(28-02-2019, 04:28 PM)jkl Wrote: Where is the difference between CC0 and other pseudo-Public Domain licenses?

As mentioned above, my understanding is that this section is the critical part:

Quote:3. Public License Fallback. Should any part of the Waiver for any reason
be judged legally invalid or ineffective under applicable law, then the
Waiver shall be preserved to the maximum extent permitted taking into
account Affirmer's express Statement of Purpose.

So as compared to Unlicense, for example, you'll ensure that no matter what the actual legal situation is, you'll get as close as possible. Other issues with Unlicense can be found here.