Recently Fedora has stopped accepting "Creative Commons Zero" license for code:
https://lists.fedoraproject.org/archives/list/legal@lists.fedoraproject.org/thread/RRYM3CLYJYW64VSQIXY6IF3TCDZGS6LM/
I've licensed a significant amount of code under CC0, with the intent being that this was the same as public domain. But Fedora believes, not unreasonably, that CC0's wording creates patent risks not present in other licenses. For this reason:
I, Andi McClure, by this public notice additionally-license all content I released under CC0 before 2025-01-01, as BSD-0 ( https://opensource.org/license/0bsd ).