[cabfpub] Ballot 202 - Underscore and Wildcard Characters
jsha at letsencrypt.org
Thu Jul 20 16:16:08 MST 2017
If people are curious, as I was, about why RFC 5890 restricts use of
Reserved LDH Labels, here is what I believe to be the relevant paragraph:
> Labels within the class of R-LDH labels that are not prefixed with
> "xn--" are also not valid IDNA labels. To allow for future use of
> mechanisms similar to IDNA, *those labels MUST NOT be processed as*
*> ordinary LDH labels by IDNA-conforming programs* and SHOULD NOT be
> mixed with IDNA labels in the same zone.
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