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\title{GNU Lesser General Public License}
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\huge{LGPLv3 Second Discussion Draft Rationale}
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\Large{Free Software Foundation}
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\noindent
Copyright \copyright\ 2007 Free Software Foundation, Inc., 51 Franklin Street,
Fifth Floor, Boston, MA 02110-1301, USA\\ 

\noindent
Verbatim copying and distribution of this entire article are permitted
worldwide, without royalty, in any medium, provided this notice is
preserved.

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This document states the rationale for changes in the second discussion
draft of LGPLv3. The changes themselves are presented in the form of
markup, with \sout{strikeout} indicating text we have removed from the
draft and \textbf{bold} indicating text we have added. Footnotes state
the reasons for specific changes.  We refer to the first and second
discussion drafts of LGPLv3 as ``Draft 1'' and ``Draft 2,''
respectively. The second and third discussion drafts of GPLv3 are
referred to as ``GPLv3, Draft 2'' and ``GPLv3, Draft 3,'' respectively.

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Discussion Draft \textbf{2} of Version 3, \sout{27 July 2006} \textbf{3
April 2007}


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THIS IS A DRAFT, NOT A PUBLISHED VERSION OF THE \\ GNU LESSER GENERAL PUBLIC
LICENSE. 

\bigskip

 Copyright \copyright\ \sout{2006} \textbf{2007} Free Software
 Foundation, Inc.  \\ 51 Franklin Street, Fifth Floor,
 Boston, MA 02110-1301 USA \\ Everyone is permitted to copy and
 distribute verbatim copies of this license document, but changing it is
 not allowed.}
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 This version of the GNU Lesser General Public License incorporates
the terms and conditions of version 3 of the GNU General Public
License, supplemented by the additional permissions listed below.


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\section{Additional Definitions.} 

  As used herein, ``this License'' refers to version 3 of the GNU Lesser
General Public License, and the ``GNU GPL'' refers to version 3 of the
GNU General Public License.

  ``The Library'' refers to \sout{the Program as defined in section 0 of
the GNU GPL} \textbf{a covered work governed by this License, other than
an Application or a Combined Work as defined below}.\footnote{The
definition in Draft 1 was incomplete. In LGPLv3 as well as in LGPLv2.1,
``the Library'' is sometimes used to mean a work based on the
LGPL-covered work received by the licensee, though it does not refer to
Applications (works that use the Library, in LGPLv2.1 parlance) or
Combined Works (corresponding to works distributed under section 6 of
LGPLv2.1).  In Draft 2 we have defined a new term, ``Linked Version,''
to disambiguate ``Library'' where necessary.\label{Lib}}

  An ``Application'' is any work that makes use of an interface provided
by the Library\textbf{,} but which is not otherwise based on the
Library.  Defining a subclass of a class defined by the Library is
deemed a mode of using an interface provided by the Library.

  A ``Combined Work'' is a work \sout{containing portions of the
Library,}\footnote{The remainder of the definition makes this wording
redundant.} produced by combining or linking an Application with the
Library.  \textbf{The particular version of the Library with which the
Combined Work was made is also called the ``Linked
Version.''}\footnote{We use the term ``Linked Version'' in places where
``the Library'' would otherwise be unclear or confusing. See
n.~\ref{Lib}.\label{LV}}

  The ``Minimal Corresponding Source'' for a Combined Work means the
Corresponding Source for the Combined Work, excluding\sout{:}

\renewcommand{\labelenumi}{\sout{\alph{enumi}.}}
\begin{enumerate}

\item any source code for portions of the Combined Work that, considered
      in isolation, are based on the Application\textbf{,} and not on
      the \sout{Library} \textbf{Linked Version}\sout{; and}

