In 2009, Creative Commons released CC0, which was created for compatibility with jurisdictions where dedicating to public domain is problematic, such as continental Europe.
[7][10] In June 2016 an analysis of the Fedora Project's software packages placed CC0 as the 17th most popular license.
[16] It is listed by the Software Package Data Exchange as the Zero Clause BSD license, with the SPDX identifier 0BSD.
[18] In the free-software community, there has been some controversy over whether a public domain dedication constitutes a valid open-source license.
[20] In 2012, Rosen changed his mind, accepted CC0 as an open-source license, and admitted that, contrary to his previous claims, copyright can be waived away.
[25][10] In July 2022, the Fedora Project deprecated CC0 for software code for the same reasons, but will still allow its use for non-code content.