"Ripping" your own CDs has never been legal in the UK, and downloading copyrighted material is most definitely a crime regardless of whether you "own" the CD or not. This is like the very silly argument some people make saying that it's "OK" to download an illegal eBook simply because you've bought the paperback.
I'm 110% on Sony's side in this. These "filesharing" criminals need to be taught a lesson. The RIAA are most definitely the "good guys" here.