Recently, Sony was discovered to have been installing software on people's computers without the user knowing it. When a user inserted a Sony CD into their computer CD-ROM drive, a "root kit" was installed that enabled the music giant to install "copy protection" without the user knowing.
Some spyware developers and trojan horse virus makers have already begun to make use of Sony's root kit to hide their presence on the user's machine.
Some users of argued that this plays right into the hands of pirates. This issue was discussed last week on PowerUser.TV at length. Why be legitimate in acquiring music if you're going to be treated like a criminal when it's so much easier to simply warez it was what many have said on-line.
CNET has an excellent follow-up on the situation. Check it out.