That is actually illegal in Finland because it's illegal to circumvent the copy protection. Technically you need a licensed player. A few people have turned themselves in for watching a DVD on Linux and they received a token fine.
It's hard to find working links for old stuff (this was in ~2007), but...
The law made "organized discussion" about breaking copy protection illegal so they also created a website with the title "organized discussion" and displayed code for breaking the protection and someone also paid 5 cents for it after which they turned themselves in :)
Apparently the lower courts acquitted them but that was reversed and the supreme court didn't take the case. So the end result is that it's illegal but they didn't receive any penalties. Apparently the European court of human rights didn't accept the case either.
