rel-license

2008-08-28T09:14:50Z

Mrflip: /* List of Licenses */ OSI license list

= rel="license" =

Rel-License is a simple, open, format for indicating content licenses which is embedable in HTML or XHTML, Atom, RSS, and arbitrary XML. Rel-License is one of several [[microformats|microformat]] open standards.

__TOC__

== Specification 2005-02-06 ==
=== Author ===
[http://tantek.com/ Tantek Çelik] ([http://technorati.com Technorati, Inc.], formerly of [http://microsoft.com/ Microsoft Corporation])

=== Copyright ===
Per the public domain release on [[User:Tantek|my user page]], this specification is released into the public domain.

{{MicroFormatPublicDomainContributionStatement}}

=== Patents ===
{{MicroFormatPatentStatement}}

== Abstract ==
Rel-License is one of several microformats. By adding <code>rel="license"</code> to a hyperlink, a page indicates that the destination of that hyperlink is a license for the current page. E.g. with the following hyperlink:

<pre><nowiki>
<a href="http://creativecommons.org/licenses/by/2.0/" rel="license">cc by 2.0</a>
</nowiki></pre>

the author indicates that the page is licensed under a Creative Commons 2.0 Attribution Required license.

== Multiple Licenses ==
Multiple such rel="license" hyperlinks indicate that the page is available under any of the referred licenses. E.g. the following hyperlinks could be used to declare that a page is available under either a Creative Commons 2.0 Attribution Required license or the Apache 2.0 license:

<pre><nowiki><a href="http://creativecommons.org/licenses/by/2.0/" rel="license">cc by 2.0</a>
<a href="http://www.apache.org/licenses/LICENSE-2.0" rel="license">Apache 2.0</a></nowiki></pre>

== XMDP profile ==
<pre><nowiki>
<dl class="profile">
<dt id="rel">rel</dt>
<dd><p>
<a rel="help" href="http://www.w3.org/TR/html401/struct/links.html#adef-rel">
HTML4 definition of the 'rel' attribute.</a>
Here is an additional value.</p>
<dl>
<dt id="license">license</dt>
<dd>Indicates that the referred resource is a license for the referring page.</dd>
</dl>
</dd>
</dl>
</nowiki></pre>

== Implementations ==
* [http://www.webstandards.org/action/dwtf/microformats/ Dreamweaver Extension suite] from the [http://webstandards.org/ Web Standards Project] enables the authoring of rel-license links from within Dreamweaver 8. Includes (cc) defaults.
* [http://placenamehere.com/TXP/pnh_mf/ pnh_mf] is a plugin for [http://textpattern.com/ Textpattern] that supports embedding rel license and other microformats in templates and blog posts. Written by [http://placenamehere.com/ Chris Casciano].
* [http://creativecommons.org/license/ Creative Commons (cc) license chooser]
* [http://search.yahoo.com/cc Yahoo! (cc) search] (appears to pick up link-rel in a but not link elements)
* [http://www.google.com/support/bin/answer.py?answer=29508 Google "Usage Rights" search] (also appears to pick up link-rel in a but not link elements)

== List of Licenses ==

* [http://creativecommons.org CC]
* [http://www.opensource.org/licenses/ Open Source Initiative] licenses -- mostly software-focused

== References ==
=== Normative References ===
* [http://gmpg.org/xmdp/ XMDP]

=== Informative References ===
* 20040211 rel="license" first proposed in presentation [http://tantek.com/presentations/2004etech/realworldsemanticspres.html real world semantics] at 2004 O'Reilly Emerging Technologies Conference, San Diego, CA, USA.
* 20040225 [http://tantek.com/log/2004/02.html#d25t1805 Thorough discussion of rel="license"] including advantages and presentation possibilities.
* [http://creativecommons.org/licenses/by/2.0/ Creative Commons 2.0 By (Attribution Required) license]
* [http://www.apache.org/licenses/LICENSE-2.0 Apache 2.0 license]
* Contributed from http://developers.technorati.com/wiki/RelLicense
* [http://microformatique.com/?p=60 Know your rel-license at Microformatique]

== see also ==
* [[rel-license-issues]] - issues which have been raised with this microformat.
* [[rel-faq]]

Microformats Wiki - User contributions [en]

rel-license