There are CDs which won't play on my 598 because they're not really CDs. I was mis-sold and lied to because they were in the CD section of the shop. Apparently this is to stop people copying them to a hard disc. The irony is that to get the bloody thing to play, you HAVE to make a copy of it to CD-R. What's even more amazing is that the 'protection' appears to do nothing to make the copy harder to perform. Not one extra key press; nothing. Their protection forces users to copy the CD they paid for, just to be able to hear it, and doesn't even hinder them when they do.
I second VK's religous undertones.
Whilst I do not own many (I can only name one - the Dido 'CD') copy protected CD's, my Meridian kit does not have an issue with any of them.