Issue No. 05 - September/October (1986 vol. 3)
P.A. Suhler , University of Texas at Austin
For every piece of business software sold, at least one illegal copy exists. This article describes and classifies software-protection methods.
M. Malek, N. Bagherzadeh, N. Iscoe and P. Suhler, "Software Authorization Systems," in IEEE Software, vol. 3, no. , pp. 34-41, 1986.