diff --git a/LICENSES/LicenseRef-SHA1-Public-Domain.txt b/LICENSES/LicenseRef-SHA1-Public-Domain.txt
new file mode 100644
index 0000000000..2ebbf9a78a
--- /dev/null
+++ b/LICENSES/LicenseRef-SHA1-Public-Domain.txt
@@ -0,0 +1,3 @@
+100% free public domain implementation of the SHA-1 algorithm
+by Dominik Reichl <dominik.reichl@t-online.de>
+Web: http://www.dominik-reichl.de/
diff --git a/src/3rdparty/sha1/qt_attribution.json b/src/3rdparty/sha1/qt_attribution.json
index 8aaf5f08cb..4a61602bde 100644
--- a/src/3rdparty/sha1/qt_attribution.json
+++ b/src/3rdparty/sha1/qt_attribution.json
@@ -7,7 +7,7 @@
     "Description": "Implements the Secure Hash Algorithms SHA 1",
     "Homepage": "http://www.dominik-reichl.de/projects/csha1/",
     "License": "Public Domain",
-    "LicenseId": "CC0-1.0",
+    "LicenseId": "LicenseRef-SHA1-Public-Domain",
     "Copyright": "Copyright (C) Dominik Reichl <dominik.reichl@t-online.de>
 Copyright (C) 2016 The Qt Company Ltd"
 }
diff --git a/src/3rdparty/sha1/sha1.cpp b/src/3rdparty/sha1/sha1.cpp
index c42819def5..6dd25e3c15 100644
--- a/src/3rdparty/sha1/sha1.cpp
+++ b/src/3rdparty/sha1/sha1.cpp
@@ -1,46 +1,10 @@
-/****************************************************************************
-**
-** Copyright (C) 2016 The Qt Company Ltd.
-** Contact: https://www.qt.io/licensing/
-**
-** This file is part of the Qt Toolkit.
-**
-** $QT_BEGIN_LICENSE:LGPL$
-** Commercial License Usage
-** Licensees holding valid commercial Qt licenses may use this file in
-** accordance with the commercial license agreement provided with the
-** Software or, alternatively, in accordance with the terms contained in
-** a written agreement between you and The Qt Company. For licensing terms
-** and conditions see https://www.qt.io/terms-conditions. For further
-** information use the contact form at https://www.qt.io/contact-us.
-**
-** GNU Lesser General Public License Usage
-** Alternatively, this file may be used under the terms of the GNU Lesser
-** General Public License version 3 as published by the Free Software
-** Foundation and appearing in the file LICENSE.LGPL3 included in the
-** packaging of this file. Please review the following information to
-** ensure the GNU Lesser General Public License version 3 requirements
-** will be met: https://www.gnu.org/licenses/lgpl-3.0.html.
-**
-** GNU General Public License Usage
-** Alternatively, this file may be used under the terms of the GNU
-** General Public License version 2.0 or (at your option) the GNU General
-** Public license version 3 or any later version approved by the KDE Free
-** Qt Foundation. The licenses are as published by the Free Software
-** Foundation and appearing in the file LICENSE.GPL2 and LICENSE.GPL3
-** included in the packaging of this file. Please review the following
-** information to ensure the GNU General Public License requirements will
-** be met: https://www.gnu.org/licenses/gpl-2.0.html and
-** https://www.gnu.org/licenses/gpl-3.0.html.
-**
-** $QT_END_LICENSE$
-**
-****************************************************************************/
+// Based on the public domain implementation of the SHA-1 algorithm by Dominik Reichl
+//
+// Copyright (C) Dominik Reichl <dominik.reichl@t-online.de>
+// Copyright (C) 2016 The Qt Company Ltd.
+//
+// SPDX-License-Identifier: LicenseRef-SHA1-Public-Domain
 
-/*
-  Based on the public domain implementation of the SHA-1 algorithm
-  Copyright (C) Dominik Reichl <dominik.reichl@t-online.de>
-*/
 #include <QtCore/qendian.h>
 
 #ifdef Q_CC_MSVC