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About: Spiradisc     Goto   Sponge   NotDistinct   Permalink

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Spiradisc (often misspelled as "Spiradisk") was a copy protection scheme used by Sierra On-Line on their floppy disk releases for the Apple II.The technique, developed by , involved writing the data on spiralling paths on the disk rather than in concentric circles. Initially, no commercial copying software or bit nibbler could successfully copy the disks it was applied to. Games which used Spiradisc copy protection include Lunar Leepers, Frogger, Ultima II, Star Maze, Jawbreaker, and . Eventually, Copy II Plus version 5 was able to successfully defeat this copy protection.