之前介绍过在项目中“如何添加Apache License2.0授权证书”，可能一些小伙伴还是无感，真正在项目中使用时还是有些晕。来看个实例好了，Apache Ant很多人应该熟悉，它用的正式是Apace License 2.0开源授权证书，看看它是怎么做的呢？
一、安装包中有3个文件“LICENSE”，“NOTICE”，“README”，而且都是文本文件。
下面依次打开看一下三个文件都是什么内容。
二、LICENSE文件
LICENSE文件顾名思义，里面就是Apache Ant的授权内容，采用的是Apace License2.0+W3C授权，全文分成三部分：
1、Apache License2.0内容，License全文内容完全复制。
2、W3C授权内容，全文复制。这里解释一下，为什么要有W3C呢？W3C授权内容涵盖了软件、文档等，补充了Apace License2.0的授权内容。
3、关于Ant用到产品SAX(Simple API for XML)的版权和授权。
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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*/W3CÆ SOFTWARE NOTICE AND LICENSE
http://www.w3.org/Consortium/Legal/2002/copyright-software-20021231This work (and included software, documentation such as READMEs, or other
related items) is being provided by the copyright holders under the following
license. By obtaining, using and/or copying this work, you (the licensee) agree
that you have read, understood, and will comply with the following terms and
conditions.Permission to copy, modify, and distribute this software and its documentation,
with or without modification, for any purpose and without fee or royalty is
hereby granted, provided that you include the following on ALL copies of the
software and documentation or portions thereof, including modifications:1. The full text of this NOTICE in a location viewable to users of the
redistributed or derivative work.
2. Any pre-existing intellectual property disclaimers, notices, or terms
and conditions. If none exist, the W3C Software Short Notice should be
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of any redistributed or derivative code.
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which the code is derived.)
THIS SOFTWARE AND DOCUMENTATION IS PROVIDED "AS IS," AND COPYRIGHT HOLDERS MAKE
NO REPRESENTATIONS OR WARRANTIES, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED
TO, WARRANTIES OF MERCHANTABILITY OR FITNESS FOR ANY PARTICULAR PURPOSE OR THAT
THE USE OF THE SOFTWARE OR DOCUMENTATION WILL NOT INFRINGE ANY THIRD PARTY
PATENTS, COPYRIGHTS, TRADEMARKS OR OTHER RIGHTS.COPYRIGHT HOLDERS WILL NOT BE LIABLE FOR ANY DIRECT, INDIRECT, SPECIAL OR
CONSEQUENTIAL DAMAGES ARISING OUT OF ANY USE OF THE SOFTWARE OR DOCUMENTATION.The name and trademarks of copyright holders may NOT be used in advertising or
publicity pertaining to the software without specific, written prior permission.
Title to copyright in this software and any associated documentation will at
all times remain with copyright holders.____________________________________
This formulation of W3C's notice and license became active on December 31 2002.
This version removes the copyright ownership notice such that this license can
be used with materials other than those owned by the W3C, reflects that ERCIM
is now a host of the W3C, includes references to this specific dated version of
the license, and removes the ambiguous grant of "use". Otherwise, this version
is the same as the previous version and is written so as to preserve the Free
Software Foundation's assessment of GPL compatibility and OSI's certification
under the Open Source Definition. Please see our Copyright FAQ for common
questions about using materials from our site, including specific terms and
conditions for packages like libwww, Amaya, and Jigsaw. Other questions about
this notice can be directed to [email protected].
Joseph Reagle <[email protected]>This license came from: http://www.megginson.com/SAX/copying.html
However please note future versions of SAX may be covered
under http://saxproject.org/?selected=pdSAX2 is Free!
I hereby abandon any property rights to SAX 2.0 (the Simple API for
XML), and release all of the SAX 2.0 source code, compiled code, and
documentation contained in this distribution into the Public Domain.
