Kevin Kofler wrote:
One more concern I see is that, since CC0 by design does not require
attribution, there is actually no way to know that the package does not
contain unattributed CC0 code that was unilaterally relicensed by a third
party.
That is true [1] although the point generalizes to noncompliant but undetected uses of
code under other licenses Fedora considers problematic (but which have attribution-like
provisions). I think this is probably a fairly small risk, and not a reason not to
reclassify CC0 from being fully "allowed".
[1] Although I think you can read the CC0 fallback license as not allowing such unilateral
relicensing.
Richard