\item \sout{any keys, other than keys that are necessary to install
      and/or execute a modified version of the Combined Work produced by
      recombining or relinking the Application with a modified version
      of the Library}.\footnote{Keys are no longer part of the
      definition of Corresponding Source.  The technical restrictions
      provisions of GPLv3, Draft 3 are presented as a condition on the
      right to convey object code in section 6 under certain
      circumstances. See GPLv3 Third Discussion Draft Rationale, Part I,
      \S\ 1.1.  We have accordingly deleted this part of the definition
      of Minimal Corresponding Source and added a clause concerning the
      limited requirement to provide Installation Information in
      subsection 4e.\label{keys}}

\end{enumerate}

  The ``Corresponding Application Code'' for a Combined Work means the
object code and/or source code for the Application, including any data
and utility programs needed for reproducing the Combined Work from the
Application, but excluding the System Libraries of the Combined Work.
 

\section{Exception to Section 3 of the GNU GPL.}

  You may convey a covered work under sections 3 and 4 of this License
without being bound by \sout{the second paragraph of} section 3 of the
GNU GPL.\footnote{Because the first paragraph of GPLv3, Draft 2, section
3 has been removed in GPLv3, Draft 3, the exception stated here now
applies to the entirety of that section of GPLv3.}


\section{Conveying Modified Versions.}

  If you modify a copy of the Library, and, in your modifications, a
facility refers to a function or data to be supplied by an Application
that uses the facility (other than as an argument passed when the
facility is invoked), then you may convey a copy of the modified
version:

\renewcommand{\labelenumi}{\alph{enumi}.}
\begin{enumerate}

\item under this License, provided that you make a good faith effort to
      ensure that, in the event an Application does not supply the
      function or data, the facility still operates, and performs
      whatever part of its purpose remains meaningful, or

\item under the GNU GPL, with none of the additional permissions of
      this License applicable to that copy.

\end{enumerate}


\section{Object Code Incorporating Material from Library Header Files.}

  The object code form of an Application may incorporate material from a
header file that is part of the Library.  You may \sout{copy
and}\footnote{In GPLv3, Draft 3, sections 4--6, we have deleted
references to ``copying,'' since those sections contain conditions on
conveying and not on all propagation, as permission to ``copy and
convey'' might seem to imply. See GPLv3 Third Discussion Draft
Rationale, Part II, sections 2, 4--6. We have made a corresponding
change in sections 3 and 4 of LGPLv3.\label{copyand}} convey such object
code under \sout{any}\footnote{This word was superfluous.\label{any}}
terms of your choice, provided that, if the incorporated material is not
limited to numerical parameters, data structure layouts and accessors,
or small macros, inline functions and templates (ten or fewer lines in
length), you do both of the following:

\begin{enumerate}

\item Give prominent notice with each copy of the object code that the
      Library is used in it and that the Library and its use are covered
      by this License.

\item Accompany the object code with a copy of the GNU GPL and this
      \sout{License} \textbf{license document}.\footnote{The reference
      to ``this License'' in Draft 1 was, strictly speaking, inaccurate,
      since ``this License'' in LGPLv3 refers to the set of terms in
      GPLv3 supplemented by the additional permissions in the LGPLv3
      license document.\label{lic-doc}}

\end{enumerate}


\section{Combined Works.}

  You may \sout{copy and}\footnote{See n.~\ref{copyand}.} convey a
Combined Work under \sout{any}\footnote{See n.~\ref{any}.} terms of your
choice that, taken together, effectively do not \sout{prohibit}
\textbf{restrict}\footnote{``Restrict'' is the correct word here. The
non-LGPL terms must allow any kind of modification of the Library
portions.} modification of the portions of the Library contained in the
Combined Work and reverse engineering for debugging such modifications,
if you also do each of the following:

\begin{enumerate}

\item Give prominent notice with each copy of the Combined Work that the
      Library is used in it and that the Library and its use are covered
      by this License.