SAX comes with NO WARRANTY or guarantee of fitness for any
purpose.David Megginson, [email protected]
2000-05-05
三、NOTICE文件
NOTICE文件是需要提醒用户的注意事项， 其中有版权信息。全文如下：
Apache Ant
Copyright 1999-2019 The Apache Software FoundationThis product includes software developed at
The Apache Software Foundation (http://www.apache.org/).The <sync> task is based on code Copyright (c) 2002, Landmark
Graphics Corp that has been kindly donated to the Apache Software
Foundation.
四、README文件
README文件介绍了Apache Ant软件自身，包括他是谁，有什么用，以及文档信息等等，其中有关于LICENSE的描述，用来告诉用户Apache Ant 如何获得授权。全文内容如下:
Apache Ant
What is it?
-----------
Ant is a Java based build tool. In theory it is kind of like "make"
without makes wrinkles and with the full portability of pure java code.
Why?
----
Why another build tool when there is already make, gnumake, nmake, jam,
and others? Because all of those tools have limitations that its original
author couldn't live with when developing software across multiple platforms.
Make-like tools are inherently shell based. They evaluate a set of
dependencies and then execute commands not unlike what you would issue on a
shell. This means that you can easily extend these tools by using or writing
any program for the OS that you are working on. However, this also means that
you limit yourself to the OS, or at least the OS type such as Unix, that you
are working on.
Makefiles are inherently evil as well. Anybody who has worked on them for any
time has run into the dreaded tab problem. "Is my command not executing
because I have a space in front of my tab!!!" said the original author of Ant
way too many times. Tools like Jam took care of this to a great degree, but
still use yet another format to use and remember.
Ant is different. Instead a model where it is extended with shell based
commands, it is extended using Java classes. Instead of writing shell
commands, the configuration files are XML based calling out a target tree
where various tasks get executed. Each task is run by an object which
implements a particular Task interface.
Granted, this removes some of the expressive power that is inherent by being
able to construct a shell command such as `find . -name foo -exec rm {}` but
it gives you the ability to be cross platform. To work anywhere and
everywhere. And hey, if you really need to execute a shell command, Ant has
an exec rule that allows different commands to be executed based on the OS
that it is executing on.The Latest Version
------------------Details of the latest version can be found on the Apache Ant
Project web site <http://ant.apache.org/>.
Documentation
-------------Documentation is available in HTML format, in the manual/ directory.
For information about building and installing Ant, see
manual/install.html
The manual for the latest release of Ant is available online at
<https://ant.apache.org/manual/index.html>.
The latest version of the manual is available online at
<https://rawgit.com/apache/ant/master/manual/index.html>.Licensing
---------This software is licensed under the terms you may find in the file
named "LICENSE" in this directory.
This distribution includes cryptographic software. The country in
which you currently reside may have restrictions on the import,
possession, use, and/or re-export to another country, of
encryption software. BEFORE using any encryption software, please
check your country's laws, regulations and policies concerning the
import, possession, or use, and re-export of encryption software, to
see if this is permitted. See <http://www.wassenaar.org/> for more
information.The U.S. Government Department of Commerce, Bureau of Industry and
Security (BIS), has classified this software as Export Commodity
Control Number (ECCN) 5D002.C.1, which includes information security
software using or performing cryptographic functions with asymmetric
algorithms. The form and manner of this Apache Software Foundation
distribution makes it eligible for export under the License Exception
ENC Technology Software Unrestricted (TSU) exception (see the BIS
Export Administration Regulations, Section 740.13) for both object
code and source code.The following provides more details on the included cryptographic
software:For the SSH family of tasks (<sshexec> and <scp>) Ant requires the
JSch <http://www.jcraft.com/jsch/index.html> library as well as the
Java Cryptography extensions
<http://java.sun.com/javase/technologies/security/>. Ant does not
include these libraries itself, but is designed to use them.Thanks for using Ant.
The Apache Ant Project
<http://ant.apache.org/>
总结
- 安装包备齐三个文件：LICENSE+NOTICE+README
- LICENSE负责具体授权内容
- NOTICE负责声明版权归属
- README负责导航说明如何获得授权
