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