Software Protection by Decryption on Multi-Usage Serial Interface
Original Publication Date: 1986-Oct-01
Included in the Prior Art Database: 2005-Mar-09
This article describes an arrangement for decrypting and protecting software without using precious system option slots. This is accomplished by using an existing serial keyboard port. Software copy protection is a necessary technique used to protect the development investment made by software vendors. The diskette- based protection schemes in use are being defeated by easy to use bit copy tools. It has become apparent that a new encryption/decryption technique based on hardware is needed in order to protect the software better. The technique described herein is a unique low-cost hardware method of attaching decryption hardware to a personal computer. This hardware is referred to as a lock. The lock is a hardware addition to a personal computer (PC) which will protect software from being used without authorization.