmp.h
index e8ed753db5..d8d13e30fc 100644
--- a/slirp/src/ip6_icmp.h
+++ b/slirp/src/ip6_icmp.h
@@ -1,3 +1,4 @@
+/* SPDX-License-Identifier: BSD-3-Clause */
 /*
  * Copyright (c) 2013
  * Guillaume Subiron, Yann Bordenave, Serigne Modou Wagne.
diff --git a/slirp/src/ip_icmp.h b/slirp/src/ip_icmp.h
index a4e5b8b265..765943c1d1 100644
--- a/slirp/src/ip_icmp.h
+++ b/slirp/src/ip_icmp.h
@@ -1,33 +1,7 @@
+/* SPDX-License-Identifier: BSD-3-Clause */
 /*
  * Copyright (c) 1982, 1986, 1993
- *     The Regents of the University of California.  All rights reserved.
- *
- * Redistribution and use in source and binary forms, with or without
- * modification, are permitted provided that the following conditions
- * are met:
- * 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 the University nor the names of its contributors
- *    may be used to endorse or promote products derived from this software
- *    without specific prior written permission.
- *
- * THIS SOFTWARE IS PROVIDED BY THE REGENTS 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 REGENTS 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.
- *
- *     @(#)ip_icmp.h   8.1 (Berkeley) 6/10/93
- * ip_icmp.h,v 1.4 1995/05/30 08:09:43 rgrimes Exp
+ * The Regents of the University of California.  All rights reserved.
  */
 
 #ifndef NETINET_IP_ICMP_H
diff --git a/slirp/src/libslirp.h b/slirp/src/libslirp.h
index 2d13950065..3b28764bec 100644
--- a/slirp/src/libslirp.h
+++ b/slirp/src/libslirp.h
@@ -1,3 +1,4 @@
+/* SPDX-License-Identifier: BSD-3-Clause */
 #ifndef LIBSLIRP_H
 #define LIBSLIRP_H
 
diff --git a/slirp/src/main.h b/slirp/src/main.h
index f11d4572b7..3b3f883703 100644
--- a/slirp/src/main.h
+++ b/slirp/src/main.h
@@ -1,8 +1,6 @@
+/* SPDX-License-Identifier: BSD-3-Clause */
 /*
  * Copyright (c) 1995 Danny Gasparovski.
- *
- * Please read the file COPYRIGHT for the
- * terms and conditions of the copyright.
  */
 
 #ifndef SLIRP_MAIN_H
diff --git a/slirp/src/mbuf.h b/slirp/src/mbuf.h
index e2d443418a..b618c75cba 100644
--- a/slirp/src/mbuf.h
+++ b/slirp/src/mbuf.h
@@ -1,33 +1,7 @@
+/* SPDX-License-Identifier: BSD-3-Clause */
 /*
  * Copyright (c) 1982, 1986, 1988, 1993
- *     The Regents of the University of California.  All rights reserved.
- *
- * Redistribution and use in source and binary forms, with or without
- * modification, are permitted provided that the following conditions
- * are met:
- * 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 the University nor the names of its contributors
- *    may be used to endorse or promote products derived from this software
- *    without specific prior written permission.
- *
- * THIS SOFTWARE IS PROVIDED BY THE REGENTS 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 REGENTS 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.
- *
- *     @(#)mbuf.h      8.3 (Berkeley) 1/21/94
- * mbuf.h,v 1.9 1994/11/14 13:54:20 bde Exp
+ * The Regents of the University of California.  All rights reserved.
  */
 
 #ifndef MBUF_H
diff --git a/slirp/src/misc.h b/slirp/src/misc.h
index c2ceadb591..23b7490448 100644
--- a/slirp/src/misc.h
+++ b/slirp/src/misc.h
@@ -1,8 +1,6 @@
+/* SPDX-License-Identifier: BSD-3-Clause */
 /*
  * Copyright (c) 1995 Danny Gasparovski.
- *
- * Please read the file COPYRIGHT for the
- * terms and conditions of the copyright.
  */
 
 #ifndef MISC_H
diff --git a/slirp/src/ncsi-pkt.h b/slirp/src/ncsi-pkt.h
index ea07d1cd0f..aced7960ea 100644
--- a/slirp/src/ncsi-pkt.h
+++ b/slirp/src/ncsi-pkt.h
@@ -1,10 +1,6 @@
+/* SPDX-License-Identifier: BSD-3-Clause */
 /*
  * Copyright Gavin Shan, IBM Corporation 2016.
- *
- * 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.
  */
 
 #ifndef NCSI_PKT_H
diff --git a/slirp/src/qtailq.h b/slirp/src/qtailq.h
index a89b0c439a..a809692625 100644
--- a/slirp/src/qtailq.h
+++ b/slirp/src/qtailq.h
@@ -1,38 +1,10 @@
-/*      $NetBSD: queue.h,v 1.52 2009/04/20 09:56:08 mschuett Exp $ */
+/* SPDX-License-Identifier: BSD-3-Clause */
 
