If you are looking for an updated version of DCPcrypt try either

I’ve not tried either of them (and I’m told they are quite different to each other – no idea which is closest to the original)!

DCPcrypt has finally been retired (except for the versions above). I’ve been developing it since 1999 and it since 2007 (or so) it has been developing code rot. It was good while it worked but now there has come a point where I can’t guarantee that it will work correctly (or securely) under recent versions of Delphi.

For the curious, the code is still available below. However, I don’t recommend anyone to use it any more.