Quote:
Originally Posted by salty-horse
Which also makes the original question confusing.
Are they asking for works that are specifically licensed under CC0 (I don't know of any), or any public domain works?
re "legal mechanism" - is there such a thing? I assume that unless a claim is repeatedly defended in court, you can't really be sure if it works.
I assume it's more robust than simple amateur statements along the lines "I hereby waive all rights", but maybe these are fine too.
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I agree that "CC0" should probably not be used interchangeably with "Public Domain" (which is what I assume the OP did).
I'm not aware of any court-tested legal mechanisms for waiving rights, either. While I'm certainly not a lawyer, I suspect that proof that a work was "formally" released under a CC0 license might go a long way toward protecting someone who used said work after someone attempted to regain the rights that were originally waived.
You may still be able to legally unring that particular bell, but I suspect it might remain difficult to defend your rights against those who took your "waiving of any and all rights" at face value.