 /*
  * slirp version: Copy from QEMU, removed all but tail queues.
- */
-
-/*
+ *
  * Copyright (c) 1991, 1993
  *      The Regents of the University of California.  All rights reserved.
- *
- * Redistribution and use in source and binary forms, with or without
- * modification, are permitted provided that the following conditions
- * are met:
- * 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 the University nor the names of its contributors
- *    may be used to endorse or promote products derived from this software
- *    without specific prior written permission.
- *
- * THIS SOFTWARE IS PROVIDED BY THE REGENTS 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 REGENTS 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.
- *
- *      @(#)queue.h     8.5 (Berkeley) 8/20/94
  */
 
 #ifndef QTAILQ_H
diff --git a/slirp/src/sbuf.h b/slirp/src/sbuf.h
index 1cb9a42834..337af1bbde 100644
--- a/slirp/src/sbuf.h
+++ b/slirp/src/sbuf.h
@@ -1,8 +1,6 @@
+/* SPDX-License-Identifier: BSD-3-Clause */
 /*
  * Copyright (c) 1995 Danny Gasparovski.
- *
- * Please read the file COPYRIGHT for the
- * terms and conditions of the copyright.
  */
 
 #ifndef SBUF_H
diff --git a/slirp/src/slirp.h b/slirp/src/slirp.h
index 8068ba1d1e..39580934f3 100644
--- a/slirp/src/slirp.h
+++ b/slirp/src/slirp.h
@@ -1,3 +1,4 @@
+/* SPDX-License-Identifier: BSD-3-Clause */
 #ifndef SLIRP_H
 #define SLIRP_H
 
diff --git a/slirp/src/socket.h b/slirp/src/socket.h
index e4d12cd591..25403898cd 100644
--- a/slirp/src/socket.h
+++ b/slirp/src/socket.h
@@ -1,8 +1,6 @@
+/* SPDX-License-Identifier: BSD-3-Clause */
 /*
  * Copyright (c) 1995 Danny Gasparovski.
- *
- * Please read the file COPYRIGHT for the
- * terms and conditions of the copyright.
  */
 
 #ifndef SLIRP_SOCKET_H
diff --git a/slirp/src/stream.h b/slirp/src/stream.h
index 985334c043..08bb5b6610 100644
--- a/slirp/src/stream.h
+++ b/slirp/src/stream.h
@@ -1,3 +1,4 @@
+/* SPDX-License-Identifier: BSD-3-Clause */
 #ifndef STREAM_H_
 #define STREAM_H_
 
diff --git a/slirp/src/tcp.h b/slirp/src/tcp.h
index 47aaea6c5b..07ac4a5db5 100644
--- a/slirp/src/tcp.h
+++ b/slirp/src/tcp.h
@@ -1,33 +1,7 @@
+/* SPDX-License-Identifier: BSD-3-Clause */
 /*
  * Copyright (c) 1982, 1986, 1993
- *     The Regents of the University of California.  All rights reserved.
- *
- * Redistribution and use in source and binary forms, with or without
- * modification, are permitted provided that the following conditions
- * are met:
- * 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 the University nor the names of its contributors
- *    may be used to endorse or promote products derived from this software
- *    without specific prior written permission.
- *
- * THIS SOFTWARE IS PROVIDED BY THE REGENTS 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 REGENTS 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.
- *
- *     @(#)tcp.h       8.1 (Berkeley) 6/10/93
- * tcp.h,v 1.3 1994/08/21 05:27:34 paul Exp
+ * The Regents of the University of California.  All rights reserved.
  */
 
 #ifndef TCP_H
diff --git a/slirp/src/tcp_var.h b/slirp/src/tcp_var.h
index 27ef1a51cb..1c59e0dba3 100644
--- a/slirp/src/tcp_var.h
+++ b/slirp/src/tcp_var.h
@@ -1,33 +1,7 @@
+/* SPDX-License-Identifier: BSD-3-Clause */
 /*
  * Copyright (c) 1982, 1986, 1993, 1994
- *     The Regents of the University of California.  All rights reserved.
- *
- * Redistribution and use in source and binary forms, with or without
- * modification, are permitted provided that the following conditions
- * are met:
- * 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 the University nor the names of its contributors
- *    may be used to endorse or promote products derived from this software
- *    without specific prior written permission.
- *
- * THIS SOFTWARE IS PROVIDED BY THE REGENTS 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 REGENTS 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.
- *
- *     @(#)tcp_var.h   8.3 (Berkeley) 4/10/94
- * tcp_var.h,v 1.3 1994/08/21 05:27:39 paul Exp
+ * The Regents of the University of California.  All rights reserved.
  */
 