\item Accompany the Combined Work with a copy of the GNU GPL and this
      \sout{License} \textbf{license document}.\footnote{See
      n.~\ref{lic-doc}.}

\item For a Combined Work that displays copyright notices during
      execution, include the copyright notice for the Library among
      these notices, as well as a reference directing the user to the
      copies of the GNU GPL and this \sout{License} \textbf{license
      document}.

\item Do one of the following:

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 \item Convey the Minimal Corresponding Source under the terms of this
       License, and the Corresponding Application Code in a form
       suitable for, and under terms that permit, the user to recombine
       or relink the Application with a modified version of the
       \sout{Library} \textbf{Linked Version}\footnote{See n.~\ref{LV}.}
       to produce a modified Combined Work, in the manner specified by
       section 6 of the GNU GPL for conveying Corresponding Source.

 \item Use a suitable shared library mechanism for linking with the
       Library.  A suitable mechanism is one that (a) uses at run time a
       copy of the Library already present on the user's computer
       system, and (b) will operate properly with a modified version of
       the Library that is interface-compatible with the \sout{version
       of the Library with which the Combined Work was made}
       \textbf{Linked Version}.

 \end{enumerate}

\renewcommand{\labelenumi}{\textbf{\alph{enumi}}.}

\item \textbf{Provide Installation Information, but only if you would
      otherwise be required to provide such information under section 6
      of the GNU GPL, and only to the extent that such information is
     necessary to install and execute a modified version of the Combined
     Work produced by recombining or relinking the Application with a
     modified version of the Linked Version. (If you use option 4d0, the
     Installation Information must accompany the Minimal Corresponding
     Source and Corresponding Application Code. If you use option 4d1,
     you must provide the Installation Information in the manner
     specified by section 6 of the GNU GPL for conveying Corresponding
     Source.)}\footnote{In Draft 1 a corresponding condition was
     contained in the definition of Minimal Corresponding Source. See
     n.~\ref{keys}. Subsection 4e reflects the more limited rule in
     GPLv3, Draft 3 to provide Installation Information where conveying
     occurs in User Products.  It captures some cases that were missed
     by the previous approach, however, because option 4d1 does not
     refer to Minimal Corresponding Source.}

\end{enumerate}


\section{Combined Libraries.}

  You may place library facilities that are a work based on the
Library side by side in a single library together with other library
facilities that are not Applications and are not covered by this
License, and convey such a combined library under terms of your
choice, if you do both of the following:

\renewcommand{\labelenumi}{\alph{enumi}.}
\begin{enumerate}

\item Accompany the combined library with a copy of the same work based
      on the Library, uncombined with any other library facilities,
      conveyed under the terms of this License.

\item Give prominent notice with the combined library that part of it is
      a work based on the Library, \textbf{and} explaining where to find
      the accompanying uncombined form of the same work.

\end{enumerate}

\section{Revised Versions of the GNU Lesser General Public License.}

  The Free Software Foundation may publish revised and/or new versions
of the GNU Lesser General Public License from time to time. Such new
versions will be similar in spirit to the present version, but may
differ in detail to address new problems or concerns.

  Each version is given a distinguishing version number. If the Library
\textbf{as you received it}\footnote{Here ``the Library'' is intended to
mean the LGPL-covered work as received by a user. The additional words
make this clear. See n.~\ref{Lib}.} specifies that a certain numbered
version of the GNU Lesser General Public License ``or any later
version'' applies to it, you have the option of following the terms and
conditions either of that published version or of any later version
published by the Free Software Foundation. If the Library \textbf{as you
received it} does not specify a version number of the GNU Lesser General
Public License, you may choose any version of the GNU Lesser General
Public License ever published by the Free Software Foundation.

  \textbf{If the Library as you received it specifies that a proxy can
decide whether future versions of the GNU Lesser General Public License
shall apply, that proxy's public statement of acceptance of any version
is permanent authorization for you to choose that version for the
Library.}\footnote{We have added a corresponding permission in GPLv3,
Draft 3, section 14.}
 


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