Summary. Gray market goods are genuine products, made by or for the brand owner, that reach a market through channels the brand owner did not authorize. Because the goods are real, the usual trademark claim fails: the first sale doctrine exhausts the owner's rights once it puts the goods into commerce. The exception that swallows a great deal of the rule is the material differences test, under which genuine goods that differ materially from the authorized domestic version are treated as different products and their sale is infringement. This article explains the three structural varieties of gray market trade identified in K Mart Corp. v. Cartier, Inc., the material differences and quality control theories developed in the First, Second, Third, Eleventh, and D.C. Circuits, the customs regime under 19 U.S.C. § 1526 including the Lever rule labeling exception, and the very different exhaustion rules that now govern copyright after Kirtsaeng and patents after Impression Products v. Lexmark. It then turns to what actually works commercially: distribution controls, serialization, product differentiation, warranty policy, and authorized dealer programs, with attention to the antitrust limits on resale price maintenance. It closes with a worked example, a program checklist, an FAQ, and related reading.

A consumer electronics chain finds a broker offering premium headphones at 40 percent below the U.S. distributor price. The units are genuine. They were made in the same factory, on the same line, with the same components, and they carry the same brand. They were manufactured for the European market. The packaging is in German, the charger has a Type F plug, the firmware defaults to European frequency limits, and the warranty card says it is valid only in the EEA.

The chain's buyer asks the only question that matters: can we sell these?

The answer, and it frustrates everyone, is "probably yes, unless the differences matter, and whether they matter is a fact question that has produced fifty years of litigation."

The short answer

  • The first sale doctrine exhausts a trademark owner's rights in a particular genuine article once the owner (or someone with its consent) sells it. A reseller may resell that article and use the mark to describe it. Prestonettes, Inc. v. Coty, 264 U.S. 359 (1924).
  • The controlling exception is material differences. If the gray market article differs materially from the article the U.S. trademark owner authorized for sale here, it is not "genuine" for trademark purposes, and its sale can infringe. The threshold is deliberately low: a difference is material if it is one that consumers would likely consider relevant to a purchasing decision.
  • A related theory is loss of quality control. Where the owner maintains legitimate, substantial, and non-pretextual quality controls that the gray market goods have escaped, courts have found infringement even without a demonstrable physical difference.
  • Customs blocks some, but not all, gray market goods. Under 19 U.S.C. § 1526 and 19 C.F.R. Part 133, CBP will exclude gray market goods where the U.S. mark owner is independent of the foreign source, but the common control exception permits entry where the U.S. and foreign marks are owned by the same entity or are subject to common ownership or control, and the Lever rule permits entry of physically different goods only if they bear a conspicuous label disclosing the difference.
  • Copyright and patent now follow international exhaustion. Kirtsaeng v. John Wiley & Sons, Inc., 568 U.S. 519 (2013), and Impression Products, Inc. v. Lexmark International, Inc., 581 U.S. 360 (2017), largely removed copyright and patent as tools against parallel imports.
  • Contract and channel design do the real work. Most successful gray market programs are commercial, not litigative.

Part I: What the gray market is, and is not

Gray market goods (also called parallel imports) are genuine goods bearing a genuine mark, produced by or under authority of the mark owner, that are sold outside the owner's authorized distribution channel. The classic case is an international diversion: goods made for Country A that end up in Country B. But domestic diversion is just as common. An authorized dealer sells excess inventory to a broker, who sells it to an unauthorized online retailer.

Gray market goods are not counterfeits. Counterfeits bear spurious marks; gray market goods bear the real thing. Confusing the two is the single most common error in brand enforcement, and it is expensive: it forfeits the counterfeiting remedies if the goods turn out to be genuine, and it exposes the brand to a wrongful-seizure or an unfair-competition counterclaim. See Counterfeiting, Seizure Orders, and Schedule A Litigation.

They are also not stolen goods, overruns, seconds, or refurbished goods, each of which has its own analysis.

