Help Signing ActiveX app

hi
can anyone give me tips on how to digitally sign a activex application
developed in delphi so that can be downloaded in IE4 without needing to set
the security level of the browser down.
please mail me any tips to
elri...@iscorvdb.co.za

ps. i'm preferrably looking for a solution applicable to our intranet that
doesnt use licensing or any other expenses.