diff --git a/CMakeLists.txt b/CMakeLists.txt
index d6d954f..52b2074 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -2,7 +2,8 @@
#
# https://github.com/martinmoene/optional-lite
#
-# This code is licensed under the MIT License (MIT).
+# Distributed under the Boost Software License, Version 1.0.
+# (See accompanying file LICENSE.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
cmake_minimum_required( VERSION 2.8.12 )
diff --git a/LICENSE b/LICENSE
deleted file mode 100644
index a0b19ce..0000000
--- a/LICENSE
+++ /dev/null
@@ -1,21 +0,0 @@
-MIT License
-
-Copyright (c) 2016 Martin Moene
-
-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.
diff --git a/LICENSE.txt b/LICENSE.txt
new file mode 100644
index 0000000..36b7cd9
--- /dev/null
+++ b/LICENSE.txt
@@ -0,0 +1,23 @@
+Boost Software License - Version 1.0 - August 17th, 2003
+
+Permission is hereby granted, free of charge, to any person or organization
+obtaining a copy of the software and accompanying documentation covered by
+this license (the "Software") to use, reproduce, display, distribute,
+execute, and transmit the Software, and to prepare derivative works of the
+Software, and to permit third-parties to whom the Software is furnished to
+do so, all subject to the following:
+
+The copyright notices in the Software and this entire statement, including
+the above license grant, this restriction and the following disclaimer,
+must be included in all copies of the Software, in whole or in part, and
+all derivative works of the Software, unless such copies or derivative
+works are solely in the form of machine-executable object code generated by
+a source language processor.
+
+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, TITLE AND NON-INFRINGEMENT. IN NO EVENT
+SHALL THE COPYRIGHT HOLDERS OR ANYONE DISTRIBUTING THE SOFTWARE BE LIABLE
+FOR ANY DAMAGES OR OTHER LIABILITY, WHETHER IN CONTRACT, TORT OR OTHERWISE,
+ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
+DEALINGS IN THE SOFTWARE.
diff --git a/README.md b/README.md
index 3f59c2b..ea93659 100644
--- a/README.md
+++ b/README.md
@@ -1,6 +1,6 @@
optional lite - A single-file header-only version of a C++17-like optional, a nullable object for C++98, C++11 and later
====================================================
-[![Language](https://img.shields.io/badge/language-C++-blue.svg)](https://isocpp.org/) [![Standard](https://img.shields.io/badge/c%2B%2B-98/11-blue.svg)](https://en.wikipedia.org/wiki/C%2B%2B#Standardization) [![License](https://img.shields.io/badge/license-MIT-blue.svg)](https://opensource.org/licenses/MIT) [![Build Status](https://travis-ci.org/martinmoene/optional-lite.svg?branch=master)](https://travis-ci.org/martinmoene/optional-lite) [![Build status](https://ci.appveyor.com/api/projects/status/1oq5gjm7bufrv6ib?svg=true)](https://ci.appveyor.com/project/martinmoene/optional-lite) [![Version](https://badge.fury.io/gh/martinmoene%2Foptional-lite.svg)](https://github.com/martinmoene/optional-lite/releases) [![download](https://img.shields.io/badge/latest-download-blue.svg)](https://raw.githubusercontent.com/martinmoene/optional-lite/master/include/nonstd/optional.hpp) [![Conan](https://img.shields.io/badge/conan-download-blue.svg)](https://bintray.com/agauniyal/nonstd-lite/optional-lite%3Anonstd-lite/_latestVersion) [![Try it online](https://img.shields.io/badge/try%20it-online-blue.svg)](https://wandbox.org/permlink/DMZg1wOekSwEb54i)
+[![Language](https://img.shields.io/badge/language-C++-blue.svg)](https://isocpp.org/) [![Standard](https://img.shields.io/badge/c%2B%2B-98/11-blue.svg)](https://en.wikipedia.org/wiki/C%2B%2B#Standardization) [![License](https://img.shields.io/badge/license-BSL-blue.svg)](https://opensource.org/licenses/BSL-1.0) [![Build Status](https://travis-ci.org/martinmoene/optional-lite.svg?branch=master)](https://travis-ci.org/martinmoene/optional-lite) [![Build status](https://ci.appveyor.com/api/projects/status/1oq5gjm7bufrv6ib?svg=true)](https://ci.appveyor.com/project/martinmoene/optional-lite) [![Version](https://badge.fury.io/gh/martinmoene%2Foptional-lite.svg)](https://github.com/martinmoene/optional-lite/releases) [![download](https://img.shields.io/badge/latest-download-blue.svg)](https://raw.githubusercontent.com/martinmoene/optional-lite/master/include/nonstd/optional.hpp) [![Conan](https://img.shields.io/badge/conan-download-blue.svg)](https://bintray.com/agauniyal/nonstd-lite/optional-lite%3Anonstd-lite/_latestVersion) [![Try it online](https://img.shields.io/badge/try%20it-online-blue.svg)](https://wandbox.org/permlink/VDDmoof3jokMLsBd)
**Contents**
- [Example usage](#example-usage)
@@ -67,7 +67,7 @@ For more examples, see [this answer on StackOverflow](http://stackoverflow.com/a
License
-------
-*optional lite* uses the [MIT](LICENSE) license.
