Permission is granted to anyone to use this software for any purpose
on any computer system, and to alter it and redistribute it, subject
to the following restrictions:
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1. The author is not responsible for the consequences of use of this
   software, no matter how awful, even if they arise from flaws in it.
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2. The origin of this software must not be misrepresented, either by
   explicit claim or by omission.  Since few users ever read sources,
   credits must appear in the documentation.
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3. Altered versions must be plainly marked as such, and must not be
   misrepresented as being the original software.  Since few users
   ever read sources, credits must appear in the documentation.
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4. This notice may not be removed or altered.