Difference between revisions of "License Properties"

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Revision as of 16:26, 10 September 2007

In addition to the human readable license deeds and legal code, Creative Commons provides machine readable metadata for licenses. This page describes how to begin with a license URI and map it to license attributes.

Attributes Overview

License Attributes fall into one of three classes: permissions, prohibitions and requirements. Permissions declare a permission given by the license, above and beyond what default copyright law allows. Prohibitions prohibit a particular use of the work, specifically affecting the scope of the permissions provided by a permission. Requirements describe actions required of user when making use of the permissions.

A list of permissions, prohibitions and requirements defined by Creative Commons is available at http://creativecommons.org/ns.

The machine-readable license metadata is described using [RDF]. Each type of attribute corresponds to a predicate:

  • cc:permits
  • cc:prohibits
  • cc:requires

Using RDFa

RDFa is an editor's draft at W3 which describes a way to serialize [RDF] triples in HTML. Creative Commons includes the appropriate RDFa When selecting a license from http://creativecommons.org/license to indicate that a page is licensed. For example:

 <a href="http://creativecommons.org/licenses/by/3.0/" rel="license">Attribution 3.0</a>

The rel="license" attribute indicates that the link specified (the license URL in this case) has special semantic meaning.

With the license URI, an RDFa parser may be used to extract license attributes from the human readable deed.

Additional Resources

"Simple" Mapping

If parsing the deed is not feasible, it is possible to infer attributes from the license URI.