The Free Software Foundation[11][12] and the Open Knowledge Foundation approved CC0 as a recommended license to dedicate content and software to the public domain.

In October 2014 the Open Knowledge Foundation recommends the Creative Commons CC0 license to dedicate content to the public domain,[51][52] and the Open Data Commons Public Domain Dedication and License (PDDL) for data.[53]

When data is public domain it is recommended to use the CC0 Public Domain license for clarity.