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bkuhn

Preservation of implied patent license is unique.

This footnote, co-drafted by me and Richard Fontana, explains the
apparent uniqueness GPLv3's preservation clause for GPLv2's original
implied patent license.

Fontana pointed out this distinction with commercial patent licensing.
I noticed as a further point that even some copyleft licenses, let alone
non-copyleft Free Software licenses, fail to include any clauses
preserving implicit patent license grants. Such is certainly of concern
for those licenses that contain explicit patent licensing provisions.

Fontana notes that during GPLv3 process, he was concerned that an
explicit patent license in GPLv3 might provide a basis for some to later
argue an implied patent license was no longer present. GPLv3§11's final
paragraph assures its safety.

\Preamble{xhtml}
\begin{document}

%% Note: if you install locally, you'll be missing some of the files, marked
%% below as ``on copyleft.org, not here''.  That's because they're part of the
%% copyleft.org wiki when we install HTML.  You're still going to be able to
%% view the HTML, but it won't look as ``pretty'' and won't have fully
%% branding with copyleft.org stuff (which is probably as it should be).  The
%% main thing that will probably annoy is is footnotes won't work.

%% Begin: on copyleft.org, not here.
  \Configure{@HEAD}{\HCode{<link rel="shortcut icon" type="image/x-icon" href="/favicon.ico" /> }}
  \Configure{@HEAD}{\HCode{<link rel="stylesheet" type="text/css" href="/bootstrap.css" /> \Hnewline}}
  \Configure{@HEAD}{\HCode{<link rel="stylesheet" type="text/css" href="/local.css" /> \Hnewline}}
%% End: on copyleft.org, not here.

  \Configure{@HEAD}{\HCode{<link rel="stylesheet" type="text/css" href="css/footnote-hack.css" /> \Hnewline}}
  \Configure{@HEAD}{\HCode{<link rel="stylesheet" type="text/css" href="css/guide.css" /> \Hnewline}}

%% Begin: on copyleft.org, not here.
  \Configure{@HEAD}{\HCode{<script type="text/javascript" src="/bootstrap.js"></script>\Hnewline}}
  \Configure{@HEAD}{\HCode{<script type="text/javascript" src="/jquery-1.10.2.js"></script>\Hnewline}}
  \Configure{@HEAD}{\HCode{<script type="text/javascript" src="/jquery-ui-1.11.2.js"></script>\Hnewline}}
%% End: on copyleft.org, not here.


  \Configure{@HEAD}{\HCode{<script type="text/javascript" src="js/comprehensive-gpl-guide-js.js"></script>\Hnewline}}
  \Configure{@HEAD}{\HCode{<script type="text/javascript" src="js/tex4ht-footnote-hack.js"></script>\Hnewline}}


%% This stuff below uses bootstrap to get a navigation bar.

% This SVG should replace <img> below, but users complained. :-/
  
%          <svg width="245" height="50" style="margin-bottom: 5px; margin-top: 5px; margin-left: 5px; margin-right: 50px"><image xlink:href="/copyleftorg-green-stylized.svg" src="/copyleftorg-green-stylized.png" width="245" height="50"></image></svg>\Hnewline
  \Configure{@BODY}{\HCode{<header class="navbar navbar-default navbar-fixed-top copyleft-navbar">\Hnewline
      <div class="container">\Hnewline
        <div class="navbar-header">\Hnewline
          <button class="navbar-toggle" data-target=".copyleft-navbar-collapse" data-toggle="collapse" type="button">\Hnewline
            <span class="sr-only">Toggle navigation</span>\Hnewline
            <span class="icon-bar"></span>\Hnewline
            <span class="icon-bar"></span>\Hnewline
            <span class="icon-bar"></span>\Hnewline
          </button>\Hnewline
          <a href="/"><img style="margin-bottom: 5px; margin-top: 5px; margin-left: 5px; margin-right: 50px" alt="copyleft.org" src="/copyleftorg-green-stylized.png" width="245" height="50"></img></a>\Hnewline
        </div>\Hnewline
        <nav class="collapse navbar-collapse copyleft-navbar-collapse" role="navigation"><ul class="nav navbar-nav">\Hnewline}}
\Configure{@BODY}{\selectpropermenuitem\HCode{<li><a href="/guide/comprehensive-gpl-guide.pdf">PDF</a></li>\Hnewline
       <li><a href="/guide/comprehensive-gpl-guide.ps">Postscript</a></li></ul>\Hnewline
          <ul class="nav navbar-nav navbar-right">\Hnewline
        <li><a href="/">Wiki</a></li>\Hnewline
        <li class="active"><a href="/guide/">Tutorial and Guide</a></li>\Hnewline
        </ul></nav></div></header>\Hnewline}}

\monolith

\Configure{crosslinks}{\HCode{<li>}}{\HCode{</li>}}{next}{prev-top}{prev-end}{this-top}{this-end}{up}
\Configure{crosslinks+}
   {\HCode{<nav class="collapse navbar-collapse copyleft-navbar-collapse" role="navigation">\Hnewline
<ul class="nav navbar-nav">}}
   {\HCode{</ul></nav>}}
   {\footermenu\HCode{<nav class="collapse navbar-collapse copyleft-navbar-collapse" role="navigation">\Hnewline
<ul class="nav navbar-nav navbar-right">\Hnewline}}
   {\HCode{</ul></nav></div></footer>}}

\Tag{TITLE+}{Copyleft and the GNU General Public License: A Comprehensive Tutorial and Guide}

\EndPreamble