BSD License：随便用，只要保留当前许可内容
BSD 2-Clause License
参见 https://opensource.org/licenses/BSD-2-Clause
BSD 2-Clause License 也叫作"Simplified BSD License" 或 "FreeBSD License"。
主要内容可以概括为
- 允许使用和重新分发软件的源码和二进制格式。
- 只要在源码里包含了当前的协议文件和内容。
- 只要在二进制格式的文档或者相关材料中包含了当前协议的内容。
BSD 2-Clause License 模板
Copyright < YEAR > < COPYRIGHT HOLDER >
Redistribution and use in source and binary forms, with or without modification, are permitted provided that the following conditions are met:
Redistributions of source code must retain the above copyright notice, this list of conditions and the following disclaimer.
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.
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 HOLDER 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.
BSD 3-Clause License
参见 https://opensource.org/licenses/BSD-3-Clause
BSD 3-Cluase 在 BSD 2-Clause 的基础上，要求当前许可文件中的作者和贡献者的名字，未经事前的书面许可，不得用于软件的推广。
