BitLocker (formerly BitLocker Drive Encryption) is a full disk encryption feature included with the Ultimate and Enterprise editions of Windows Vista and Windows 7, the Pro and Enterprise editions of Windows 8 and Windows 8.1, and Windows Server 2008 and later.
BitLocker Drive Encryption — проприетарная технология, являющаяся частью операционных систем Microsoft Windows Vista Ultimate/Enterprise, Windows 7 Ultimate/Enterprise, Windows Server 2008 R2 и Windows 8.