 #ifndef TCP_VAR_H
diff --git a/slirp/src/tcpip.h b/slirp/src/tcpip.h
index 07dbf2c432..ff115a2718 100644
--- a/slirp/src/tcpip.h
+++ b/slirp/src/tcpip.h
@@ -1,33 +1,7 @@
+/* SPDX-License-Identifier: BSD-3-Clause */
 /*
  * Copyright (c) 1982, 1986, 1993
- *     The Regents of the University of California.  All rights reserved.
- *
- * Redistribution and use in source and binary forms, with or without
- * modification, are permitted provided that the following conditions
- * are met:
- * 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 the University nor the names of its contributors
- *    may be used to endorse or promote products derived from this software
- *    without specific prior written permission.
- *
- * THIS SOFTWARE IS PROVIDED BY THE REGENTS 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 REGENTS 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.
- *
- *     @(#)tcpip.h     8.1 (Berkeley) 6/10/93
- * tcpip.h,v 1.3 1994/08/21 05:27:40 paul Exp
+ * The Regents of the University of California.  All rights reserved.
  */
 
 #ifndef TCPIP_H
diff --git a/slirp/src/tftp.h b/slirp/src/tftp.h
index a4c4a64e64..3fe3b70205 100644
--- a/slirp/src/tftp.h
+++ b/slirp/src/tftp.h
@@ -1,3 +1,4 @@
+/* SPDX-License-Identifier: BSD-3-Clause */
 /* tftp defines */
 
 #ifndef SLIRP_TFTP_H
diff --git a/slirp/src/udp.h b/slirp/src/udp.h
index 3d29504caa..912e16705d 100644
--- a/slirp/src/udp.h
+++ b/slirp/src/udp.h
@@ -1,33 +1,7 @@
+/* SPDX-License-Identifier: BSD-3-Clause */
 /*
  * Copyright (c) 1982, 1986, 1993
- *     The Regents of the University of California.  All rights reserved.
- *
- * Redistribution and use in source and binary forms, with or without
- * modification, are permitted provided that the following conditions
- * are met:
- * 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 the University nor the names of its contributors
- *    may be used to endorse or promote products derived from this software
- *    without specific prior written permission.
- *
- * THIS SOFTWARE IS PROVIDED BY THE REGENTS 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 REGENTS 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.
- *
- *     @(#)udp.h       8.1 (Berkeley) 6/10/93
- * udp.h,v 1.3 1994/08/21 05:27:41 paul Exp
+ * The Regents of the University of California.  All rights reserved.
  */
 
 #ifndef UDP_H
diff --git a/slirp/src/util.h b/slirp/src/util.h
index e94ee4e7f1..843a0635f9 100644
--- a/slirp/src/util.h
+++ b/slirp/src/util.h
@@ -1,24 +1,7 @@
+/* SPDX-License-Identifier: BSD-3-Clause */
 /*
  * Copyright (c) 2003-2008 Fabrice Bellard
  * Copyright (c) 2010-2019 Red Hat, Inc.
- *
- * Permission is hereby granted, free of charge, to any person obtaining a copy
- * of this software and associated documentation files (the "Software"), to 
deal
- * in the Software without restriction, including without limitation the rights
- * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
- * copies of the Software, and to permit persons to whom the Software is
- * furnished to do so, subject to the following conditions:
- *
- * The above copyright notice and this permission notice shall be included in
- * all copies or substantial portions of the Software.
- *
- * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
- * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
- * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
- * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
- * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING 
FROM,
- * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
- * THE SOFTWARE.
  */
 #ifndef UTIL_H_
 #define UTIL_H_
diff --git a/slirp/src/vmstate.h b/slirp/src/vmstate.h
index cfa7b8c825..5ce06fd7b9 100644
--- a/slirp/src/vmstate.h
+++ b/slirp/src/vmstate.h
@@ -1,27 +1,10 @@
+/* SPDX-License-Identifier: BSD-3-Clause */
 /*
  * QEMU migration/snapshot declarations
  *
  * Copyright (c) 2009-2011 Red Hat, Inc.
  *
  * Original author: Juan Quintela <address@hidden>
- *
- * Permission is hereby granted, free of charge, to any person obtaining a copy
- * of this software and associated documentation files (the "Software"), to 
deal
- * in the Software without restriction, including without limitation the rights
- * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
- * copies of the Software, and to permit persons to whom the Software is
- * furnished to do so, subject to the following conditions:
- *
- * The above copyright notice and this permission notice shall be included in
- * all copies or substantial portions of the Software.
- *
- * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
- * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
- * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
- * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
- * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING 
FROM,
- * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
- * THE SOFTWARE.
  */
 #ifndef VMSTATE_H_
 #define VMSTATE_H_
diff --git a/slirp/src/arp_table.c b/slirp/src/arp_table.c
index 58eafdcfd8..d4c1d725e1 100644
--- a/slirp/src/arp_table.c
+++ b/slirp/src/arp_table.c
@@ -1,25 +1,8 @@
+/* SPDX-License-Identifier: BSD-3-Clause */
 /*
  * ARP table
  *
  * Copyright (c) 2011 AdaCore
- *
- * Permission is hereby granted, free of charge, to any person obtaining a copy
- * of this software and associated documentation files (the "Software"), to 
deal
- * in the Software without restriction, including without limitation the rights
- * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
- * copies of the Software, and to permit persons to whom the Software is
- * furnished to do so, subject to the following conditions:
- *
- * The above copyright notice and this permission notice shall be included in
- * all copies or substantial portions of the Software.
- *
- * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
- * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
- * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
- * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
- * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING 
FROM,
- * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
- * THE SOFTWARE.
  */
 