The K Mart taxonomy

In K Mart Corp. v. Cartier, Inc., 486 U.S. 281 (1988), the Supreme Court reviewed the Customs Service's gray market regulations and, in the process, gave practitioners a durable vocabulary. Three structural cases:

Case 1: The independent U.S. owner. A domestic firm buys the U.S. rights to a foreign mark from an unrelated foreign manufacturer. The manufacturer's goods then arrive in the United States through third parties. The U.S. owner and the foreign source are genuinely different businesses.

Case 2: Common ownership or control. The U.S. and foreign trademark owners are the same entity, or are parent and subsidiary, or are otherwise under common control. A U.S. company's foreign subsidiary makes goods that are then imported.

Case 3: The authorized foreign licensee. The U.S. owner authorizes an independent foreign manufacturer to make and sell goods abroad under the mark, and those goods are imported.

The Court upheld the Customs regulations barring importation in Case 1 and in Case 3 where an unauthorized third party imports, but struck down the portion of the regulation permitting entry in the "authorized use" subcategory of Case 3. Most importantly, the Court left intact the common control exception, meaning that in Case 2, the most common commercial structure, Customs will let the goods in.

That regulatory result explains why brand owners cannot simply rely on the border, and must litigate on material differences instead.

Part II: The first sale doctrine in trademark law

The rule

Once a trademark owner sells a genuine article, its trademark rights in that article are exhausted. The buyer may resell it, advertise it by its brand name, and describe what it is. Justice Holmes said it best in Prestonettes, Inc. v. Coty, 264 U.S. 359, 368 (1924): "When the mark is used in a way that does not deceive the public we see no such sanctity in the word as to prevent its being used to tell the truth. It is not taboo."

This is the doctrine that makes resale markets, secondary markets, and comparative advertising possible. It is also related to, but analytically distinct from, nominative fair use, which lets a party use a mark to refer to the mark owner's goods.

Why gray market goods usually satisfy it

If the goods are genuine and unaltered, and if the reseller does not suggest an affiliation with the brand owner, the ordinary trademark claim fails. The consumer is getting exactly what the mark promises: a product from the brand owner.

That is the whole defense, and it is a good one. It is why the material differences exception had to be developed, and why it is where all the litigation happens.

Part III: The material differences test

The standard

Genuine goods that differ materially from the goods authorized for U.S. sale are not "genuine" for trademark purposes, because the mark no longer accurately represents what the consumer is getting.

Société des Produits Nestlé, S.A. v. Casa Helvetia, Inc., 982 F.2d 633 (1st Cir. 1992), is the canonical statement. Venezuelan-made PERUGINA chocolates were imported into Puerto Rico, where the plaintiff sold Italian-made PERUGINA chocolates. The differences were in composition, quality, packaging, and price. The First Circuit held that the threshold of materiality "must be kept low," because trademark law protects the mark owner's ability to control the quality associated with its mark, and because "any higher threshold would endanger a manufacturer's investment in product goodwill." A difference is material if consumers would "likely consider [it] to be relevant when purchasing a product."

Iberia Foods Corp. v. Romeo, 150 F.3d 298 (3d Cir. 1998), articulates the same standard while emphasizing that the plaintiff bears the burden of showing that its own quality controls are legitimate, substantial, and nonpretextual, and that the gray market goods failed to conform.

