Tip-off #1: on the front of the CD, at the left-most edge, in the transparent "spine", you'll see "CONTENT PROTECTED" along with the IFPI copy-protection logo. A few photos make this clearer.
Tip-off #2: on the back of the CD, on the bottom or right side, there will be a "Compatible with" disclosure box. Along with compatibility information, the box also includes a URL where you can get help. The URL has a telltale admission buried in it: cp.sonybmg.com/xcp. That lets you know that XCP is on this disc (discs protected with SunnComm have a different URL that includes "sunncomm").
SunnComm MediaMax software:
» List of CDs affected and possibly
affected by MediaMax
Compact Discs with the SunnComm MediaMax software are harder to spot, but can be identified by a wide variety of means. See our Slideshow. Most commonly, you will see a "Compatible with" disclosure box on the bottom of the back of the CD (see images below). From what we have seen so far, only discs with MediaMax version 5 have this disclosure box. Along with compatibility information, the box also includes a URL where you can get help. The wording
"? www.sunncomm.com/support/sonybmg; README.HTML"
lets you know that SunnComm MediaMax is on this disc.
However, a number of SunnComm MediaMax CDs use different methods notably stickers on the front and, less helpfully, fine print on the back. These are generally MediaMax version 3, but at least one, "Defined" by Amici Forever, contains SunnComm MediaMax Version 5 and the URL but does not have the black and white "Compatible with" table noted above.