 #include "slirp.h"
diff --git a/slirp/src/bootp.c b/slirp/src/bootp.c
index d396849a05..d486110f2e 100644
--- a/slirp/src/bootp.c
+++ b/slirp/src/bootp.c
@@ -1,25 +1,8 @@
+/* SPDX-License-Identifier: BSD-3-Clause */
 /*
  * QEMU BOOTP/DHCP server
  *
  * Copyright (c) 2004 Fabrice Bellard
- *
- * Permission is hereby granted, free of charge, to any person obtaining a copy
- * of this software and associated documentation files (the "Software"), to 
deal
- * in the Software without restriction, including without limitation the rights
- * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
- * copies of the Software, and to permit persons to whom the Software is
- * furnished to do so, subject to the following conditions:
- *
- * The above copyright notice and this permission notice shall be included in
- * all copies or substantial portions of the Software.
- *
- * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
- * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
- * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
- * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
- * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING 
FROM,
- * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
- * THE SOFTWARE.
  */
 #include "slirp.h"
 
diff --git a/slirp/src/cksum.c b/slirp/src/cksum.c
index 25bfa67348..76414ea699 100644
--- a/slirp/src/cksum.c
+++ b/slirp/src/cksum.c
@@ -1,33 +1,7 @@
+/* SPDX-License-Identifier: BSD-3-Clause */
 /*
  * Copyright (c) 1988, 1992, 1993
- *     The Regents of the University of California.  All rights reserved.
- *
- * Redistribution and use in source and binary forms, with or without
- * modification, are permitted provided that the following conditions
- * are met:
- * 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 the University nor the names of its contributors
- *    may be used to endorse or promote products derived from this software
- *    without specific prior written permission.
- *
- * THIS SOFTWARE IS PROVIDED BY THE REGENTS 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 REGENTS 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.
- *
- *     @(#)in_cksum.c  8.1 (Berkeley) 6/10/93
- * in_cksum.c,v 1.2 1994/08/02 07:48:16 davidg Exp
+ * he Regents of the University of California.  All rights reserved.
  */
 
 #include "slirp.h"
diff --git a/slirp/src/dhcpv6.c b/slirp/src/dhcpv6.c
index e655c7d5b1..33cd44ad67 100644
--- a/slirp/src/dhcpv6.c
+++ b/slirp/src/dhcpv6.c
@@ -1,3 +1,4 @@
+/* SPDX-License-Identifier: BSD-3-Clause */
 /*
  * SLIRP stateless DHCPv6
  *
@@ -5,19 +6,6 @@
  * See RFC 3315, RFC 3736, RFC 3646 and RFC 5970 for details.
  *
  * Copyright 2016 Thomas Huth, Red Hat Inc.
- *
- * 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, see <http://www.gnu.org/licenses/>.
  */
 
 #include "slirp.h"
diff --git a/slirp/src/dnssearch.c b/slirp/src/dnssearch.c
index c459cece8d..5a7ab63327 100644
--- a/slirp/src/dnssearch.c
+++ b/slirp/src/dnssearch.c
@@ -1,25 +1,8 @@
+/* SPDX-License-Identifier: BSD-3-Clause */
 /*
  * Domain search option for DHCP (RFC 3397)
  *
  * Copyright (c) 2012 Klaus Stengel
- *
- * Permission is hereby granted, free of charge, to any person obtaining a copy
- * of this software and associated documentation files (the "Software"), to 
deal
- * in the Software without restriction, including without limitation the rights
- * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
- * copies of the Software, and to permit persons to whom the Software is
- * furnished to do so, subject to the following conditions:
- *
- * The above copyright notice and this permission notice shall be included in
- * all copies or substantial portions of the Software.
- *
- * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
- * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
- * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
- * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
- * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING 
FROM,
- * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
- * THE SOFTWARE.
  */
 
 #include "slirp.h"
diff --git a/slirp/src/if.c b/slirp/src/if.c
index 1830cc396c..6eaac7292a 100644
--- a/slirp/src/if.c
+++ b/slirp/src/if.c
@@ -1,8 +1,6 @@
+/* SPDX-License-Identifier: BSD-3-Clause */
 /*
  * Copyright (c) 1995 Danny Gasparovski.
- *
- * Please read the file COPYRIGHT for the
- * terms and conditions of the copyright.
  */
 
