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<title>GLEP 23 -- Handling of ACCEPT_LICENSE</title>
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<tbody valign="top">
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<tr class="field"><th class="field-name">GLEP:</th><td class="field-body">23</td>
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</tr>
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<tr class="field"><th class="field-name">Title:</th><td class="field-body">Handling of ACCEPT_LICENSE</td>
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</tr>
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<tr class="field"><th class="field-name">Version:</th><td class="field-body">1.7</td>
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</tr>
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<tr class="field"><th class="field-name">Last-Modified:</th><td class="field-body"><a class="reference" href="http://www.gentoo.org/cgi-bin/viewcvs.cgi/xml/htdocs/proj/en/glep/glep-0023.txt?cvsroot=gentoo">2006/11/21 00:02:05</a></td>
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</tr>
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<tr class="field"><th class="field-name">Author:</th><td class="field-body">Jason Stubbs <jstubbs at gentoo.org>, Marius Mauch <genone at gentoo.org></td>
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</tr>
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<tr class="field"><th class="field-name">Status:</th><td class="field-body">Accepted</td>
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</tr>
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<tr class="field"><th class="field-name">Type:</th><td class="field-body">Standards Track</td>
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</tr>
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<tr class="field"><th class="field-name">Content-Type:</th><td class="field-body"><a class="reference" href="glep-0002.html">text/x-rst</a></td>
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</tr>
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<tr class="field"><th class="field-name">Created:</th><td class="field-body">9-Mar-2004</td>
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</tr>
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<tr class="field"><th class="field-name">Post-History:</th><td class="field-body">8-Mar-2004 10-Mar-2004 25-Oct-2004 18-Nov-2006 21-Nov-2006</td>
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</tr>
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</tbody>
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</table>
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<hr />
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<div class="contents topic">
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<p class="topic-title first"><a id="contents" name="contents">Contents</a></p>
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<ul class="simple">
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<li><a class="reference" href="#abstract" id="id5" name="id5">Abstract</a></li>
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<li><a class="reference" href="#status-update" id="id6" name="id6">Status Update</a></li>
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<li><a class="reference" href="#motivation" id="id7" name="id7">Motivation</a></li>
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<li><a class="reference" href="#specification" id="id8" name="id8">Specification</a><ul>
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<li><a class="reference" href="#ebuild-license-variable" id="id9" name="id9">Ebuild LICENSE Variable</a></li>
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<li><a class="reference" href="#license-groups" id="id10" name="id10">License Groups</a></li>
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<li><a class="reference" href="#accept-license" id="id11" name="id11">ACCEPT_LICENSE</a></li>
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<li><a class="reference" href="#behaviour" id="id12" name="id12">Behaviour</a></li>
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</ul>
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</li>
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<li><a class="reference" href="#rationale" id="id13" name="id13">Rationale</a></li>
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<li><a class="reference" href="#reference-implementation" id="id14" name="id14">Reference Implementation</a></li>
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<li><a class="reference" href="#backwards-compatibility" id="id15" name="id15">Backwards Compatibility</a></li>
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<li><a class="reference" href="#references" id="id16" name="id16">References</a></li>
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<li><a class="reference" href="#copyright" id="id17" name="id17">Copyright</a></li>
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</ul>
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</div>
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<div class="section">
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<h1><a class="toc-backref" href="#id5" id="abstract" name="abstract">Abstract</a></h1>
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<p>Currently, every ebuild in the main gentoo repository is required to have a
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valid LICENSE entry. However, the syntax of this entry is not officially
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defined and the entry itself is only used when outputting package
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details.</p>
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</div>
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<div class="section">
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<h1><a class="toc-backref" href="#id6" id="status-update" name="status-update">Status Update</a></h1>
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<p>Repoman has been updated to check for the LICENSE syntax.
