For child porn it is still grounds for a search warrant. Which they'll execute and return your stuff after not finding anything (six months later minimum). Not

For child porn it is still grounds for a search warrant. Which they'll execute and return your stuff after not finding anything (six months later minimum). Notice and notice is about copyright infringement only. It's just a pretty toothless way to intimidate. If they were actually going to do something then they would use notice and notice to serve you a summons to court. In that case it's either small claims, where you don't need a lawyer and the judge will help you if the other side uses one, or it's full court where the loser pays the all the winner's costs. So as long as you're on the right side of the law, it actually doesn't cost anything if you get sued (no filing fees as the defendant). Whether or not you're actually liable in this situation is going to have to be answered by a real lawyer.