With DVD playback?

decrypting your DVDs (for your own use) probably isn't illegal in some jurisdictions, so sure,
maybe you're in the clear on that...

However, there have been various patents issued relevant to the codecs used in DVD, including
the video codec from MPEG 2 and some of the choices available for audio, notably MPEG audio
(same as in MP3) and Dolby Digital (aka AC-3)

Is it possible that the stated (but ignored) prohibition on software patents in the EU would
allow a court to overturn these particular patents, or at least find that they can't apply to
Dell's computers which just happen to run this software? Yes, I suppose it might be possible,
if you have very good lawyers and are willing to drag it out for years against a resourceful
and politically powerful enemy...

But there's no reason Dell should go to that expense to help us. It wouldn't make commercial
sense. Better to pay the ransom.