Path: utzoo!attcan!utgpu!jarvis.csri.toronto.edu!mailrus!csd4.milw.wisc.edu!bionet!ames!hc!lanl!cmcl2!adm!smoke!gwyn
From: gwyn@smoke.BRL.MIL (Doug Gwyn)
Newsgroups: comp.sys.apple
Subject: Re: Copy Protection Schemes
Message-ID: <10442@smoke.BRL.MIL>
Date: 23 Jun 89 14:47:50 GMT
References: <8906230557.AA22034@crash.cts.com>
Reply-To: gwyn@brl.arpa (Doug Gwyn)
Organization: Ballistic Research Lab (BRL), APG, MD.
Lines: 12

In article <8906230557.AA22034@crash.cts.com> pnet01!pro-simasd!lbotez@nosc.mil writes:
>I would say that one of the best copy protection schemes is the one
>written by John Brooks (formerly from DataSoft) commonly referred to
>as "JohnDos"; found on such games as Alien Mind and Tomahawk.  

And even Alien Mind was eventually cracked by dedicated pirates, a
real tour de force.

Note that such protection schemes preclude installation of software
on hard disks, making backups, etc.  There are major software vendors
who have found other less obnoxious forms of copy protection, and if
you care about customer satisfaction you should consider those instead.