 #include "slirp.h"
diff --git a/slirp/src/ip6_icmp.c b/slirp/src/ip6_icmp.c
index c1e3d30470..5642457fdd 100644
--- a/slirp/src/ip6_icmp.c
+++ b/slirp/src/ip6_icmp.c
@@ -1,3 +1,4 @@
+/* SPDX-License-Identifier: BSD-3-Clause */
 /*
  * Copyright (c) 2013
  * Guillaume Subiron, Yann Bordenave, Serigne Modou Wagne.
diff --git a/slirp/src/ip6_input.c b/slirp/src/ip6_input.c
index 1b8c003c66..d9d2b7e9cd 100644
--- a/slirp/src/ip6_input.c
+++ b/slirp/src/ip6_input.c
@@ -1,3 +1,4 @@
+/* SPDX-License-Identifier: BSD-3-Clause */
 /*
  * Copyright (c) 2013
  * Guillaume Subiron, Yann Bordenave, Serigne Modou Wagne.
diff --git a/slirp/src/ip6_output.c b/slirp/src/ip6_output.c
index 19d1ae7748..b86110662c 100644
--- a/slirp/src/ip6_output.c
+++ b/slirp/src/ip6_output.c
@@ -1,3 +1,4 @@
+/* SPDX-License-Identifier: BSD-3-Clause */
 /*
  * Copyright (c) 2013
  * Guillaume Subiron, Yann Bordenave, Serigne Modou Wagne.
diff --git a/slirp/src/ip_icmp.c b/slirp/src/ip_icmp.c
index 120108f582..fd69e3e743 100644
--- a/slirp/src/ip_icmp.c
+++ b/slirp/src/ip_icmp.c
@@ -1,33 +1,7 @@
+/* SPDX-License-Identifier: BSD-3-Clause */
 /*
  * Copyright (c) 1982, 1986, 1988, 1993
- *     The Regents of the University of California.  All rights reserved.
- *
- * Redistribution and use in source and binary forms, with or without
- * modification, are permitted provided that the following conditions
- * are met:
- * 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 the University nor the names of its contributors
- *    may be used to endorse or promote products derived from this software
- *    without specific prior written permission.
- *
- * THIS SOFTWARE IS PROVIDED BY THE REGENTS 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 REGENTS 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.
- *
- *     @(#)ip_icmp.c   8.2 (Berkeley) 1/4/94
- * ip_icmp.c,v 1.7 1995/05/30 08:09:42 rgrimes Exp
+ * The Regents of the University of California.  All rights reserved.
  */
 
 #include "slirp.h"
diff --git a/slirp/src/ip_input.c b/slirp/src/ip_input.c
index e0b94b0e42..a31358cc16 100644
--- a/slirp/src/ip_input.c
+++ b/slirp/src/ip_input.c
@@ -1,41 +1,10 @@
+/* SPDX-License-Identifier: BSD-3-Clause */
 /*
  * Copyright (c) 1982, 1986, 1988, 1993
- *     The Regents of the University of California.  All rights reserved.
+ * The Regents of the University of California.  All rights reserved.
  *
- * Redistribution and use in source and binary forms, with or without
- * modification, are permitted provided that the following conditions
- * are met:
- * 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 the University nor the names of its contributors
- *    may be used to endorse or promote products derived from this software
- *    without specific prior written permission.
- *
- * THIS SOFTWARE IS PROVIDED BY THE REGENTS 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 REGENTS 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.
- *
- *     @(#)ip_input.c  8.2 (Berkeley) 1/4/94
- * ip_input.c,v 1.11 1994/11/16 10:17:08 jkh Exp
- */
-
-/*
  * Changes and additions relating to SLiRP are
  * Copyright (c) 1995 Danny Gasparovski.
- *
- * Please read the file COPYRIGHT for the
- * terms and conditions of the copyright.
  */
 
 #include "slirp.h"
diff --git a/slirp/src/ip_output.c b/slirp/src/ip_output.c
index f6ec141df5..9fb7124309 100644
--- a/slirp/src/ip_output.c
+++ b/slirp/src/ip_output.c
@@ -1,41 +1,10 @@
+/* SPDX-License-Identifier: BSD-3-Clause */
 /*
  * Copyright (c) 1982, 1986, 1988, 1990, 1993
- *     The Regents of the University of California.  All rights reserved.
+ * The Regents of the University of California.  All rights reserved.
  *
- * Redistribution and use in source and binary forms, with or without
- * modification, are permitted provided that the following conditions
- * are met:
- * 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 the University nor the names of its contributors
- *    may be used to endorse or promote products derived from this software
- *    without specific prior written permission.
- *
- * THIS SOFTWARE IS PROVIDED BY THE REGENTS 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 REGENTS 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.
- *
- *     @(#)ip_output.c 8.3 (Berkeley) 1/21/94
- * ip_output.c,v 1.9 1994/11/16 10:17:10 jkh Exp
- */
-
-/*
  * Changes and additions relating to SLiRP are
  * Copyright (c) 1995 Danny Gasparovski.
- *
- * Please read the file COPYRIGHT for the
- * terms and conditions of the copyright.
  */
 
 #include "slirp.h"
diff --git a/slirp/src/mbuf.c b/slirp/src/mbuf.c
index 521c02c967..800406ca9e 100644
--- a/slirp/src/mbuf.c
+++ b/slirp/src/mbuf.c
@@ -1,8 +1,6 @@
+/* SPDX-License-Identifier: BSD-3-Clause */
 /*
  * Copyright (c) 1995 Danny Gasparovski
- *
- * Please read the file COPYRIGHT for the
- * terms and conditions of the copyright.
  */
 
