This case is ancillary to the “Underlying Lawsuit,” 1 in which the SEC contends that a number of business enterprises controlled and operated an illegal Ponzi scheme. At the SEC’s request, the district court appointed Lawrence Warfield as Receiver for the business entities, including Resource Development International, LLC (“RDI”). The court ordered Warfield to collect, receive, and take exclusive custody, control, and possession of the defendants’ assets in the Underlying Lawsuit.

As part of his investigation into the Underlying Lawsuit, the Receiver discovered that Kirk Edwards, Larry Edwards, Robert Edwards, Sherry Edwards, Roger Hetchler, Sharyn Meenderinck, Jim Smith, and Kathy Thaut (collectively, the “Edwards Defendants”) either participated actively in facilitating investments in the scheme or received assets belonging to the defrauded investors without exchanging any value. The Receiver then filed the instant case against the Edwards Defendants.

The district court granted the Receiver’s motion for partial summary judgment against the Edwards Defendants and entered a final judgment. The Edwards Defendants filed a motion under rule 60(b)(4) of the Federal Rules of Civil Procedure. This appeal ensued after the district court had denied the motion.

I.

The Edwards Defendants do not dispute their involvement in the Ponzi scheme. Proceeding pro se, they present a lengthy argument that is completely devoid of merit. They contend that district courts of the United States (“DCUS”) are the only federal courts with jurisdiction to hear claims arising under the Securities Act of 1933 2 (“Securities Act”) and the Securities Exchange Act of 1934 3 (“Exchange Act”). DCUS are courts vested with article III judicial power. The Edwards Defendants contend that the portions of the Act of June 25, 1948, codified at 28 U.S.C. § 1 et seq., create the mistaken impression that DCUS are synonymous with United States District Courts (“USDC”).

The argument continues as follows: Congress promulgated title 28 ostensibly to allow all prior violations of federal law to be prosecuted in USDC, which are not, the Edwards Defendants argue, article III tribunals (but DCUS are). For want of jurisdiction, therefore, claims arising under the Securities and Exchange Acts may not constitutionally proceed in USDC. Finally, according to this tortured reasoning, we would lack jurisdiction, under 28 U.S.C. § 1291, to entertain appellate review of all USDC decisions within the Fifth Circuit (but we would retain jurisdiction over DCUS decisions).

Ordinarily, we will not consider arguments that were not presented to the district court. 4 Where the argument involves subject matter jurisdiction, however, waiver does not preclude us from considering the matter on appeal. 5 We deem the Ed *654 wards Defendants’ argument without merit, and we decline to invalidate much of the last sixty years of securities litigation because the “D’s” and “C’s” are capitalized differently in different statutes. Both original jurisdiction and appellate jurisdiction are properly exercised in this case.

II.

The Edwards Defendants argue that “there were multiple flaws in the institution of the underlying prosecution by the administrative agency, due process [sic], which is a necessary element of subject matter jurisdiction [sic]; and subsequent orders and complaint of [Warfield], which rendered them [sic] defective.” They contend specifically that (1) they were not afforded notice and opportunity to be heard at the administrative level; (2) no clerk’s seal was originally placed on the summons as to defendants; (3) the judgments have been obtained by jurisdiction-ally fatal fraud; and (4) the absence of final judgments in the Underlying Lawsuit nullifies the district court’s subject matter jurisdiction. These points are without merit.

At the outset it is worth noting two things. First, the Edwards Defendants lack standing to raise many of the following claims stemming from the Underlying Lawsuit, because none of these arguments relates to the district court’s subject matter jurisdiction over the SEC’s' complaint. 6 Second, the dominant theme of the Edwards Defendants’ opening brief is its improper attempt to cast a variety of procedural irregularities and substantive legal disagreements as defects in subject matter jurisdiction. Rule 60(b)(4) is the vehicle for this chicanery: “On motion and upon such terms as are just, the court may relieve a party or a party’s legal representative from a final judgment, order, or proceeding [because] the judgment is void.”

A.

