Error 0x80310079

Value: -2144272263 | 0x80310079 | 2150695033

What does it mean ?

FVE_E_POLICY_USER_DISABLE_RDV_NOT_ALLOWED  
Group Policy settings do not permit turning off BitLocker Drive Encryption on removable data drives. Please contact your system administrator if you need to turn off BitLocker.
Value: 121 | 0x0079 | 0b0000000001111001

Where does it come from ?

FACILITY_FVE  
Full volume encryption
Value: 49 | 0x031 | 0b00110001

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