Mac users may want to check the labels on their music CDs twice, as copy-protected audio discs flooding the market may lead to serious problems when they are played on some computer systems.

Unlike standard audio CDs, copy-protected audio discs embed software that seeks to block certain uses of songs, for example, preventing consumers from copying the tracks onto a hard drive. Sony, whose Epic label published Dion’s “A New Day has Come,” has included a warning telling customers that the disc is not compatible with Macs or PCs.

When are these companies going to learn that the best thing to do is to stick to the industry accepted standards.