 /*
diff --git a/slirp/src/misc.c b/slirp/src/misc.c
index 937a418d4e..7c5db0e0aa 100644
--- a/slirp/src/misc.c
+++ b/slirp/src/misc.c
@@ -1,8 +1,6 @@
+/* SPDX-License-Identifier: BSD-3-Clause */
 /*
  * Copyright (c) 1995 Danny Gasparovski.
- *
- * Please read the file COPYRIGHT for the
- * terms and conditions of the copyright.
  */
 
 #include "slirp.h"
diff --git a/slirp/src/ncsi.c b/slirp/src/ncsi.c
index 359f52c284..8fd461381f 100644
--- a/slirp/src/ncsi.c
+++ b/slirp/src/ncsi.c
@@ -1,10 +1,8 @@
+/* SPDX-License-Identifier: BSD-3-Clause */
 /*
  * NC-SI (Network Controller Sideband Interface) "echo" model
  *
  * Copyright (C) 2016-2018 IBM Corp.
- *
- * This code is licensed under the GPL version 2 or later. See the
- * COPYING file in the top-level directory.
  */
 #include "slirp.h"
 
diff --git a/slirp/src/ndp_table.c b/slirp/src/ndp_table.c
index 34ea4fdf1f..78324877e2 100644
--- a/slirp/src/ndp_table.c
+++ b/slirp/src/ndp_table.c
@@ -1,3 +1,4 @@
+/* SPDX-License-Identifier: BSD-3-Clause */
 /*
  * Copyright (c) 2013
  * Guillaume Subiron, Yann Bordenave, Serigne Modou Wagne.
diff --git a/slirp/src/sbuf.c b/slirp/src/sbuf.c
index 51a9f0cc7d..9c0b31b513 100644
--- a/slirp/src/sbuf.c
+++ b/slirp/src/sbuf.c
@@ -1,8 +1,6 @@
+/* SPDX-License-Identifier: BSD-3-Clause */
 /*
  * Copyright (c) 1995 Danny Gasparovski.
- *
- * Please read the file COPYRIGHT for the
- * terms and conditions of the copyright.
  */
 
 #include "slirp.h"
diff --git a/slirp/src/slirp.c b/slirp/src/slirp.c
index 18af670a0a..d9ea835a13 100644
--- a/slirp/src/slirp.c
+++ b/slirp/src/slirp.c
@@ -1,25 +1,8 @@
+/* SPDX-License-Identifier: BSD-3-Clause */
 /*
  * libslirp glue
  *
  * Copyright (c) 2004-2008 Fabrice Bellard
- *
- * Permission is hereby granted, free of charge, to any person obtaining a copy
- * of this software and associated documentation files (the "Software"), to 
deal
- * in the Software without restriction, including without limitation the rights
- * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
- * copies of the Software, and to permit persons to whom the Software is
- * furnished to do so, subject to the following conditions:
- *
- * The above copyright notice and this permission notice shall be included in
- * all copies or substantial portions of the Software.
- *
- * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
- * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
- * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
- * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
- * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING 
FROM,
- * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
- * THE SOFTWARE.
  */
 #include "slirp.h"
 
diff --git a/slirp/src/socket.c b/slirp/src/socket.c
index f2428a3ae8..4a3c935e25 100644
--- a/slirp/src/socket.c
+++ b/slirp/src/socket.c
@@ -1,8 +1,6 @@
+/* SPDX-License-Identifier: BSD-3-Clause */
 /*
  * Copyright (c) 1995 Danny Gasparovski.
- *
- * Please read the file COPYRIGHT for the
- * terms and conditions of the copyright.
  */
 
