\label{Free Software Definition}

The Free Software Definition is set forth in full on FSF's website at

A particular program is Free Software if it grants a particular user of

that program, the following freedoms:

it Free Software\footnote{The political differences between the Free

Software Movement and the Open Source Movement are documented on FSF's

website at

those who call the software ``Open Source'' are focused on a side issue.

User access to the source code of a program is a prerequisite to make use

of the freedom to modify.  However, the important issue is what freedoms

\subsection{The Freedom to Copy and Share}

Users may share Free Software in a variety of ways.  Free Software

age: choosing between obeying a software license, and friendship (by

giving away a copy of a program your friend who likes the software you are

using).  Free Software licenses, therefore, must permit this sort of

  source code can be practically obscured in binary-only distribution

  without reliance on any legal system.  However, the primary control

  mechanism for software is copyright.}.  Copyright law, with respect to

software\footnote{Copyright law in general also governs ``public

  performance'' of copyrighted works.  There is no generally agreed

  definition for public performance of software and version 2 of the GPL

Carefully note that software in the public domain is \emph{not} licensed

in any way.  It is nonsensical to say software is ``licensed for the

expressed permission to take actions governed by copyright law.

By contrast, what the copyright holder has done is renounce her copyright

its work today.  Specifically because of this ``embrace, proprietarize and

extend'' cycle, FSF made a conscious choice to copyright its Free Software,

and then license it under ``copyleft'' terms, and many, including the

Copyleft is a legal strategy to defend, uphold and propagate software

freedom.  The basic technique of copyleft is as follows: copyright the

soon for-profit companies discovered that the software could work for them

as well, and their system administrators began to use it in place of

Microsoft Windows NT file-servers.  This served to lower the cost of

The non-commercial users, however, were not concerned when these two

fellows began collecting paychecks off of their GPL'ed work.  They knew

how software freedom is respected.

\section{GPL \S 0: Freedom to Run}

\S 0, the opening section of GPL, sets forth that the work is governed by

copyright law.  It specifically points out that it is the ``copyright

contrast, unregulated uses are those that are not covered by the statue

nor determined by a court to be covered, but are common and enjoyed by

many users.  An example of unregulated use is reading a printout of the

how to be a better programmer.

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The GPL is often mistakenly criticized because it fails to give a

definition of ``derivative work''.  In fact, it would be incorrect and

fact, has no control over what may or may not be a derivative work.  This

matter is left up to copyright law, not the licenses that utilize it.

opinions must give us guidance to decide the border cases.

\section{GPL \S 1: Verbatim Copying}

GPL \S 1 covers the matter of redistributing the source code of a program

exactly as it was received.  This section is quite straightforward.

continues and develops, remains Free as in freedom.

To achieve that goal, \S 2 first sets forth that the rights of

copying, as presented in \S 1.  Therefore, the details of charging,

keeping copyright notices intact, and other \S 1 provisions are in tact

here as well.  However, there are three additional requirements.

took to them.  For some users, it is important to know that they are using

the standard version of program, because while there are many advantages

to using a fork, there are a few disadvantages.  Users should be informed

\medskip