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CD-Cops

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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 90's by Lotus 1-2-3. As a copy (CD-R or CD-ROM) will have a different geometry, it has not yet been possible to create reliably working 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 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 so much for games.

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

It is closely related to StarForce.

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