修改和使用第三方开源软件后重新发布开源License怎么写，看看Apache Maven就明白了

有人说，看了很多开源License的文章，我还是不知道如果修改了或者引用了他人发布的开源软件，然后重新发布自己的修改版本，该怎么做？如何加上自己的著作权同时又尊重原来的作者。其实就差一个例子，看看Apache Maven就明白了。

一、安装包中包含LICENSE、NOTICE、README三个文本文件

打开Apache Maven一目了然，里面包含三个文件“LICENSE、NOTICE、README”且都是文本文件，如下图所示：

很多程序员写项目都会忽略写文档，一个完整的项目建议包含这三个文件，既能提升档次，又能给用户帮助。这三个文件合成一个行不行呢？也可以，其实没有严格的规定，但是建议分开，这三个文件各有侧重，而且很多大型的开源项目都是必备这三个文件，建议向大佬看齐。下面依次打开这三个文件，看看全文、

二、LICENSE文件及内容

打开Apache Maven中的LICENSE文件可以看到主要分成两大部分：
第一部分：Apache LICENSE2.0的内容，也是Apache Maven自身的授权条款。

第二部分：Apache Maven中用到的第三方组件和它的License。如果没有用到第三方开源项目或者第三方开源项目与Maven授权一样，那么这一部分可以不写，但是版权中必须声明第三方项目所属的版权（可在NOTICE中统一声明）。同理，如果当前项目是一个衍生产品，即基于他人的作品修改后的发布，那么也是采用同样的处理方式。
Apache Maven的License全文内容如下：

                                Apache License
                           Version 2.0, January 2004
                        http://www.apache.org/licenses/

TERMS AND CONDITIONS FOR USE, REPRODUCTION, AND DISTRIBUTION

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Apache Maven includes a number of components and libraries with separate
copyright notices and license terms. Your use of those components are
subject to the terms and conditions of the following licenses:

- lib/guava-25.1-android.jar: com.google.guava:guava:bundle:25.1-android
Guava: Google Core Libraries for Java
Project URL: https://github.com/google/guava/
License: The Apache Software License, Version 2.0 (ASL-2.0) http://www.apache.org/licenses/LICENSE-2.0.txt (lib/guava.license)

- lib/guice-4.2.1.jar: com.google.inject:guice:jar:4.2.1
Google Guice - Core Library
Project URL: https://github.com/google/guice/
License: The Apache Software License, Version 2.0 (ASL-2.0) http://www.apache.org/licenses/LICENSE-2.0.txt (lib/guice.license)

- lib/commons-cli-1.4.jar: commons-cli:commons-cli:jar:1.4
Apache Commons CLI
Project URL: http://commons.apache.org/proper/commons-cli/
License: Apache License, Version 2.0 (ASL-2.0) https://www.apache.org/licenses/LICENSE-2.0.txt (lib/commons-cli.license)

- lib/commons-io-2.5.jar: commons-io:commons-io:jar:2.5
Apache Commons IO
Project URL: http://commons.apache.org/proper/commons-io/
License: Apache License, Version 2.0 (ASL-2.0) http://www.apache.org/licenses/LICENSE-2.0.txt (lib/commons-io.license)

- lib/jsr250-api-1.0.jar: javax.annotation:jsr250-api:jar:1.0
JSR-250 Common Annotations for the JavaTM Platform
Project URL: http://jcp.org/aboutJava/communityprocess/final/jsr250/index.html
License: COMMON DEVELOPMENT AND DISTRIBUTION LICENSE (CDDL) Version 1.0 (CDDL-1.0) https://glassfish.dev.java.net/public/CDDLv1.0.html (lib/jsr250-api.license)

- lib/cdi-api-1.0.jar: javax.enterprise:cdi-api:jar:1.0
CDI APIs
Project URL: http://www.seamframework.org/Weld/cdi-api
License: Apache License, Version 2.0 (ASL-2.0) http://www.apache.org/licenses/LICENSE-2.0 (lib/cdi-api.license)

- lib/javax.inject-1.jar: javax.inject:javax.inject:jar:1
javax.inject
Project URL: http://code.google.com/p/atinject/
License: The Apache Software License, Version 2.0 (ASL-2.0) http://www.apache.org/licenses/LICENSE-2.0.txt (lib/javax.inject.license)

- lib/commons-lang3-3.8.1.jar: org.apache.commons:commons-lang3:jar:3.8.1
Apache Commons Lang
Project URL: http://commons.apache.org/proper/commons-lang/
License: Apache License, Version 2.0 (ASL-2.0) https://www.apache.org/licenses/LICENSE-2.0.txt (lib/commons-lang3.license)

- boot/plexus-classworlds-2.6.0.jar: org.codehaus.plexus:plexus-classworlds:bundle:2.6.0
Plexus Classworlds
Project URL: http://codehaus-plexus.github.io/plexus-classworlds/
License: Apache License, Version 2.0 (ASL-2.0) http://www.apache.org/licenses/LICENSE-2.0.txt (boot/plexus-classworlds.license)

