Sub Example_Action()
    ' Этот пример зашифровал и сохраняет файл.

    Dim acad As New AcadApplication
    Dim sp As New AcadSecurityParams
    
    acad.Visible = True
    sp.Action = AcadSecurityParamsType.ACADSECURITYPARAMS_ENCRYPT_DATA
    sp.Algorithm = AcadSecurityParamsConstants.ACADSECURITYPARAMS_ALGID_RC4
    sp.KeyLength = 40
    sp.Password = UCase("mypassword") 'AutoCAD converts all passwords to uppercase before applying them
    sp.ProviderName = "Microsoft Base Cryptographic Provider v1.0"
    sp.ProviderType = 1
    
    acad.ActiveDocument.SaveAs "C:\MyDrawing.dwg", , sp
    
End Sub