CS-DNA, i think the main issue here is that of being able to copy DVDs. DVDs that are produced commercially are typically dual layer which means they can hold abotu 10GB of information. DVD-Rs by contrast don't have that dual layer ability and therefore only have half the capacity (about 4.3GB from memory). For this reason you can't copy a DVD just by renting a movie, downloading the disk onto your hard drive and reburning it onto a DVD-R because it just won't fit. The DVD has to have its quality slightly reduced and has to be compressed down to 4.3GB. The problem is that the encrypted DVD cannot be compressed. This piece of software effectively allows you to decrypt the DVD data and compress it so that it can be burned onto a DVD-R and therefore we have piracy.