- lib/plexus-component-annotations-2.1.0.jar: org.codehaus.plexus:plexus-component-annotations:jar:2.1.0
Plexus :: Component Annotations
Project URL: http://codehaus-plexus.github.io/plexus-containers/plexus-component-annotations/
License: Apache License, Version 2.0 (ASL-2.0) http://www.apache.org/licenses/LICENSE-2.0.txt (lib/plexus-component-annotations.license)

- lib/plexus-interpolation-1.25.jar: org.codehaus.plexus:plexus-interpolation:bundle:1.25
Plexus Interpolation API
Project URL: http://codehaus-plexus.github.io/plexus-interpolation/
License: Apache License, Version 2.0 (ASL-2.0) http://www.apache.org/licenses/LICENSE-2.0.txt (lib/plexus-interpolation.license)

- lib/plexus-utils-3.2.1.jar: org.codehaus.plexus:plexus-utils:jar:3.2.1
Plexus Common Utilities
Project URL: http://codehaus-plexus.github.io/plexus-utils/
License: Apache License, Version 2.0 (ASL-2.0) http://www.apache.org/licenses/LICENSE-2.0.txt (lib/plexus-utils.license)

- lib/org.eclipse.sisu.inject-0.3.4.jar: org.eclipse.sisu:org.eclipse.sisu.inject:jar:0.3.4
org.eclipse.sisu.inject
Project URL: https://www.eclipse.org/sisu/
License: Eclipse Public License, Version 1.0 (EPL-1.0) http://www.eclipse.org/legal/epl-v10.html (lib/org.eclipse.sisu.inject.license)

- lib/org.eclipse.sisu.plexus-0.3.4.jar: org.eclipse.sisu:org.eclipse.sisu.plexus:jar:0.3.4
org.eclipse.sisu.plexus
Project URL: https://www.eclipse.org/sisu/
License: Eclipse Public License, Version 1.0 (EPL-1.0) http://www.eclipse.org/legal/epl-v10.html (lib/org.eclipse.sisu.plexus.license)

- lib/jansi-1.17.1.jar: org.fusesource.jansi:jansi:jar:1.17.1
jansi
Project URL: http://fusesource.github.io/jansi/jansi
License: The Apache Software License, Version 2.0 (ASL-2.0) http://www.apache.org/licenses/LICENSE-2.0.txt (lib/jansi.license)

- lib/jsoup-1.12.1.jar: org.jsoup:jsoup:jar:1.12.1
jsoup Java HTML Parser
Project URL: https://jsoup.org/
License: The MIT License (MIT) https://jsoup.org/license (lib/jsoup.license)

- lib/jcl-over-slf4j-1.7.29.jar: org.slf4j:jcl-over-slf4j:jar:1.7.29
JCL 1.2 implemented over SLF4J
Project URL: http://www.slf4j.org
License: Apache License, Version 2.0 (ASL-2.0) https://www.apache.org/licenses/LICENSE-2.0.txt (lib/jcl-over-slf4j.license)

- lib/slf4j-api-1.7.29.jar: org.slf4j:slf4j-api:jar:1.7.29
SLF4J API Module
Project URL: http://www.slf4j.org
License: MIT License (MIT) http://www.opensource.org/licenses/mit-license.php (lib/slf4j-api.license)

- lib/plexus-cipher-1.7.jar: org.sonatype.plexus:plexus-cipher:jar:1.7
Plexus Cipher: encryption/decryption Component
Project URL: http://spice.sonatype.org/plexus-cipher
License: Apache Public License 2.0 (ASL-2.0) http://www.apache.org/licenses/LICENSE-2.0 (lib/plexus-cipher.license)

- lib/plexus-sec-dispatcher-1.4.jar: org.sonatype.plexus:plexus-sec-dispatcher:jar:1.4
Plexus Security Dispatcher Component
Project URL: http://spice.sonatype.org/plexus-sec-dispatcher
License: Apache Public License 2.0 (ASL-2.0) http://www.apache.org/licenses/LICENSE-2.0 (lib/plexus-sec-dispatcher.license)

三、NOTICE文件

NOTICE文件主要声明了Apache Maven的版权信息，以及它引用的第三方组件的版权信息。全文内容如下：

Apache Maven Distribution
Copyright 2001-2019 The Apache Software Foundation

This product includes software developed at
The Apache Software Foundation (http://www.apache.org/).

This software bundles the following NOTICE files from third party library providers:

META-INF/NOTICE in archive lib/guice-4.2.1-no_aop.jar
Google Guice - Core Library
Copyright 2006-2018 Google, Inc.
This product includes software developed at
The Apache Software Foundation (http://www.apache.org/).

