About: Key2Audio

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key2audio is a copy restriction system for Audio CDs, developed by Sony DADC. The system gained notoriety after it was discovered that one can effectively disable the system by tracing the outer edge of a CD with a felt-tip marker. Currently there are two major versions of the key2Audio protection: the original key2Audio, and key2AudioXS.

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  • key2audio is a copy restriction system for Audio CDs, developed by Sony DADC. The system gained notoriety after it was discovered that one can effectively disable the system by tracing the outer edge of a CD with a felt-tip marker. The system works by applying a bogus data track onto the disc during glass master manufacturing. Since computers are designed to read data before music, this prevents playback on a PC and thereby prevents ripping as well as ordinary listening using a computer. CD players ignore any non-audio tracks on a disc, and can therefore play the CD unimpeded - Enhanced CDs also take advantage of this factor. Currently there are two major versions of the key2Audio protection: the original key2Audio, and key2AudioXS. (en)
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  • key2audio is a copy restriction system for Audio CDs, developed by Sony DADC. The system gained notoriety after it was discovered that one can effectively disable the system by tracing the outer edge of a CD with a felt-tip marker. Currently there are two major versions of the key2Audio protection: the original key2Audio, and key2AudioXS. (en)
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  • Key2Audio (en)
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