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seven largest certificate authorities: Comodo, Symantec, Trend Micro, DigiCert, Entrust, GlobalSign and GoDaddy. "Members of the CA - Browser Forum

Retrieved 2013-04-23.  Wilson, Wilson. "CA/Browser Forum History" (PDF). DigiCert. Retrieved 2013-04-23.  "CA-2001-04". Cert.org. Retrieved 2014-06-11.