RFC DocumentsRFC 6962 - Certificate Transparency11.1. 規範的参考文献このページの見出し11.1. 規範的参考文献11.1. 規範的参考文献 [RFC2119] Bradner, S., "Key words for use in RFCs to Indicate Requirement Levels", BCP 14, RFC 2119, March 1997.