Wait, arrested?
You can get arrested for this in the USA?
I know that it's only a civil matter here, and the criminal code doesn't say anything about it.
Copyright infringement can get you sued, but it's not an offence, or at least so I thought.
Software patents is just a ridiculous idea. Software licensing can be equally as retarded. If it's illegal to play a dvd movie with whatever media player you want implementing it's own way to decrypt CSS then it's illegal because it wasn't licensed by the people who license stuff like powerdvd for legal dvd movie playability.
This is one of the reasons why linux doesn't include any codecs for anything other than opensource codecs like ogg/vorbis. For years the only way to play a dvd was with libdvdcss (you can guess unlicensed, it's also part of vlc), and to get codecs for divx, mp4, mp3, xvid (you can probably also guess unlicensed) and so on was through a similar way. The only reason windows plays mp3's right off the bat is because microsoft has a license for mp3.
Idk about arrested per se, but i do know that at least get sued for having pirated stuff and get a massive fine. Ideally when i have to play a dvd in linux i just install the ****ing codecs and libdvdcss and just don't worry about it. Having an illegal codec is different than having pirated works, but you get the idea, it's an offense. Screw software patents, **** DMCA, the MPAA, the RIAA, and so on.