Differences courts have found material

The catalogue is long and instructive:

  • Composition and formulation. Different ingredients, different sweeteners, different active concentrations.
  • Size and quantity. Metric versus imperial units, different fill volumes.
  • Language. Labels, instructions, and warnings in another language, particularly where safety information is involved.
  • Regulatory labeling. Missing FDA-required nutrition panels, missing FCC statements, missing UL marks.
  • Warranty and service. A U.S. warranty that does not cover the unit, or a manufacturer service network that will refuse it. This is one of the most frequently litigated differences and often the most persuasive.
  • Registration cards, customer support, and software updates. Exclusion from firmware updates or a support portal is a real difference to a modern consumer.
  • Voltage, plug type, frequency bands. Very persuasive because they bear directly on usability and safety.
  • Packaging and inserts. Absence of a hologram, different box art, missing accessories.
  • Quality control codes. Zino Davidoff SA v. CVS Corp., 571 F.3d 238 (2d Cir. 2009), affirmed a preliminary injunction where the reseller removed unique production codes from fragrance packaging, defeating the brand owner's ability to track and recall product. The Second Circuit held that interference with a legitimate quality control mechanism is itself the harm.
  • Batch code removal generally. Davidoff & Cie, S.A. v. PLD International Corp., 263 F.3d 1297 (11th Cir. 2001), reached a similar result where codes were etched off bottles, and treated the resulting product as materially different.

Differences courts have found immaterial

Not every difference counts. Courts have rejected claims based on trivial packaging variations, cosmetic differences with no consumer significance, and differences the plaintiff itself tolerated in its own authorized channel. The last point is the defense's best theme: a brand owner that sells inconsistent product itself cannot claim that inconsistency is material.

The quality control theory

A related but distinct line of authority holds that a reseller's sale of goods that have escaped the trademark owner's quality controls infringes, even without proof of a physical difference. Warner-Lambert Co. v. Northside Development Corp., 86 F.3d 3 (2d Cir. 1996), sets out the elements: the owner must show (1) it has established legitimate, substantial, and nonpretextual quality control procedures, (2) it abides by those procedures, and (3) the sale of nonconforming goods will diminish the value of the mark.

This theory is powerful for products where freshness, storage, handling, or recall capability matters: pharmaceuticals, cosmetics, food, batteries, and medical devices. It is much weaker for durable goods where a used-in-a-warehouse-for-a-year unit is indistinguishable from a new one.

Proving materiality

The plaintiff's evidence usually consists of:

  • A side-by-side physical comparison, documented and preserved.
  • The written quality control procedures and evidence they are followed.
  • Consumer complaints about the gray market units, which are gold.
  • Warranty denial records.
  • Regulatory or safety differences, with expert support.
  • Occasionally, a survey testing whether the differences matter to purchasers. See Consumer Survey Expert Methodology in Trademark Cases.

The defendant's evidence usually consists of:

  • Proof the goods are genuine.
  • Evidence the plaintiff's own authorized channel contains the same variation.
  • Evidence the quality controls are pretextual, adopted after the dispute began, or unenforced.
  • Disclosure at the point of sale, which can defeat consumer deception.

Disclosure matters. A reseller who prominently discloses that the goods are imported, carry no U.S. manufacturer warranty, and are not sold by an authorized dealer materially improves its position, because it removes the deception the doctrine exists to prevent. It does not always win, but it converts a strong case into a close one.

Part IV: Customs and border enforcement

The statutory and regulatory scheme

19 U.S.C. § 1526(a) prohibits importation of foreign-manufactured merchandise bearing a U.S.-registered trademark owned by a U.S. citizen or corporation, without written consent. 19 C.F.R. Part 133 implements it.

Key provisions:

  • § 133.21 governs restrictions on gray market articles and provides for detention, with notice to the importer and an opportunity to establish that an exception applies.
  • § 133.23 defines "restricted gray market articles" and codifies the exceptions.

The common control exception. Where the U.S. and foreign trademarks are owned by the same person, or by parties subject to common ownership or control, CBP will not exclude the goods. 19 C.F.R. § 133.23(d). This exception, upheld in K Mart, is why most multinational brands get no border relief.

The authorized use exception applies where the foreign manufacturer applied the mark under authority of the U.S. owner, subject to the limits K Mart imposed.

