Cactus Data Shield 200

[Mac@Melmac]

I made a backup from a Cactus Data Shield 200 protected disc. After 9 sec on each song there is a click! My carstereo hangs on those clicks in some songs, but the CD player at home works.
The strange thing is when I play it in my PC, the player on he CD comes up, and no clicks are heard.

Sinice the copy-protection obviously does something with the audio, there must be a lower quality on the CD compatred to one withoy a protection. I don't get it! How does it work? How can it be clicks when I made a 1:1 copy?