Removable data drives can be unlocked using a password or a smart card. An SID protector can also be configured to unlock a drive by using user domain credentials. After encryption has started, the drive can also be automatically unlocked on a specific computer for a specific user account. System administrators can configure which options are available for users including password complexity and minimum length requirements. To unlock by using a SID protector, use manage-bde.exe:
Manage-bde.exe -protectors -add e: -sid domain\\username