Copyright Protection of Floppy Disks
Original Publication Date: 1985-Jul-01
Included in the Prior Art Database: 2005-Feb-18
This article describes a copyright protection technique which allows any number of backup copies to be made of a program stored on a master diskette. The backup copies can be used, however, only to restore the program to the master diskette. The master diskette will have a protect track in which some or all of the oxide material has been removed. At certain critical steps, the stored program will attempt to write the series of "1's" to the protect track. At other points in the program, attempts will be made to read the protect track to see if "1's" can be detected. If "1's" are detected, indicating that the program is being executed on a diskette other than the master diskette, the program operation will abort.