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You should check a current date with date, which is limit to executing of your application. Check this condition in your *.dpr file.

uses
  SysUtils, Dialogs;
...
begin
  if Date<EncodeDate(2003,3,9) then
  begin
    Application.Initialize;
    Application.CreateForm(TForm1, Form1);
  Application.Run;
  end
  else
    ShowMessage('The available period of
      this application has already finished');
end.

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