The following compact discs, sold by Sony BMG, were shipped with the computer software known as Extended Copy Protection (XCP). As a result, any Microsoft Windows computer that has been used to play these CDs is likely to have had XCP installed. This can cause a number of serious security problems. Several security software vendors, including Microsoft, regard XCP as a trojan horse, spyware, or rootkit. Mac OS X systems which were used to play these CDs may have been affected with a similar program, MediaMax.