A comparative survey of aspects of the subsistence of copyright in computer software
Coenraad Visser · Comparative and International Law Journal of Southern Africa · 1984
Although the article deals only with the subsistence of copyright in computer software, it should be noted that an important distinction relating to hardware devices is drawn between an analog device, which is a computer wired permanently to perform a specific set of calculations or measurements, and a digital device, which can be varied in its method of application, depending upon how it is programmed. The focus of the article is on digital computers, since the logical operations performed by them can be changed by the use of different programs.