We review the district court’s decision on a Rule 60(b)(4) motion de novo. See Carter v. Fenner, 136 F.3d 1000, 1005 (1998). Where the motion is based on a void judgment under rule 60(b)(4), the district court has no discretion; the judgment is either void or it is not. See Recreational Props., Inc. v. Southwest Mortg. Serv. Corp., 804 F.2d 311, 313-14 (5th Cir. 1986). As we explain below, however, we do not apply a strict de novo review to every procedural irregularity. 7

B.

The Edwards Defendants attack the Receivership Order because the SEC allegedly failed to comply with 5 U.S.C. § 557(c), a provision of the Administrative Procedure Act (“APA”). This argument is frivolous, because the APA’s notice and hearing requirements do not apply to trial de novo in court. 8 The SEC initiated the relevant legal action; it did not adjudicate it (nor did it conduct a hearing of the sort the APA contemplates).

C.

The Edwards Defendants contend that the SEC Complaint failed to invoke the district court’s subject matter jurisdiction because the complaint lacked the court *655 clerk’s seal. They further argue that the absence of such a seal invalidates the district court’s in personam jurisdiction because copies mailed between districts could not bear that seal. Finally, they aver that the seal’s absence from the summons invalidates the district court’s in personam jurisdiction.

The claim that 28 U.S.C. § 1691, through its reference to “process,” contemplates a complaint is incorrect. 9 Moreover, the Receiver properly secured the clerk’s signature and seal for certified copies of the Complaint and Receivership Order (“Order”) in both the Eastern and Western Districts of Washington. In each case then, the clerk signed and sealed the documents.

The Northern District of Texas uses an embossed seal on photocopying, meaning that the absence of a visible seal on a photocopy does not demonstrate that a seal was not on the original. Moreover, each summons was undeniably signed by the clerk. The presence or absence of the clerk’s signature on the summons may or may not be disputable, but this is of no moment, for such defects are not fatal if they do not prejudice the defendant. 10 In the instant case, they do not. 11 For many *656 of the same reasons, we reject the argument that the absence of the seal on certified copies of the Order nullifies the district court’s jurisdiction. 12

D.

The ■ Edwards Defendants argued in their rule 60(b)(4) motions that the Receiver’s failure to identify all Receivership Assets 13 within thirty days of his appointment, and to submit to the district court a report about those assets, created a jurisdictional defect voiding the Receiver’s appointment. The Edwards Defendants cite no authority on this issue, but only cross-reference the record). -

The Receivership Order, issued in March 2002, states:

The Receiver is hereby directed to file with this Court and serve upon the parties, within 30 days after this Order, a preliminary report setting out the identity, location and value of the Receivership Assets, and any liabilities pertaining thereto. Further, ... he shall recommend ... whether ... claims against [various defendants] should be adjudged in the Bankruptcy Court.

The Order clearly contemplates a preliminary report sufficient to give guidance as to the appropriate forum in which to pursue certain claims arising from the Ponzi scheme. The Receiver satisfied this burden. Moreover, there is no cited authority for the proposition that a failure to meet the terms of the order would create a jurisdictional defect.

E.

Finally, the Edwards Defendants urge that, because no final judgments have been entered in the Underlying Lawsuit, the Receiver’s authority to seize assets cannot “relate back” to the authority derived from the Underlying Lawsuit. 14 The Edwards Defendants cite no authority and make no argument for how the “relation back doctrine” should apply here.

Divining the Edwards Defendants’ precise legal theory on this issue is unnecessary, because the assumption that there have been no final judgments in the Underlying Lawsuit is incorrect. Permanent Injunctive relief has issued against every defendant in the Underlying Lawsuit except William Whalen. The Interlocutory Default Judgment entered against these *657 defendants leaves only the amount of disgorgement against each defendant for final determination. The Edwards Defendants’ argument that the resolution to the Underlying Lawsuit somehow violated due process is pure speculation and, even if it did violate due process, it would not bear on the subject matter jurisdiction in this case.

F.

The Edwards Defendants advance several other theories in their pro se briefs. 15 Although the arguments discussed in the previous subsections are confused and poorly supported, these other issues, as briefed, are utterly unintelligible. We consider them waived for inadequate briefing. 16

AFFIRMED.