CC0 FAQ - Creative Commons
https://wiki.creativecommons.org/index.php?title=CC0_FAQ&oldid=115442#May_I_apply_CC0_to_computer_software.3F_If_so.2C_is_there_a_recommended_implementation.3F
> However, CC0 has not been approved by the Open Source Initiative and does not license or otherwise affect any patent rights you may have.
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https://www.gnu.org/licenses/license-list.en.html#Unlicense
> If you want to release your work to the public domain, we recommend you use CC0. CC0 also provides a public domain dedication with a fallback license, and is more thorough and mature than the Unlicense.
https://www.gnu.org/licenses/license-list.en.html#CC0
> If you want to release your non-software work to the public domain, we recommend you use CC0. For works of software it is not recommended, as CC0 has a term expressly stating it does not grant you any patent licenses.