The code name for SafeAudio, yet another annoying technology brought to you by Macrovision that "protects" consumers' (the RIAA's) interests by preventing piracy (and "unfortunatly" fair use as well): the digital copying of CD Audio.
The practical upshot of all this is that your music will now have "barely perceptable" clicks and pops throughout that your HiFi will ignore, but your computer will complain about.
There are fears that some older HiFi equipment could be damaged by the noise inserted into the CD tracks; this could prove very amusing, especially in places where CD copying is legal.