Tim Challies has an excellent post on copyright and mp3 and software. Go read it.
As it gets easier and easier to copy music and swap files, Christians need to realise that if you haven't paid for it, and don't have permission to give it away then to do so is stealing.
How many people's hard-drives/mp3 players are filled with music they didn't pay for?
I remember talking to a Christian young person who proudly told me that he downloaded all his software from the internet and bypassed the security with cracks. He then offered to get me the latest desktop publishing software.
It's called stealing, and God forbids it.
Its easy to do. And we can excuse it so easily. I sometimes borrow a cd and rip it to my ipod to listen to and see if I want to buy it. But months later it can still be there. It's time to dump or buy.
So if you need to, repent and clean out your hard-drives.