extern "C" __declspec( dllimport ) __stdcall BOOL EP_CheckupIsProtected();

function EP_CheckupIsProtected : boolean;

Public Declare Function EP_CheckupIsProtected Lib "enigma_ide.dll" () As Byte

public class Enigma_IDE
{
    [DllImport("enigma_ide.dll", CallingConvention = CallingConvention.StdCall)]
    public static extern bool EP_CheckupIsProtected();
}

uses 
  enigma_ide; // the module contains a definitions of Enigma API

// Check, if the file is protected
if EP_CheckupIsProtected then
begin
  MessageBox(0, 'We are under protection!', 'Application', MB_OK or MB_ICONINFORMATION);
end else
begin
  MessageBox(0, 'Please protect this file before usage!', 'Application', MB_OK or MB_ICONERROR);
end;