Beginnings of chapter on GPLv3.

gpl-lgpl.tex

@@ -2140,8 +2140,40 @@ So end the terms and conditions of the GNU General Public License.
 \chapter{GPLv3}
 \label{GPLv3}
 
+This chapter discussed the text of GPLv3.  Much of this material herein
+includes text that was adapted (with permission) from text that FSF
+originally published as part of the so-called ``rationale documents'' for the
+various discussion drafts of GPLv3.
+
+The FSF ran a somewhat public process to develop GPLv3, and it was the first
+attempt of its kind to develop a Free Software license this way.  Ultimately,
+RMS was the primary author of GPLv3, but he listened to feedback from all
+sorts of individuals and even for-profit companies.  Nevertheless, in
+attempting to understand GPLv3 after the fact, the materials available from
+the GPLv3 process have a somewhat ``drinking from the firehose'' effect.
+This chapter seeks to explain GPLv3 to newcomers, who perhaps are familiar
+with GPLv2.
+
 \section{Understanding GPLv3 As An Upgraded GPLv2}
 
+Ultimately, GPLv2 and GPLv3 co-exist as active licenses in regular use.  As
+discussed in Chapter\~ref{tale-of-two-copylefts}, GPLv1 was never in regular
+use alongside GPLv2.  However, given GPLv2's widespread popularity and
+existing longevity by the time GPLv3 was published, it is not surprising that
+some licensors have continued to prefer GPLv2-only or GPLv2-or-later as their
+preferred license.  GPLv3 has gained major adoption by many projects, old and
+new, but many projects have not upgraded due to (in some cases) mere laziness
+and (in other cases) policy preference for some of GPLv2's terms.
+
+Given this ``two GPLs'' world is the one we all live in, it makes sense to
+consider GPLv3 in terms of how it differs from GPLv2.  Also, most of the best
+GPL experts in the world must deal regularly with both licenses, and
+admittedly have decades of experience of GPLv2 while the most experience with
+GPLv3 that's possible is by default less than a decade.
+
+These two factors usually cause even new students of GPL to start with GPLv2
+and move on to GPLv3, and this tutorial follows that pattern.
+
 \section{GPLv3~\S0: Giving In On ``Defined Terms''}
 
 \section{GPLv3~\S1: Understanding CCS}