In November 2005, it was revealed that Sony BMG was distributing albums with Extended Copy Protection or XCP, a controversial feature that automatically installed rootkit software on any Microsoft Windows machine upon insertion of the disc. In addition to preventing the CD's contents from being copied, it was also revealed that the software reported the users' listening habits back to Sony and also exposed the computer to malicious attacks that exploited insecure features of the rootkit software. Though Sony refused to release a list of the affected CDs, the Electronic Frontier Foundation identified "12 Songs" as one of the discs with the invasive software.