MP3s

I just got asked to go to the sysadmin's office - which is always ominous - and was asked why I'd put 200 megs of mp3s on the network. They'd been copies of some my car CDs I'd made using Realplayer and backed up on the network as my HD is due to be formatted. So I wasn't in bother fortunately, but I guess I need to get to speed on what and what not to do in this job of mine.