Rightly said, Bobblick. Entering extra code into software to do copy protection isn't hard, but it isn't foolproof to work, either. You just have to take that chance, unless you are making some type of software that is worth hundreds, a "dongle" is going to make people more reluctant to buy your software. Bob Blick wrote: > At 11:27 AM 7/19/98 -0400, you wrote: > >Does anyone know how to add software copy protection in DOS and/or Windows? > > Does anyone know how to increase the unit cost of a software product, while > at the same time frustrating legitimate users, reducing sales, and creating > incompatibility with laptops? > > -Bob > > http://www.bobblick.com/ -- <-------------------------------------------------------> < Martin Klingensmith, AKA Format. > < Pyrotechnics - Mountain Bikes - Electronics - Coding > < Aquaria - Computers - Computer Selling - And the list > < Keeps going, and going... > <------------------------------------------------------->