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* [[Liblicense/Screenshots|Screenshots]]
* [[Liblicense/Screenshots|Screenshots]]
* [[License RDF|RDF Reference]]
* [[License RDF|RDF Reference]]
* [[Liblicense/Metadata_Table|File Metadata Information]]
* [http://labs.creativecommons.org/~nathan/liblicense Library Documentation] (generated from source)
* [http://labs.creativecommons.org/~nathan/liblicense Library Documentation] (generated from source)
* [[Buildbot]] helps test out liblicense on various platforms.
* [[Buildbot]] helps test out liblicense on various platforms.
=== Table of File Metadata Information ===
<table border="1">
<tr>
<td><strong>Format</strong></td><td><strong>Form of Metadata</strong></td><td><strong>Location of Metadata</strong></td><td><strong>Links</strong></td>
</tr>
<tr><td colspan="4"><strong>Audio</strong></td></tr>
<tr>
  <td>MP3</td>
  <td>XMP / Native id3 tags</td>
  <td>The PRIV,XMP field / WCOP tag</td>
  <td>[http://partners.adobe.com/public/developer/en/xmp/sdk/XMPspecification.pdf XMP Spec]
[http://www.id3.org/id3v2.3.0 ID3v2.3 Spec]</td>
</tr>
<tr>
  <td>Vorbis</td>
  <td>XMP / Native comment field</td>
  <td>XMP comment field / LICENSE comment field</td>
  <td>[http://xiph.org/vorbis/doc/v-comment.html Ogg Vorbis Docs]</td>
</tr>
<tr>
  <td>FLAC</td>
  <td>Native comment fields (id3v2 or vorbis-style comments)</td>
  <td>Same as with MP3 for id3v2 or Vorbis for vorbis-style comments</td>
  <td>[http://flac.sourceforge.net/format.html#metadata_block_vorbis_comment FLAC Format Spec]</td>
</tr>
<tr>
  <td>Monkey's Audio (APE)</td>
  <td>Native Vorbis-like comment field</td>
  <td>AFAIK, there is no standard tag spec</td>
  <td></td>
</tr>
<tr><td colspan="4"><strong>Images</strong></td></tr>
<tr>
  <td>JPEG</td>
  <td>XMP</td>
  <td>APP1 Markers</td>
  <td>[http://partners.adobe.com/public/developer/en/xmp/sdk/XMPspecification.pdf XMP Spec]</td>
</tr>
<tr>
  <td>JPEG 2000</td>
  <td>XMP</td>
  <td>UUID Box</td>
  <td>[http://partners.adobe.com/public/developer/en/xmp/sdk/XMPspecification.pdf XMP Spec]</td>
</tr>
<tr>
  <td>TIFF</td>
  <td>XMP</td>
  <td>XMLPacket tag</td>
  <td>[http://partners.adobe.com/public/developer/en/xmp/sdk/XMPspecification.pdf XMP Spec]</td>
</tr>
<tr>
  <td>PNG</td>
  <td>XMP</td>
  <td>iTXt, XML:com:adobe:xmp field</td>
  <td>[http://partners.adobe.com/public/developer/en/xmp/sdk/XMPspecification.pdf XMP Spec]</td>
</tr>
<tr>
  <td>GIF</td>
  <td>XMP</td>
  <td>Application block</td>
  <td>[http://partners.adobe.com/public/developer/en/xmp/sdk/XMPspecification.pdf XMP Spec]</td>
</tr>
<tr>
  <td>SVG</td>
  <td>RDF</td>
  <td>/svg/metadata/rdf</td>
  <td>[http://wiki.creativecommons.org/SVG CC Wiki, SVG, based on Inkscape]</td>
</tr>
<tr>
  <td>PSD (Adobe Photoshop)</td>
  <td>XMP</td>
  <td>Resource block</td>
  <td>[http://partners.adobe.com/public/developer/en/xmp/sdk/XMPspecification.pdf XMP Spec]</td>
</tr>
<tr><td colspan="4"><strong>Video</strong></td></tr>
<tr>
  <td>AVI</td>
  <td>?</td>
  <td>?</td>
  <td>[http://partners.adobe.com/public/developer/en/xmp/sdk/XMPspecification.pdf XMP Spec]</td>
</tr>
<tr>
  <td>Matroska</td>
  <td>Native tag</td>
  <td>COPYRIGHT tag</td>
  <td>[http://www.matroska.org/technical/specs/tagging/index.html Matroska Tagging Spec]</td>
</tr>
<tr>
  <td>Quicktime</td>
  <td>Native tag</td>
  <td>kMDItemCopyright(old)/kUserDataTextCopyright(new) tag</td>
  <td>[http://developer.apple.com/documentation/QuickTime/Conceptual/QT7UpdateGuide/Chapter03/chapter_3_section_1.html#//apple_ref/doc/uid/TP40001163-CH314-553378 Quicktime 7 API Reference]
[http://partners.adobe.com/public/developer/en/xmp/sdk/XMPspecification.pdf XMP Spec]</td>
</tr>
<tr>
  <td>OGG</td>
  <td>No metadata standard</td>
  <td></td>
  <td>[http://wiki.xiph.org/Metadata Ogg Metadata Draft]</td>
</tr>
<tr>
  <td>Theora</td>
  <td colspan="2">Theora comments (similar to Vorbis comments)</td>
