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Spiradisc 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 Mark Duchaineau, 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 ''Maze Craze Construction Set''. ==References== 〔
抄文引用元・出典: フリー百科事典『 ウィキペディア(Wikipedia)』 ■ウィキペディアで「Spiradisc」の詳細全文を読む
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