[Flags]
private enum CryptProtectFlags {
    // for remote-access situations where ui is not an option
    // if UI was specified on protect or unprotect operation, the call
    // will fail and GetLastError() will indicate ERROR_PASSWORD_RESTRICTION
    CRYPTPROTECT_UI_FORBIDDEN = 0x1,

    // per machine protected data -- any user on machine where CryptProtectData
    // took place may CryptUnprotectData
    CRYPTPROTECT_LOCAL_MACHINE = 0x4,

    // force credential synchronize during CryptProtectData()
    // Synchronize is only operation that occurs during this operation
    CRYPTPROTECT_CRED_SYNC = 0x8,

    // Generate an Audit on protect and unprotect operations
    CRYPTPROTECT_AUDIT = 0x10,

    // Protect data with a non-recoverable key
    CRYPTPROTECT_NO_RECOVERY = 0x20,

    // Verify the protection of a protected blob
    CRYPTPROTECT_VERIFY_PROTECTION = 0x40
}

VB Definition:

<Flags()> Enum CryptProtectFlags
    ' for remote-access situations where ui is not an option
    ' if UI was specified on protect or unprotect operation, the call
    ' will fail and GetLastError() will indicate ERROR_PASSWORD_RESTRICTION
    CRYPTPROTECT_UI_FORBIDDEN = &H1

    ' per machine protected data -- any user on machine where CryptProtectData
    ' took place may CryptUnprotectData
    CRYPTPROTECT_LOCAL_MACHINE = &H4

    ' force credential synchronize during CryptProtectData()
    ' Synchronize is only operation that occurs during this operation
    CRYPTPROTECT_CRED_SYNC = &H8

    ' Generate an Audit on protect and unprotect operations
    CRYPTPROTECT_AUDIT = &H10

    ' Protect data with a non-recoverable key
    CRYPTPROTECT_NO_RECOVERY = &H20

    ' Verify the protection of a protected blob
    CRYPTPROTECT_VERIFY_PROTECTION = &H40
End Enum