@@ -1104,24 +1104,25 @@ warranty disclaimers.)
Note finally that GPLv2~\S1 creates groundwork for the important defense of
commercial freedom. GPLv2~\S1 clearly states that in the case of verbatim
copies, one may make money. Re distributors are fully permitted to charge
for the redistribution of copies of Free Software. In addition, they may
provide the warranty protection that the GPL disclaims as an additional
service for a fee. (See Section~\ref{Business Models} for more discussion
on making a profit from Free Software redistribution.)
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\chapter{Derivative Works: Statute and Case Law}
\label{derivative-works}
We digress for this chapter from our discussion of GPL's exact text to
consider the matter of derivative works --- a concept that we must
understand fully before considering GPLv2~\S\S2--3\@. GPL, and Free
Software licensing in general, relies critically on the concept of
``derivative work'' since software that is ``independent,'' (i.e., not
``derivative'') of Free Software need not abide by the terms of the
applicable Free Software license. As much is required by \S~106 of the
Copyright Act, 17 U.S.C. \S~106 (2002), and admitted by Free Software
licenses, such as the GPL, which (as we have seen) states in GPLv2~\S0 that ``a
`work based on the Program' means either the Program or any derivative
work under copyright law.'' It is being a derivative work of Free Software