The Lever rule

The D.C. Circuit's decisions in Lever Brothers Co. v. United States, 877 F.2d 101 (D.C. Cir. 1989) and 981 F.2d 1330 (D.C. Cir. 1993), held that § 1526 bars importation of physically different foreign goods bearing a U.S. mark even where the U.S. and foreign owners are affiliated, because the statute's purpose is to protect the U.S. owner's goodwill in the domestic product.

Customs implemented this in 19 C.F.R. § 133.23(b): gray market goods that are physically and materially different may be imported only if they bear a conspicuous label in close proximity to the mark stating, in English:

"This product is not a product authorized by the United States trademark owner for importation and is physically and materially different from the authorized product."

To obtain Lever rule protection, a U.S. owner must apply to CBP, demonstrate the physical and material differences, and have them published. This is a genuinely useful and underused tool for brands with real product differences.

Practical border strategy

Part V: Copyright and patent exhaustion no longer help

For years, brand owners paired trademark claims with copyright claims (on label artwork) and patent claims (on the product) to block parallel imports. Two Supreme Court decisions largely closed those routes.

Copyright: Quality King and Kirtsaeng

Quality King Distributors, Inc. v. L'anza Research International, Inc., 523 U.S. 135 (1998), held that the first sale doctrine of 17 U.S.C. § 109(a) applies to round-trip imports: copies made in the United States, sold abroad, and reimported. L'anza had tried to use copyrighted label artwork to block reimportation of its own hair care products, and lost.

Kirtsaeng v. John Wiley & Sons, Inc., 568 U.S. 519 (2013), went the rest of the way. Supap Kirtsaeng, a Thai student, had friends buy cheaper Wiley textbooks printed in Asia and ship them to him for resale in the United States. The Court held that § 109(a)'s phrase "lawfully made under this title" has no geographic limitation, so copies lawfully manufactured abroad are subject to first sale. That is international exhaustion for copyright.

Patent: Impression Products v. Lexmark

Impression Products, Inc. v. Lexmark International, Inc., 581 U.S. 360 (2017), decided two questions and answered both against the patentee.

First, a patentee's decision to sell a product exhausts all patent rights in that item, "regardless of any restrictions the patentee purports to impose." Lexmark had sold toner cartridges under a "Return Program" with an express single-use, no-resale restriction. The Court held the restriction is enforceable, if at all, in contract, not through a patent infringement suit against downstream purchasers.

Second, an authorized sale outside the United States exhausts U.S. patent rights. Chief Justice Roberts drew the analogy to Kirtsaeng directly: "Applying patent exhaustion to foreign sales is just as straightforward."

The commercial consequence is significant. A patentee that sells abroad at a lower price cannot use its U.S. patents to stop those units from returning. Its options are contractual (with privity problems), technical (region locks, which raise their own § 1201 and repair issues), or commercial (differentiated products).

For the § 1201 dimension, see The DMCA Anti-Circumvention Provisions, and note that Impression Products is also foundational to the modern right-to-repair debate discussed in The Right to Repair Movement.

What is left

Trademark. Material differences. Quality control. And commercial design.

Part VI: What actually works

Litigation is the least efficient gray market tool. Here is the practical hierarchy, roughly in order of return on effort.

1. Differentiate the products, deliberately

If the U.S. product genuinely differs from the foreign product in ways consumers care about, you have both a legal claim and a commercial answer. Differences that are cheap to implement and legally meaningful include:

  • U.S.-specific packaging with regulatory labeling.
  • Region-specific model numbers and SKUs.
  • Bundled accessories or software entitlements tied to the U.S. SKU.
  • Firmware or app features keyed to region.
  • U.S.-only formulation where regulation permits.

Do it before the dispute. A differentiation adopted after litigation begins looks pretextual, and courts say so.

2. Run a real quality control program, and document it

The Warner-Lambert elements require legitimate, substantial, nonpretextual procedures that you actually follow. Handling requirements, temperature controls, shelf-life management, lot tracking, and recall capability are the classic examples. Write the SOPs, train against them, audit them, and keep records. This program has independent operational value and creates the evidentiary record for a claim.