META-INF/NOTICE in archive lib/plexus-utils-3.2.1.jar
This product includes software developed by the Indiana University
Extreme! Lab (http://www.extreme.indiana.edu/).
This product includes software developed by
The Apache Software Foundation (http://www.apache.org/).
This product includes software developed by
ThoughtWorks (http://www.thoughtworks.com).
This product includes software developed by
javolution (http://javolution.org/).
This product includes software developed by
Rome (https://rome.dev.java.net/).

about.html in archive lib/org.eclipse.sisu.inject-0.3.4.jar

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN"
"http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1"/>
<title>About org.eclipse.sisu.inject</title>
</head>
<body lang="EN-US">
<h2>About org.eclipse.sisu.inject</h2>

<p>November 5, 2013</p>
<h3>License</h3>

<p>The Eclipse Foundation makes available all content in this plug-in ("Content"). Unless otherwise
indicated below, the Content is provided to you under the terms and conditions of the
Eclipse Public License Version 1.0 ("EPL"). A copy of the EPL is available
at <a href="http://www.eclipse.org/legal/epl-v10.html">http://www.eclipse.org/legal/epl-v10.html</a>.
For purposes of the EPL, "Program" will mean the Content.</p>

<p>If you did not receive this Content directly from the Eclipse Foundation, the Content is
being redistributed by another party ("Redistributor") and different terms and conditions may
apply to your use of any object code in the Content. Check the Redistributor's license that was
provided with the Content. If no such license exists, contact the Redistributor. Unless otherwise
indicated below, the terms and conditions of the EPL still apply to any source code in the Content
and such source code may be obtained at <a href="http://www.eclipse.org/">http://www.eclipse.org</a>.</p>

<h3>Third Party Content</h3>
<p>The Content includes items that have been sourced from third parties as set
out below. If you did not receive this Content directly from the Eclipse Foundation,
the following is provided for informational purposes only, and you should look
to the Redistributor's license for terms and conditions of use.</p>

<h4>ASM 4.1</h4>
<p>The plug-in includes software developed by the ObjectWeb consortium as part
of the ASM project at <a href="http://asm.ow2.org/">http://asm.ow2.org/</a>.</p>

<p>A subset of ASM is re-packaged within the source and binary of the plug-in (org.eclipse.sisu.space.asm.*)
to avoid version collisions with other usage and is also available from the plug-in's github repository.</p>

<p>Your use of the ASM code is subject to the terms and conditions of the ASM License
below which is also available at <a href="http://asm.ow2.org/license.html">http://asm.ow2.org/license.html</a>.</p>

<blockquote><pre>
Copyright (c) 2000-2011 INRIA, France Telecom
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 copyright holders 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 COPYRIGHT HOLDERS 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 COPYRIGHT OWNER 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.
</pre></blockquote>

</body>
</html>

四、README文件

README文件向用户介绍了Apache Maven产品本身，包括如何使用，如何查看和获得授权等提示信息。全文内容如下：

Apache Maven

What is it?
-----------

Maven is a software project management and comprehension tool. Based on
the concept of a Project Object Model (POM), Maven can manage a project's
build, reporting and documentation from a central piece of information.

Documentation
-------------

The most up-to-date documentation can be found at https://maven.apache.org/.

Release Notes
-------------

The full list of changes can be found at https://maven.apache.org/docs/history.html.

System Requirements
-------------------

JDK:
1.7 or above (this is to execute Maven - it still allows you to build against 1.3
and prior JDK's).
Memory:
No minimum requirement.
Disk:
Approximately 10MB is required for the Maven installation itself. In addition to
that, additional disk space will be used for your local Maven repository. The size
of your local repository will vary depending on usage but expect at least 500MB.
Operating System:
Windows:
Windows 2000 or above.
Unix based systems (Linux, Solaris and Mac OS X) and others:
No minimum requirement.

Installing Maven
----------------

1) Unpack the archive where you would like to store the binaries, e.g.:

Unix-based operating systems (Linux, Solaris and Mac OS X)
tar zxvf apache-maven-3.x.y.tar.gz
Windows
unzip apache-maven-3.x.y.zip

2) A directory called "apache-maven-3.x.y" will be created.

3) Add the bin directory to your PATH, e.g.:

Unix-based operating systems (Linux, Solaris and Mac OS X)
export PATH=/usr/local/apache-maven-3.x.y/bin:$PATH
Windows
set PATH="c:\program files\apache-maven-3.x.y\bin";%PATH%

4) Make sure JAVA_HOME is set to the location of your JDK

5) Run "mvn --version" to verify that it is correctly installed.

For complete documentation, see https://maven.apache.org/download.html#Installation

Licensing
---------

Please see the file called LICENSE.

Maven URLS
----------

Home Page: https://maven.apache.org/
Downloads: https://maven.apache.org/download.html
Release Notes: https://maven.apache.org/docs/history.html
Mailing Lists: https://maven.apache.org/mailing-lists.html
Source Code: https://gitbox.apache.org/repos/asf/maven.git
Issue Tracking: https://issues.apache.org/jira/browse/MNG
Wiki: https://cwiki.apache.org/confluence/display/MAVEN/
Available Plugins: https://maven.apache.org/plugins/

总结

修改源码重新发布或引用第三方开源组件发布，应当这么做：

安装包备齐三个文件：LICENSE+NOTICE+README

LICENSE列明授权：自己的授权和第三方授权分别列明，授权相同无需重复罗列。

NOTICE声明版权：声明自己版权+他人版权

README：告知如何查看授权信息。

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