 #include "slirp.h"
diff --git a/slirp/src/state.c b/slirp/src/state.c
index f5dd80cdc8..11ba93c132 100644
--- a/slirp/src/state.c
+++ b/slirp/src/state.c
@@ -1,25 +1,8 @@
+/* SPDX-License-Identifier: BSD-3-Clause */
 /*
  * libslirp
  *
  * Copyright (c) 2004-2008 Fabrice Bellard
- *
- * Permission is hereby granted, free of charge, to any person obtaining a copy
- * of this software and associated documentation files (the "Software"), to 
deal
- * in the Software without restriction, including without limitation the rights
- * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
- * copies of the Software, and to permit persons to whom the Software is
- * furnished to do so, subject to the following conditions:
- *
- * The above copyright notice and this permission notice shall be included in
- * all copies or substantial portions of the Software.
- *
- * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
- * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
- * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
- * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
- * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING 
FROM,
- * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
- * THE SOFTWARE.
  */
 #include "slirp.h"
 #include "vmstate.h"
diff --git a/slirp/src/stream.c b/slirp/src/stream.c
index d114dde334..9caf7df5ed 100644
--- a/slirp/src/stream.c
+++ b/slirp/src/stream.c
@@ -1,25 +1,8 @@
+/* SPDX-License-Identifier: BSD-3-Clause */
 /*
  * libslirp io streams
  *
  * Copyright (c) 2018 Red Hat, Inc.
- *
- * Permission is hereby granted, free of charge, to any person obtaining a copy
- * of this software and associated documentation files (the "Software"), to 
deal
- * in the Software without restriction, including without limitation the rights
- * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
- * copies of the Software, and to permit persons to whom the Software is
- * furnished to do so, subject to the following conditions:
- *
- * The above copyright notice and this permission notice shall be included in
- * all copies or substantial portions of the Software.
- *
- * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
- * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
- * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
- * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
- * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING 
FROM,
- * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
- * THE SOFTWARE.
  */
 #include "stream.h"
 #include <glib.h>
diff --git a/slirp/src/tcp_input.c b/slirp/src/tcp_input.c
index b10477fc57..2987ebd4f9 100644
--- a/slirp/src/tcp_input.c
+++ b/slirp/src/tcp_input.c
@@ -1,41 +1,12 @@
+/* SPDX-License-Identifier: BSD-3-Clause */
 /*
  * Copyright (c) 1982, 1986, 1988, 1990, 1993, 1994
- *     The Regents of the University of California.  All rights reserved.
- *
- * Redistribution and use in source and binary forms, with or without
- * modification, are permitted provided that the following conditions
- * are met:
- * 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 the University nor the names of its contributors
- *    may be used to endorse or promote products derived from this software
- *    without specific prior written permission.
- *
- * THIS SOFTWARE IS PROVIDED BY THE REGENTS 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 REGENTS 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.
- *
- *     @(#)tcp_input.c 8.5 (Berkeley) 4/10/94
- * tcp_input.c,v 1.10 1994/10/13 18:36:32 wollman Exp
+ * The Regents of the University of California.  All rights reserved.
  */
 
 /*
  * Changes and additions relating to SLiRP
  * Copyright (c) 1995 Danny Gasparovski.
- *
- * Please read the file COPYRIGHT for the
- * terms and conditions of the copyright.
  */
 
 #include "slirp.h"
diff --git a/slirp/src/tcp_output.c b/slirp/src/tcp_output.c
index e9674df121..143c4fbf85 100644
--- a/slirp/src/tcp_output.c
+++ b/slirp/src/tcp_output.c
@@ -1,41 +1,12 @@
+/* SPDX-License-Identifier: BSD-3-Clause */
 /*
  * Copyright (c) 1982, 1986, 1988, 1990, 1993
- *     The Regents of the University of California.  All rights reserved.
- *
- * Redistribution and use in source and binary forms, with or without
- * modification, are permitted provided that the following conditions
- * are met:
- * 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 the University nor the names of its contributors
- *    may be used to endorse or promote products derived from this software
- *    without specific prior written permission.
- *
- * THIS SOFTWARE IS PROVIDED BY THE REGENTS 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 REGENTS 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.
- *
- *     @(#)tcp_output.c        8.3 (Berkeley) 12/30/93
- * tcp_output.c,v 1.3 1994/09/15 10:36:55 davidg Exp
+ * The Regents of the University of California.  All rights reserved.
  */
 
 /*
  * Changes and additions relating to SLiRP
  * Copyright (c) 1995 Danny Gasparovski.
- *
- * Please read the file COPYRIGHT for the
- * terms and conditions of the copyright.
  */
 
 #include "slirp.h"
diff --git a/slirp/src/tcp_subr.c b/slirp/src/tcp_subr.c
index 1db59caa89..1c93bae6c1 100644
--- a/slirp/src/tcp_subr.c
+++ b/slirp/src/tcp_subr.c
@@ -1,41 +1,12 @@
+/* SPDX-License-Identifier: BSD-3-Clause */
 /*
  * Copyright (c) 1982, 1986, 1988, 1990, 1993
- *     The Regents of the University of California.  All rights reserved.
- *
- * Redistribution and use in source and binary forms, with or without
- * modification, are permitted provided that the following conditions
- * are met:
- * 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 the University nor the names of its contributors
- *    may be used to endorse or promote products derived from this software
- *    without specific prior written permission.
- *
- * THIS SOFTWARE IS PROVIDED BY THE REGENTS 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 REGENTS 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.
- *
- *     @(#)tcp_subr.c  8.1 (Berkeley) 6/10/93
- * tcp_subr.c,v 1.5 1994/10/08 22:39:58 phk Exp
+ * The Regents of the University of California.  All rights reserved.
  */
 
 /*
  * Changes and additions relating to SLiRP
  * Copyright (c) 1995 Danny Gasparovski.
- *
- * Please read the file COPYRIGHT for the
- * terms and conditions of the copyright.
  */
 
 #include "slirp.h"
diff --git a/slirp/src/tcp_timer.c b/slirp/src/tcp_timer.c
index 7be54570af..774737c565 100644
--- a/slirp/src/tcp_timer.c
+++ b/slirp/src/tcp_timer.c
@@ -1,33 +1,7 @@
+/* SPDX-License-Identifier: BSD-3-Clause */
 /*
  * Copyright (c) 1982, 1986, 1988, 1990, 1993
- *     The Regents of the University of California.  All rights reserved.
- *
- * Redistribution and use in source and binary forms, with or without
- * modification, are permitted provided that the following conditions
- * are met:
- * 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 the University nor the names of its contributors
- *    may be used to endorse or promote products derived from this software
- *    without specific prior written permission.
- *
- * THIS SOFTWARE IS PROVIDED BY THE REGENTS 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 REGENTS 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.
- *
- *     @(#)tcp_timer.c 8.1 (Berkeley) 6/10/93
- * tcp_timer.c,v 1.2 1994/08/02 07:49:10 davidg Exp
+ * The Regents of the University of California.  All rights reserved.
  */
 