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A development portage branch with support for ACCEPT_LICENSE
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and license groups exists.</p>
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</div>
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<div class="section">
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<h1><a class="toc-backref" href="#id7" id="motivation" name="motivation">Motivation</a></h1>
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<p>Many users wish to regulate the software they install with regards to
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licenses for various reasons <a class="footnote-reference" href="#id3" id="id1" name="id1">[1]</a>. Some want a system free of any
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software that is not OSI-approved; others are simply curious as to what
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licenses they are implicitly accepting.</p>
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<p>Furthermore, some software requires that a user interactively accept its
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license for its author's to consider it legally binding. This is
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currently implemented using <tt class="docutils literal"><span class="pre">eutils.eclass</span></tt>.</p>
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</div>
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<div class="section">
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<h1><a class="toc-backref" href="#id8" id="specification" name="specification">Specification</a></h1>
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<div class="section">
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<h2><a class="toc-backref" href="#id9" id="ebuild-license-variable" name="ebuild-license-variable">Ebuild LICENSE Variable</a></h2>
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<p>Most ebuilds are for software which is released under a single license.
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In these cases, the current LICENSE variable can remain as is. For
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example:</p>
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<pre class="literal-block">
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LICENSE="single-license"
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</pre>
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<p>However, there are several ebuilds for software which is released under
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several licenses, of which the user must accept one, some or all <a class="footnote-reference" href="#id4" id="id2" name="id2">[2]</a>.
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To complicate this, some ebuilds include optional components which fall
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under a different license.</p>
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<p>To accomodate these cases, LICENSE syntax should accomodate all
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functionality offered by a DEPEND string. To keep things simple, this
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GLEP proposes that the syntax be identical. For example:</p>
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<pre class="literal-block">
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LICENSE="mandatory-license
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|| ( choosable-licence1 chooseable-license-2 )
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useflag? ( optional-component-license )"
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</pre>
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<p>License names may contain [a-zA-Z0-9] (english alphanumeric characters),
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_ (underscore), - (dash), . (dot) and + (plus sign).</p>
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</div>
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<div class="section">
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<h2><a class="toc-backref" href="#id10" id="license-groups" name="license-groups">License Groups</a></h2>
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<p>Almost all users are willing to install any software that is
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FSF-approved. Other users are willing to install any software and
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implicitly accept its license. To this end, implementations will also
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need to handle grouping of licenses.</p>
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<p>At a minimum, there needs to be the groups <tt class="docutils literal"><span class="pre">GPL-COMPATIBLE</span></tt>,
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<tt class="docutils literal"><span class="pre">FSF-APPROVED</span></tt>, <tt class="docutils literal"><span class="pre">OSI-APPROVED</span></tt> and <tt class="docutils literal"><span class="pre">NON-MUST-HAVE-READ</span></tt>.
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<tt class="docutils literal"><span class="pre">NON-MUST-HAVE-READ</span></tt> licenses are those that don't require manual
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acceptance for to be considered legally binding. This is the current
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behaviour of portage.</p>
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<p>These groups are defined in a new file <tt class="docutils literal"><span class="pre">license_groups</span></tt> in
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the <tt class="docutils literal"><span class="pre">profiles</span></tt> subdirectory of the tree (or overlays).
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Details of handling groups defined in overlays is implementation dependent.</p>
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<p>The format of this file is</p>
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<pre class="literal-block">
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<groupname> <license1> <license2> ... <licenseN>
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</pre>
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<p>Also any line starting with # is ignored and may be used for comments.
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Group names use the same syntax as normal license names. Also license groups
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may contain other groups.
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License groups may not contain negated elements, so a group</p>
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<pre class="literal-block">
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mygroup foo -bar -bla
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</pre>
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<p>is illegal.</p>
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</div>
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<div class="section">
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<h2><a class="toc-backref" href="#id11" id="accept-license" name="accept-license">ACCEPT_LICENSE</a></h2>
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<p>This GLEP proposes that a user be able to explicitly accept or decline
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licenses by editing a new variable <tt class="docutils literal"><span class="pre">ACCEPT_LICENSE</span></tt> in
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<tt class="docutils literal"><span class="pre">/etc/make.conf</span></tt>. Again, to keep things simple, the syntax should be
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similar to that of other incrementals. For example:</p>
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<pre class="literal-block">
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ACCEPT_LICENSE="-* accepted-license -declined-license"
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</pre>
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<p>As an extension, <tt class="docutils literal"><span class="pre">ACCEPT_LICENSE</span></tt> must also support <a class="reference" href="#license-groups">license groups</a>.
