22 Year old, Jon Lech Johansen who previously hacked DVD encryption in his teens has now hacked through the iPod copy protection. This copy protection stops iPod users from playing downloaded music from online music stores other than iTunes. This "copy protection" also stops music that has been bought off iTunes from being played on other devices (apart from the iPod).
His company now plan to license the code to businesses who can use it to make Apples downloadable music play on their devices and to allow themselves to sell downloadable music that will play on the ipod.
So the kid who became famous as DVD Jon in his teens is now famous again for cracking open Apple's copy protection.