CD-Cops

CD-Cops is the first CD-ROM protection that uses the geometry of the CD-ROM media rather than a hidden "mark". It was invented in 1996 by Danish Link Data Security, known for its Cops Copylock key-diskette security used in the 1990s by Lotus 1-2-3.

Overview

As a copy (CD-R or CD-ROM) will have a different geometry, Data Position Measurement needs to be used for copies. The geometry is not known before CDs have been produced, therefore a CD-code expressing the layout of the CD-ROM must be entered the first time a user runs the protected software. Using a special production process in some cases the CD-code is embedded on the CD-ROM. CD-Cops is popular for encyclopaedias/dictionaries and business applications but not used as much for games.

DVD-Cops based on the same principles in 1998 was the first DVD-ROM protection made.

gollark: Wait a minute, why does my Egg Drop Soup scroll banner show 1 frozen, 1 hidden?
gollark: DC is made of numbers, in the purely useless sense.
gollark: Basicallyscore = views + unique views * 6 + clicks * 12if hatchling, optimal score is 13000 at 4d and 5000 at 7d (between the two extremes, it's averaged)if egg, optimal score is 5000 at 4d and 0 at 7d (averaged again)it's safeish if the score is less than 1.5x the optimal score.
gollark: ```javascriptfunction getScore(dragon) { return dragon.views + (dragon.uniqueViews * 6) + (dragon.clicks * 12);}const nextStageAge = 72;const maxTime = 168;function getOptimalScore(dragon) { const time = dragon.hoursRemaining; const age = maxTime - time; if (dragon.type == "hatchling") { return 5000 + (8000 * (age / nextStageAge)); } else { return 5000 * (age / nextStageAge); }}function getScoreRatio(dragon) { return getScore(dragon) / getOptimalScore(dragon);}function isSafe(dragon) { return getScoreRatio(dragon) < 1.5;}```
gollark: I guess that since I'm banned anyway I might as well show my modified EATW formula...

References

    Sources
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