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This GLEP proposes that the license group be prepended by the special
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character "<tt class="docutils literal"><span class="pre">@</span></tt>". For example:</p>
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<pre class="literal-block">
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ACCEPT_LICENSE="-* @FSF-APPROVED"
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</pre>
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<p>License groups may be negated with the result that all elements of that group
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are also negated.</p>
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<p>Portage will also offer a package.license facility to offer this functionality
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on a per-package base (analog to package.keywords), other implementations may
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implement such a facility differently or not at all.</p>
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</div>
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<div class="section">
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<h2><a class="toc-backref" href="#id12" id="behaviour" name="behaviour">Behaviour</a></h2>
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<p>Unaccepted licenses will be treated like any other masked package, that is
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the user interface of an implementation will display a message listing any
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license that has to be accepted before the package can be merged with a
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pointer to the exact license text.</p>
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<p>Past versions of this document proposed to handle license-masked packages
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like blockers, but this would be inconsistent with other visibility
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filters as well as the current blocker system (as a blocker affects two
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packages) and be more complicated to implement.</p>
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</div>
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</div>
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<div class="section">
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<h1><a class="toc-backref" href="#id13" id="rationale" name="rationale">Rationale</a></h1>
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<p>An implementation of this proposal should make it easy for users wishing
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to regulate their software without affecting those that don't.</p>
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</div>
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<div class="section">
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<h1><a class="toc-backref" href="#id14" id="reference-implementation" name="reference-implementation">Reference Implementation</a></h1>
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<p>Available in portage svn repository under main/branches/license-masking</p>
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</div>
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<div class="section">
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<h1><a class="toc-backref" href="#id15" id="backwards-compatibility" name="backwards-compatibility">Backwards Compatibility</a></h1>
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<p>There should be no change to the user experience without the user
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explicitly choosing to do so. This mandates that the
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configuration variable be named <tt class="docutils literal"><span class="pre">ACCEPT_LICENSE</span></tt> as some users may
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already have it set due to ebuilds using <tt class="docutils literal"><span class="pre">eutil.eclass</span></tt>'s
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implementation. It also mandates that the default <tt class="docutils literal"><span class="pre">ACCEPT_LICENSE</span></tt> be
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set to <tt class="docutils literal"><span class="pre">@NON-MUST-HAVE-READ</span></tt> in the main gentoo repository as implementations
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are not required to provide an internal default.</p>
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</div>
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<div class="section">
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<h1><a class="toc-backref" href="#id16" id="references" name="references">References</a></h1>
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<table class="docutils footnote" frame="void" id="id3" rules="none">
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<colgroup><col class="label" /><col /></colgroup>
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<tbody valign="top">
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<tr><td class="label"><a class="fn-backref" href="#id1" name="id3">[1]</a></td><td>Gentoo Linux Bug 17367
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(<a class="reference" href="http://bugs.gentoo.org/show_bug.cgi?id=17367">http://bugs.gentoo.org/show_bug.cgi?id=17367</a>)</td></tr>
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</tbody>
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</table>
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<table class="docutils footnote" frame="void" id="id4" rules="none">
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<colgroup><col class="label" /><col /></colgroup>
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<tbody valign="top">
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<tr><td class="label"><a class="fn-backref" href="#id2" name="id4">[2]</a></td><td>Gentoo Linux Bug 34146
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(<a class="reference" href="http://bugs.gentoo.org/show_bug.cgi?id=34146">http://bugs.gentoo.org/show_bug.cgi?id=34146</a>)</td></tr>
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</tbody>
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</table>
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</div>
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<div class="section">
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<h1><a class="toc-backref" href="#id17" id="copyright" name="copyright">Copyright</a></h1>
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<p>This document has been placed in the public domain.</p>
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