bots' For Sony Cd Software Spotted Online Sony's software, installed when playing one of the record label's recent copy-protected CDs in a computer, hides itself on hard drives using a powerful programming tool called a "rootkit." But the tool leaves the door open behind it, allowing other software--including viruses--to be deeply hidden behind the rootkit cloak. The first version of a Trojan horse spotted early Thursday, which aims to give an attacker complete remote control over an infected computer, didn't work well. But over the course of the day, several others emerged that apparently fixed early flaws. This is no longer a theoretical vulnerability; it is a real vulnerability," said Sam Curry, vice president of Computer Associates' eTrust Security Management division. "This is no longer about digital rights management or content protection, this is about people having their PCs taken over." Sony's use of the rootkit software has spa