SUMMARY ORDER

Defendant-appellant Feng Tao appeals from an order of the District Court (Bro-derick, J.) granting in part a motion by Advanced Access Content System Licensing Administrator, LLC (“AACS LA”) to amend a preliminary injunction and denying Tao’s motions to amend the injunction and vacate the entry of default. We assume the parties’ familiarity with the facts and record of the prior proceedings, to which we refer only as necessary to explain our decision to affirm.

Tao principally challenges the amended preliminary injunction, arguing first that AACS LA failed to demonstrate irreparable harm, and second that the injunction was unlawful insofar as it applied extrater-ritorially and enjoined foreign third parties.

The District Court acted within its discretion in finding that AACS LA would *662suffer irreparable harm absent the amended preliminary injunction. Relying on sworn declarations, the District Court found that Tao’s software allowed users to circumvent AACS LA’s encryption technology and thereby undermined AACS LA’s business model. Further, Tao’s conduct indicated a strong likelihood of future violations. We perceive no error in these findings, which were sufficient to justify the amended injunction. See WPIX, Inc. v. ivi, Inc., 691 F.3d 275, 285 (2d Cir. 2012); Kapps v. Wing, 404 F.3d 105, 123 (2d Cir. 2005).

Nor does the amended injunction reach impermissibly beyond the United States. The injunction does bind certain foreign third-party registries and payment processors who receive actual notice of the injunction. But the injunction merely notifies these parties that they “could become liable through Rule 65 if they assist [the defendant] in violating the district court’s orders.” NML Capital, Ltd. v. Republic of Argentina, 727 F.3d 230, 243 (2d Cir. 2013). “[F]ederal courts can enjoin conduct that ‘has or is intended to have a substantial effect within the United States.’ ” Id. (quoting United States v. Davis, 767 F.2d 1025, 1036 (2d Cir. 1985)). The District Court provided enough reasons why the injunction must reach the “process” through which Tao distributes his software, see id. at 244, as Tao continued to rely on foreign third parties to facilitate access to the United States market even after the original injunction issued.

Tao also asks that we vacate the preliminary injunction and entry of default on the ground that service was improper. Tao has arguably forfeited this argument before the District Court. See Datskow v. Teledyne, Inc., Cont’l Prods. Div., 899 F.2d 1298, 1303 (2d Cir. 1990). In any event, this fact-intensive challenge — which was never litigated, but still could be raised, below1 —is not properly before us and we decline to consider it on appeal in the first instance. See Harrison v. Republic of Sudan, 838 F.3d 86, 96 (2d Cir. 2016).

We have considered the remaining arguments and conclude that they are without merit. For the foregoing reasons, the order of the District Court is AFFIRMED.