:25 Arguments for the Elimination of Copy Protection
25 Arguments for the Elimination of Copy Protection Oct 21, 2008, 13 :02 UTC (1 Talkback[s]) (5723 reads) (Other stories by Harry McCracken)
"25. Lenslok. And all its spiritual descendants. Which are many and varied.
"I managed somehow to avoid Lenslok back in its heyday in the mid-1980s, but just reading about it makes me gnash my teeth, It was an oddball prism-based gadget invented in the mid 1980s to copy-protect games on the Atari 400/800, Commodore 64, Sinclair ZX Spectrum, and other pioneering home computers. You held the Lenslok up to your PC’s display to read a secret code that let you unlock a game. But “[in] order for the Lenslok to work correctly the displayed image has to be the correct size,” says Wikipedia. “This meant that before each use the software needed to be calibrated to take account of the size of the display."