+*optional lite* is distributed under the [Boost Software License](LICENSE.txt).
Dependencies
diff --git a/include/nonstd/optional.hpp b/include/nonstd/optional.hpp
index 8a4a31a..3b773d8 100644
--- a/include/nonstd/optional.hpp
+++ b/include/nonstd/optional.hpp
@@ -1,24 +1,17 @@
//
-// Copyright (c) 2014-2017 Martin Moene
+// Copyright (c) 2014-2018 Martin Moene
//
// https://github.com/martinmoene/optional-lite
//
-// This code is licensed under the MIT License (MIT).
-//
-// 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.
+// Distributed under the Boost Software License, Version 1.0.
+// (See accompanying file LICENSE.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
#pragma once
#ifndef NONSTD_OPTIONAL_LITE_HPP
#define NONSTD_OPTIONAL_LITE_HPP
-#define optional_lite_VERSION "2.3.2"
+#define optional_lite_VERSION "3.0.0"
// Compiler detection (C++20 is speculative):
// Note: MSVC supports C++14 since it supports C++17.
diff --git a/project/CodeBlocks/optional-lite.cbp b/project/CodeBlocks/optional-lite.cbp
index af2ed45..039354b 100644
--- a/project/CodeBlocks/optional-lite.cbp
+++ b/project/CodeBlocks/optional-lite.cbp
@@ -16,7 +16,7 @@
-
+
diff --git a/test/CMakeLists.txt b/test/CMakeLists.txt
index fc64cb6..85d6ce1 100644
--- a/test/CMakeLists.txt
+++ b/test/CMakeLists.txt
@@ -2,7 +2,8 @@
#
# https://github.com/martinmoene/optional-lite
#
-# This code is licensed under the MIT License (MIT).
+# Distributed under the Boost Software License, Version 1.0.
+# (See accompanying file LICENSE.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
cmake_minimum_required( VERSION 3.0 )
diff --git a/test/optional-main.t.cpp b/test/optional-main.t.cpp
index d03d15b..0840de7 100644
--- a/test/optional-main.t.cpp
+++ b/test/optional-main.t.cpp
@@ -2,7 +2,8 @@
//
// https://github.com/martinmoene/optional-lite
//
-// This code is licensed under the MIT License (MIT).
+// Distributed under the Boost Software License, Version 1.0.
+// (See accompanying file LICENSE.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
#include "optional-main.t.h"
diff --git a/test/optional-main.t.h b/test/optional-main.t.h
index 314a14a..b750b83 100644
--- a/test/optional-main.t.h
+++ b/test/optional-main.t.h
@@ -2,7 +2,8 @@
//
// https://github.com/martinmoene/optional-lite
//
-// This code is licensed under the MIT License (MIT).
+// Distributed under the Boost Software License, Version 1.0.
+// (See accompanying file LICENSE.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
#pragma once
diff --git a/test/optional.t.cpp b/test/optional.t.cpp
index 1be1bd9..23dd1b8 100644
--- a/test/optional.t.cpp
+++ b/test/optional.t.cpp
@@ -1,5 +1,5 @@
//
-// Copyright 2014-2017 by Martin Moene
+// Copyright 2014-2018 by Martin Moene
//
// Distributed under the Boost Software License, Version 1.0. (See accompanying
// file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)