Fifth Circuit blocks Motorola’s U.S. discovery route in European 5G patent fight

The story

A U.S. appeals court has blocked Motorola from using American discovery to obtain a patent purchase agreement for litigation already underway in Europe. In a published October 29 opinion, the Fifth Circuit reversed a Texas federal-court order that required Advanced Standard Communication, or ASC, to produce its unredacted agreement for a portfolio acquired from ZTE. The decision is immediately important to parties coordinating patent cases across the United States, the European Union’s Unified Patent Court and national courts.

The underlying dispute concerns three telecommunications patents that ASC says cover technology used in Motorola’s 5G-capable devices. ASC bought a bundle of patents from ZTE at the end of 2022, and the companies later failed to agree on licences. ASC sued Motorola entities in the UPC and Munich District Court I in 2025. Motorola denies infringement and argues in the alternative that any standard-essential rights must be licensed on fair, reasonable and non-discriminatory terms, commonly called FRAND.

Motorola believed the purchase agreement could reveal information relevant to that defence. A public, redacted version referred to licences in an omitted exhibit, and Motorola argued that the complete agreement might help establish the patents’ market value or test whether ASC’s proposed royalties were reasonable. It asked the UPC for production. The UPC denied the request in April 2026, finding that Motorola had not shown the material was necessary or relevant at that stage, while expressly leaving open a later request.

Motorola also turned to a U.S. statute, 28 U.S.C. Section 1782, which permits federal courts to order evidence from a person or company found in their district for use in a foreign proceeding. ASC is headquartered in Garland, Texas, so Motorola applied in the Northern District of Texas. A magistrate judge ordered production, and the district judge upheld that order using the deferential clear-error standard. That created a direct procedural conflict: the UPC had declined to require the document, while the U.S. court ordered it produced.

The Fifth Circuit found two legal errors. First, it held that a Section 1782 application is a stand-alone case whose object is the discovery itself. A magistrate judge may therefore issue a recommendation, but a district judge must review properly disputed issues from the beginning rather than asking only whether the magistrate clearly erred. The published ruling resolves uncertainty among district courts within the Fifth Circuit, which includes Texas, Louisiana and Mississippi.

Second, the panel rejected the lower court’s demand that ASC supply ‘authoritative proof’ that the European courts would refuse the evidence. The appeals court said that demanding standard applies in a different context involving foreign-law privilege, not generally to whether a foreign tribunal would welcome U.S.-ordered discovery. Reweighing the factors established by the U.S. Supreme Court’s Intel decision, the panel concluded that the balance favored ASC at the present stage.

Timing was decisive. ASC is already a party before the European courts, which can order it to produce evidence themselves. The UPC had considered the same agreement and found the request premature, and both sides’ German-law experts indicated that the Munich court would probably take a similar approach. The panel said Motorola appeared to be seeking an end run around the UPC’s decision. Ordering production then could undermine comity and encourage forum shopping, even though producing one agreement would not itself be especially burdensome.

The decision is narrower than a ban on American assistance in foreign patent cases. Section 1782 does not require evidence to be discoverable under foreign rules, and parties do not have to exhaust every foreign procedure before applying in the United States. The Fifth Circuit also emphasized that Motorola may return if circumstances change. If the UPC or German court later reaches the licensing stage and still cannot obtain evidence that has become material, a renewed U.S. application could present a stronger case.

Nor did the panel decide whether ASC’s patents are valid, infringed or standard-essential, whether ASC’s proposed terms comply with FRAND, or whether a patent purchase price is a reliable royalty benchmark. Those questions remain with the European proceedings. The ruling concerns access to evidence and the relationship between courts, not the merits of the 5G patent claims or the eventual licence price.

INNOVOX analysis: global patent enforcement now operates as a connected procedural system. A portfolio owner’s rights and an implementer’s defences may be tested simultaneously in the UPC, national courts and U.S. discovery proceedings, but the forums cannot be treated as independent evidence channels. The Fifth Circuit’s message is that U.S. discovery remains available to support foreign litigation, yet its timing must respect what the foreign court has already decided. For companies buying or enforcing standards-related portfolios, document governance and a single cross-border litigation strategy are becoming as consequential as the patents themselves.

INNOVOX analysis

The practical value of a multinational patent portfolio increasingly depends on procedural coordination across courts, not only on claim scope. The Fifth Circuit treated timing and comity as central controls on U.S. evidence gathering when a foreign tribunal has already considered the same request. That raises the cost of running disconnected discovery strategies in global standard-essential-patent disputes.

What to watch

Watch whether Motorola renews its production request before the UPC or Munich court as the cases move into FRAND issues, and whether other U.S. circuits follow the Fifth Circuit’s treatment of Section 1782 rulings as dispositive. Also watch for any petition for rehearing or Supreme Court review.