Sailing is one of those endeavors that really make you respect the ancestors. As a kid (and indeed, a thirty-something) it seemed like a simple matter or pointing a sheet in the wind to go forward. Then you actually go on one of these crazy things and -- even setting aside the knots -- there's this mad calculus that goes into what turns where when that somehow makes you best off when you're perpendicular to the actual wind. Real witchcraft.

This, of course, brings us to one of my favorite areas of patent law, the safe harbor provision. For those, less familiar, Judge Barker's opinion this week in Merus N.V. v. Xencor, Inc., C.A. No. …