>Music disc copyright protection schemes such a Cactus Data Shield 100/200
>and KeyAudio can be circumvented using tools as basic as marker pens and
>electrical tape, crackers have discovered.

>The Blue Peter-style hack, which was first unearthed by a reader of
>chip.de works by covering up the outer ring of a copyright protected
audio disc.

>On copy protected discs this outer track is corrupted, which prevents
>copying, or even playback, by PCs but is ignored (at least in theory) by
>regular CD players.

>Simply covering up the outer track disables the protection, allowing a
>disc to be played as normal in a PC or Mac.