 #include "slirp.h"
diff --git a/slirp/src/tftp.c b/slirp/src/tftp.c
index 2d8f978786..411a9f4ba4 100644
--- a/slirp/src/tftp.c
+++ b/slirp/src/tftp.c
@@ -1,25 +1,8 @@
+/* SPDX-License-Identifier: BSD-3-Clause */
 /*
  * tftp.c - a simple, read-only tftp server for qemu
  *
  * Copyright (c) 2004 Magnus Damm <address@hidden>
- *
- * Permission is hereby granted, free of charge, to any person obtaining a copy
- * of this software and associated documentation files (the "Software"), to 
deal
- * in the Software without restriction, including without limitation the rights
- * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
- * copies of the Software, and to permit persons to whom the Software is
- * furnished to do so, subject to the following conditions:
- *
- * The above copyright notice and this permission notice shall be included in
- * all copies or substantial portions of the Software.
- *
- * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
- * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
- * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
- * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
- * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING 
FROM,
- * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
- * THE SOFTWARE.
  */
 
 #include "slirp.h"
diff --git a/slirp/src/udp.c b/slirp/src/udp.c
index fa9f4a08bd..0c001757a4 100644
--- a/slirp/src/udp.c
+++ b/slirp/src/udp.c
@@ -1,41 +1,12 @@
+/* SPDX-License-Identifier: BSD-3-Clause */
 /*
  * Copyright (c) 1982, 1986, 1988, 1990, 1993
- *     The Regents of the University of California.  All rights reserved.
- *
- * Redistribution and use in source and binary forms, with or without
- * modification, are permitted provided that the following conditions
- * are met:
- * 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 the University nor the names of its contributors
- *    may be used to endorse or promote products derived from this software
- *    without specific prior written permission.
- *
- * THIS SOFTWARE IS PROVIDED BY THE REGENTS 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 REGENTS 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.
- *
- *     @(#)udp_usrreq.c        8.4 (Berkeley) 1/21/94
- * udp_usrreq.c,v 1.4 1994/10/02 17:48:45 phk Exp
+ * The Regents of the University of California.  All rights reserved.
  */
 
 /*
  * Changes and additions relating to SLiRP
  * Copyright (c) 1995 Danny Gasparovski.
- *
- * Please read the file COPYRIGHT for the
- * terms and conditions of the copyright.
  */
 
 #include "slirp.h"
diff --git a/slirp/src/udp6.c b/slirp/src/udp6.c
index be5cba1f54..bfcc7ec6fa 100644
--- a/slirp/src/udp6.c
+++ b/slirp/src/udp6.c
@@ -1,3 +1,4 @@
+/* SPDX-License-Identifier: BSD-3-Clause */
 /*
  * Copyright (c) 2013
  * Guillaume Subiron
diff --git a/slirp/src/util.c b/slirp/src/util.c
index 5ec2fa87ab..d1f7811adf 100644
--- a/slirp/src/util.c
+++ b/slirp/src/util.c
@@ -1,3 +1,4 @@
+/* SPDX-License-Identifier: BSD-3-Clause */
 /*
  * util.c (mostly based on QEMU os-win32.c)
  *
@@ -6,24 +7,6 @@
  *
  * QEMU library functions for win32 which are shared between QEMU and
  * the QEMU tools.
- *
- * Permission is hereby granted, free of charge, to any person obtaining a copy
- * of this software and associated documentation files (the "Software"), to 
deal
- * in the Software without restriction, including without limitation the rights
- * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
- * copies of the Software, and to permit persons to whom the Software is
- * furnished to do so, subject to the following conditions:
- *
- * The above copyright notice and this permission notice shall be included in
- * all copies or substantial portions of the Software.
- *
- * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
- * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
- * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
- * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
- * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING 
FROM,
- * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
- * THE SOFTWARE.
  */
 #include "util.h"
 
diff --git a/slirp/src/vmstate.c b/slirp/src/vmstate.c
index 4d08b47c61..f1c9311743 100644
--- a/slirp/src/vmstate.c
+++ b/slirp/src/vmstate.c
@@ -1,3 +1,4 @@
+/* SPDX-License-Identifier: BSD-3-Clause */
 /*
  * VMState interpreter
  *
@@ -5,9 +6,6 @@
  *
  * Authors:
  *  Juan Quintela <address@hidden>
- *
- * This work is licensed under the terms of the GNU GPL, version 2 or later.
- * See the COPYING file in the top-level directory.
  */
 #include <assert.h>
 #include <errno.h>
-- 
2.21.0.4.g36eb1cb9cf
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