[1] RFC 6844 - DNS Certification Authority Authorization (CAA) Resource Record (2015-03-15 21:22:05 +09:00 版) <https://tools.ietf.org/html/rfc6844>

[2] [cabfpub] Results on Ballot 187 - Make CAA Checking Mandatory ( (2017-03-16 06:42:26 +09:00)) <https://cabforum.org/pipermail/public/2017-March/009988.html>

[3] RFC 6844 - DNS Certification Authority Authorization (CAA) Resource Record ( (2017-03-05 18:55:50 +09:00)) <https://tools.ietf.org/html/rfc6844>

[4] RFC Errata Report » RFC Editor ( (2017-03-18 15:48:42 +09:00)) <https://www.rfc-editor.org/errata_search.php?rfc=6844>

[5] DNS CAA とは:SSL | DigiCert ( (2017-03-15 09:50:13 +09:00)) <https://rms-digicert.ne.jp/howto/basis/caa.html>