Even though it's true that Johansen took part in developing DeCSS, he had nothing at all to do with cracking the CSS code, which makes the already weak case against him even weaker.
Just to refresh our memory, here's a quote from a three-year-old article written by deZZY/DoD about DeCSS and cracking the CSS code.
Lately, Jon Johansen of MoRE has been pretty much all over the news in Norway, though he had NOTHING to do with the actual cracking of the DVD CSS protection. Yes, it was MoRE who did DeCSS, but the actual crack was not a team effort, MoRE didn't even exist back when the anonymous German (who is now a MoRE member) cracked it...
The trial is due to last five days.
Source:
Yahoo! News