Rework introduction to this section.

gpl-lgpl.tex

@@ -523,9 +523,25 @@ such as the right of an authors to require proper attribution for their work.
 
 \section{A Community of Equality}
 
-The GPL uses copyright law to defend freedom and equally ensure users'
-rights. This ultimately creates an community of equality for both
-business and noncommercial users.
+The previous section described the principles of software freedom, a brief
+introduction to mechanisms that typically block these freedoms, and the
+simplest ways that copyright holders might grant those freedoms to their
+users for their copyrighted works of software.  The previous section also
+introduced the idea of \textit{copyleft}: a licensing mechanism to use
+copyright to not only grant software freedom to users, but also to uphold
+those rights against those who might seek to curtail them.
+
+Copyleft, as defined in \S~\ref{copyleft-definition}, is a general term this
+mechanism.  The remainder of this text will discuss details of various
+real-world implementations of copyleft -- most notably, the GPL\@.
+
+This discussion begins first with some general explanation of what the GPL is
+able to do in software development communities.  After that brief discussion
+in this section, deeper discussion of how GPL accomplishes this in practice
+follows in the next chapter.
+
+Simply put, though, the GPL ultimately creates an community of equality for
+both business and noncommercial users.
 
 \subsection{The Noncommercial Community}