There are a variety of options for licensing work produced by ODM ranging from copyright (all rights reserved) to copyleft (some rights reserved, sharealike) to public domain (do what you want) each with their respective pros and cons. This document will outline some of the issues and will contain reference for discussion.

• Attribution - whoever uses the work has to attribute the creator of the work.
• Share Alike - if the work is modified then it has to be released with the same conditions for distribution as the original work (that is, keep on sharing).
• Derivative work - some licenses require derivative works to be released under a sharealike license too, others don't.
• Release changes under a different license - do we insist that all modifications and derivative work are released under an open license? Wordpress is released under the GPLv2 and CKAN under the AGPL3 which means any derivative work will have to be released under a similar license (see Drupal licensing FAQ for details).

Data in general means information in a structured format such as CSV,JSON,XML or other information that is meant to be machine readable or can easily be inserted into a Database and where any derivative work is not generally one that the user sees as opposed to creative works.

• Open Data Commons Open Database License (ODbL) Attribution and Share-Alike for Data/Databases
• Open Data Commons Attribution License Attribution for Data/Databases
• Open Data Commons Public Domain Dedication and License (PDDL) Places the data(base) in the public domain (waiving all rights)

By content I mean prose, graphics and other

• Comparison_of_free_and_open-source_software_licenses
• Drupal licensing FAQ
• Apache licensing FAQ
• Why OpenStreetMap Dropped the Creative Commons License
• Set of legal tools to help you provide and use Open Data