Mike Linksvayer has a new post on why it isn’t a good idea to using the CC0 license for public domain software. From the post:
We hadn’t set out with CC0 to improve on public domain dedications for software. However, since the release of CC0, we’ve been approached a number of times about using CC0 to dedicate software to the public domain. While we were happy to hear of this unanticipated demand, we wanted to tread very carefully so as to not create any unintended consequences for the free software ecosystem.
Note: Mike Linksvayer clarifies that it is actually acceptable to use CC0 for public domain software.