i think the FSF would consider that non-free - the wording which would make it non-free is very similar to the old unicode license, which according to the parabola bug tracker, the FSF decided was non-free because of that wording
https://labs.parabola.nu/issues/674 parabola has been patching ruby for 9 years, only to replace that one file with the old unicode license WRT this mailing list, i found only these two mentions of it; but neither had a follow-up with a definitive decision https://lists.nongnu.org/archive/html/gnu-linux-libre/2013-05/msg00000.html https://lists.nongnu.org/archive/html/gnu-linux-libre/2014-10/msg00000.html