  <td>[http://www.theora.org/doc/Theora_I_spec.pdf Theora Spec]</td>
</tr>
<tr>
  <td>Flash</td>
  <td>RDF</td>
  <td>?</td>
  <td></td>
</tr>
<tr><td colspan="4"><strong>Documents</strong></td></tr>
<tr>
  <td>PDF</td>
  <td>XMP</td>
  <td>metadata field</td>
  <td>[http://partners.adobe.com/public/developer/en/xmp/sdk/XMPspecification.pdf XMP Spec]</td>
</tr>
<tr>
  <td>Postscript/EPS</td>
  <td>XMP</td>
  <td>Document-level metadata</td>
  <td>[http://partners.adobe.com/public/developer/en/xmp/sdk/XMPspecification.pdf XMP Spec]</td>
</tr>
<tr>
  <td>HTML</td>
  <td>RDFa</td>
  <td>&lt;a rel="license" href="..."&gt;&lt;/a&gt;</td>
  <td>[http://wiki.creativecommons.org/RDFa CC Wiki, RDFa]</td>
</tr>
<tr>
  <td>SMIL</td>
  <td>RDF</td>
  <td>/smil/head/metadata@id="meta-rdf"/RDF</td>
  <td>[http://web.resource.org/cc/modules/smil/ CreativeCommons SMIL Module]</td>
</tr>
<tr>
  <td>RSS 1.0</td>
  <td colspan="2">/RDF/channel/license or /RDF/channel/item/license</td>
  <td>[http://web.resource.org/rss/1.0/modules/cc/ CreativeCommons RSS 1.0 Module]</td>
</tr>
<tr>
  <td>RSS 2.0</td>
  <td colspan="2">/rss/channel/cc:license or /rss/channel/item/cc:license</td>
  <td>[http://backend.userland.com/creativeCommonsRssModule CreativeCommons RSS 2.0 Module]</td>
</tr>
<tr>
  <td>Atom</td>
  <td colspan="2">/feed/entry/link@rel=license</td>
  <td>[http://ietfreport.isoc.org/idref/draft-snell-atompub-feed-license/ Atom License Extension]</td>
</tr>
<tr>
  <td>Any XML</td>
  <td>XMP</td>
  <td>Wherever valid</td>
  <td>[http://partners.adobe.com/public/developer/en/xmp/sdk/XMPspecification.pdf XMP Spec]</td>
</tr>
<tr>
  <td>OpenOffice.org (OASIS)</td>
  <td colspan="2">OO.org CC License Add-In SoC Project is working on the spec</td>
  <td></td>
</tr>
<tr>
  <td>MS Office (2003)</td>
  <td>DocumentSummaryInformation Infile</td>
  <td>CreativeCommons_LicenseURL property</td>
  <td>[http://www.microsoft.com/downloads/details.aspx?FamilyID=113b53dd-1cc0-4fbe-9e1d-b91d07c76504&displaylang=en Office Add-in]</td>
</tr>
<tr>
  <td>MS Office OpenXML (2007)</td>
  <td>?</td>
  <td>?</td>
  <td>[http://www.ecma-international.org/publications/standards/Ecma-376.htm OpenXML Spec]
[http://lists.ibiblio.org/pipermail/cc-devel/2007-June/000466.html Relevant mailing list post]</td>
</tr>
</table>


== See Also ==
== See Also ==

Revision as of 19:25, 9 October 2008

What is liblicense?

In short: Low-level license metadata integration for applications.

liblicense provides a straight-forward way for developers to build license-aware applications. liblicense utilizes a pluggable module system for reading and writing metadata from specific file types, allowing extensibility for specific content types.

  • To see liblicense in action take a look at License tagger, the cross platform file metadata editor.

Features

  • Extract and write license information for files
  • Supports enumeration of available licenses
  • Wraps internationalized license information for Creative Commons licenses
  • Bindings for dynamic languages (currently Python and Ruby)
  • Extensible support for file types using module system
  • No specific GUI library dependency allows applications to build the graphical chooser most appropriate for their platform.

Future Improvements

Architecture

Liblicense Architecture - SVG

Bindings

Media

See Operating System Mockups for ideas on how liblicense could be integrated into various platforms.

Download

Developers: Using git

If you want to check out the source code and develop on it, use this command: 

git clone git://code.creativecommons.org/liblicense.git
git submodule init
git submodule update

That should give you a working copy you can commit to. See Git for information on switching to a working copy you can push using.

More Information

See Also


Liblicense
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