Re: Costs
Depends on the judge.
The judge has the ability to make either side pay some or all of the legal costs of the other. If they think it's frivolous or vexatious then they'll tell the plaintiff to pay the defendants' costs.
This is the main reason most patent troll cases never go to court. The "licence" fee is often slightly lower than the legal costs to defend the case and annul the patent would have been.
Strange that.