Under Fed. R. Civ. P. 4(k)(2), the federal courts could properly exercise personal jurisdiction over Czech companies that hosted child porn videos in violaiton of federal criminal statutes that gave the porn victims private rights of action against those profiting from the child porn.  Under the Calder test, there was sufficient evidence that the companies targeted the US and profited from doing so.  The companies hired US-based content delivery networks to temporarily download the porn videos to US-based servers to reduce delays in transmission to US viewers providing an uninterrupted viewing experience.  US viewers of the porn videos accounted for between 12 and 19% of the revenues defendants received form peddling the porn.  Plaintiff’s claims arose directly from the defendants’ exhibition of the porn videos to US audiences.