rm sphack, author-written license has nonfree restrictions

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diff --git a/Master/texmf-dist/doc/latex/sphack/sphack-doc.tex b/Master/texmf-dist/doc/latex/sphack/sphack-doc.tex
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-\documentclass[pagesize=auto]{scrartcl}
-
-\usepackage{fixltx2e}
-\usepackage{etex}
-\usepackage{lmodern}
-\usepackage[T1]{fontenc}
-\usepackage{textcomp}
-\usepackage{microtype}
-\usepackage{hyperref}
-
-\newcommand*{\mail}[1]{\href{mailto:#1}{\texttt{#1}}}
-\newcommand*{\pkg}[1]{\textsf{#1}}
-\newcommand*{\cs}[1]{\texttt{\textbackslash#1}}
-\makeatletter
-\newcommand*{\cmd}[1]{\cs{\expandafter\@gobble\string#1}}
-\makeatother
-
-\addtokomafont{title}{\rmfamily}
-
-\title{The \pkg{sphack} package\thanks{This manual corresponds to \pkg{sphack.sty}~v1.0, dated~22 May 1998.}}
-\author{Oliver Pretzel\thanks{\mail{o.pretzel@ic.ac.uk}}}
-\date{22 May 1998}
-
-
-\begin{document}
-
-\maketitle
-
-\noindent
-Standard \LaTeX\ uses the macros \cmd{\@bsphack}, \cmd{\@esphack}, and \cmd{\@Esphack}, for
-inserts into the text that should be invisible. So, for instance a space
-before and after a \cmd{\label} command should not result in two spaces in the
-output.
-
-\LaTeX\ deals with this as follows
-%
-\begin{itemize}
-\item in maths mode do nothing,
-\item in horizontal mode restore the space factor,
-\item if the last thing on the list was a space
-  add \cmd{\ignorespaces} (and (\cmd{\global})\cmd{\ignore\-true} at the end of an environment),
-\item in vertical mode do nothing.
-\end{itemize}
-
-Doing nothing in maths mode is (nearly) harmless because maths mode does its
-own spacing (and anyway hidden commands will usually appear only at the start
-or end of maths).
-
-Doing nothing in vertical mode is not harmless. Many invisible commands such
-as \cmd{\index} may insert delayed write commands into \TeX's output (so that page
-numbers are correctly calculated). These commands can cause vertical space to
-accumulate, and may cause a page break; \cmd{\index} is a particular problem in
-\LaTeX2.09 since it inserts a delayed write if an index is actually being built
-(\cmd{\makeindex} in preamble) but does nothing otherwise. That can change the page
-breaks in a document.
-
-It is not possible to solve this problem completely in \LaTeX\ because \TeX\ does
-not remove things from the main vertical list once they have been
-contributed. So \LaTeXe\ makes \cmd{\index} insert something into the vertical
-list whether the index is being written or not. That has the virtue of
-consistancy, but is far from ideal. For instance, an \cmd{\index} immediately after
-an \cmd{\item} can cause the page to break between the item label and content.
-
-\pagebreak[2]
-
-The code in the \pkg{sphack} package remedies this fault and other common anomalies so that commands
-are nearly always invisible in vertical mode as well. It works as follows:
-%
-\begin{itemize}
-\item Rename \LaTeX's dimension \cmd{\@savsk} to \cmd{\@savdim} set a new skip \cmd{\@savsk}
-  (because we need a true skip and a dimension in vertical mode)
-
-\item \cmd{\@bsphack} (at start of invisible command)
-  \begin{itemize}
-  \item in hmode (non-math)
-    \begin{enumerate}
-    \item store spacefactor in \cmd{\@savsf}
-    \item store lastskip in \cmd{\@savsk} (used to test whether space already present)
-    \end{enumerate}
-
-  \item in vmode
-    \begin{enumerate}
-    \item store lastpenalty in \cmd{\@savsf}
-    \item store lastskip in \cmd{\@savsk} (used for movement)
-    \item store previous depth  in \cmd{\@savdim}
-    \item skip back \cmd{\lastskip}
-    \end{enumerate}
-  \end{itemize}
-
-\item \cmd{\@esphack} (at end of invisible command)
-  \begin{itemize}
-  \item in hmode (non-math)
-    \begin{enumerate}
-    \item set spacefactor = \cmd{\@savsf}
-    \item if \cmd{\@savsk} > \cmd{\z@} \cmd{\ignorespaces}
-    \end{enumerate}
-
-  \item in vmode
-    \begin{enumerate}
-    \item if in a label, or just after section heading, or if \cmd{\@nobreak}\\
-      insert infinite penalty, (to prevent a page break)\\
-      else insert penalty \cmd{\@savsf}\\
-      endif
-    \item set previous depth = \cmd{\@savdim}
-    \item skip \cmd{\@savsk}
-    \end{enumerate}
-  \end{itemize}
-\end{itemize}
-%
-Just as in standard \LaTeX, \cmd{\@Esphack} is \cmd{\@esphack} + (\cmd{\global})\cmd{\@ignoretrue}.
-
-It is not necessary to change any of the label or index macros to fit with
-this code.
-
-\end{document}