七种开源许可证 - 知乎 (zhihu.com)， ISC许可证是一种开放源代码许可证，在功能上与两句版的BSD许可证相同
早上看上面文档，两句版BSD？查了一下：
FreeBSD和Linux有什么不同? - evilqliang - 博客园 (cnblogs.com)
BSD 许可证与 GPL 许可证相比，相当简短，最初只有四句规则；
1999年应 RMS 请求，删除了第三句，新的许可证称作“新 BSD”或三句版BSD；
原来的 BSD 许可证称作“旧 BSD”、“修订的 BSD”或四句版BSD；
也有一种删除了第三、第四两句的版本，称之为两句版 BSD，等价于 MIT 许可证。
- 4句版：License:BSD-4-Clause - Free Software Directory (fsf.org)
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Redistributions of source code must retain the above copyright notice, this list of conditions and the following disclaimer.
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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.
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All advertising materials mentioning features or use of this software must display the following acknowledgement: This product includes software developed by the University of California, Berkeley and its contributors.
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Neither the name of the University nor the names of its contributors may be used to endorse or promote products derived from this software without specific prior written permission.
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- 3句版：The 3-Clause BSD License or License:BSD-3-Clause - Free Software Directory (fsf.org)
(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)The name of the author may not be used to endorse or promote products derived from this software without specific prior written permission.
- 2句版：The 2-Clause BSD License （等于 "FreeBSD" license，等于 ISC license ）or License:BSD-2-Clause - Free Software Directory (fsf.org)
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. - 1句版：1-clause BSD License (BSD-1-Clause) | Open Source Initiative or License:BSD-1-Clause - Free Software Directory (fsf.org)
- 0句版：Zero-Clause BSD (0BSD) | Open Source Initiative
original BSD license、FreeBSD license、Original BSD license
参考：BSD License - Catalinas - 博客园 (cnblogs.com)
