Windows Server 2012 has replaced the traditional ROM-BIOS with the new and improved industry boot standard known as UEFI (Unified Extensible Firmware Interface) BitLocker is finally usable on server systems. Early Launch Anti-Malware (ELAM) ensures that only known, digitally signed antimalware programs can load right after Secure Boot finishes (although it does not require UEFI or Secure Boot) ELAM is a feature shared with Windows 8, which ensures only known programs can.”]
Source: https://www.csoonline.com/article/2616005/windows-server-2012-doubles-down-on-security.html