3. Control the channel contractually

Distribution and dealer agreements should:

  • Restrict resale to authorized channels and specified territories.
  • Require downstream flow-through of the same restrictions.
  • Prohibit sales to known diverters and require customer identification for large orders.
  • Include audit rights and the right to obtain sales records.
  • Provide for termination for diversion, with a clear cure and a clear proof standard.
  • Require serialization data reporting.

Enforce them. An unenforced distribution restriction is worse than none, because it becomes evidence that you tolerate the practice.

4. Serialize and trace

Unit-level serialization (codes, NFC tags, or covert markers) makes diversion traceable to the specific distributor who sold it. That converts a diffuse enforcement problem into a targeted contract claim against a counterparty you can actually sue. It also creates the recall capability that supports a quality control theory. And, as Davidoff and Zino Davidoff show, removal of those codes is itself actionable.

5. Use warranty policy honestly

A warranty limited to units purchased from authorized dealers is lawful and is one of the strongest material-difference facts available. Two rules:

  • Apply it consistently. A warranty policy you waive when a customer complains loudly is not a material difference.
  • Comply with the Magnuson-Moss Warranty Act, 15 U.S.C. §§ 2301 to 2312, which regulates warranty disclosures and generally prohibits conditioning warranty coverage on the use of branded parts or services without a waiver from the FTC. Denying warranty coverage on a unit not purchased through an authorized channel is different from tying warranty coverage to branded consumables, but the distinction requires care.

6. Authorized dealer programs and the antitrust boundary

An authorized dealer program that specifies who may sell, with what training, service capability, and display standards, is lawful and effective. It also gives you a clean statement to consumers about what "authorized" means, which supports a deception theory against unauthorized sellers.

But price controls are a different matter. Resale price maintenance is judged under the rule of reason after Leegin Creative Leather Products, Inc. v. PSKS, Inc., 551 U.S. 877 (2007), and is no longer per se unlawful federally. Several states, however, continue to treat it as per se unlawful under state antitrust law, and a minimum advertised price (MAP) policy unilaterally announced under United States v. Colgate & Co., 250 U.S. 300 (1919), is safer than an agreement. Draft MAP policies as unilateral policies, not as agreements, and do not negotiate over them. See Antitrust for Technology Companies.

7. Marketplace enforcement

Most marketplaces will remove listings for materially different gray market goods on a properly documented claim, though their tolerance varies and the burden of proof is higher than for counterfeits. Prepare a standard evidentiary package: the material differences, the labeling requirements, and the warranty policy.

8. Litigation, targeted

Sue the diverter you can identify, not the retailer you can find. A contract claim against a distributor who breached its territory restriction is faster, cheaper, and more likely to change behavior than a Lanham Act claim against the fifth buyer downstream.

A worked example

Vantage Instruments, Inc. (fictional) sells a $1,800 handheld spectrometer. It manufactures in Malaysia and sells worldwide through regional distributors. Its U.S. distributor complains that an online retailer is selling units at $1,250 with no U.S. warranty.

Step 1: Are the units genuine? Purchase and tear down. They are. This is a gray market case, not a counterfeiting case, and the enforcement approach changes entirely.

Step 2: What differs? The EU units ship with a Type C power adapter, a calibration certificate in English and German, firmware that defaults to CE-mandated emission limits, and a warranty card limited to the EEA. The U.S. units include a NIST-traceable calibration certificate, a U.S. warranty with next-day replacement, and access to Vantage's U.S. cloud analytics portal.

Step 3: Are the differences material? Several are strong. The calibration certificate matters enormously to laboratory buyers. The portal entitlement is a genuine functional difference. The warranty difference is classic. The plug is minor but real. On this record, Vantage has a credible material differences claim.

Step 4: Is there a quality control theory? Yes, and it may be stronger than the material differences theory. Vantage requires storage below a humidity threshold and recalibration before resale after 180 days. It has written SOPs, it audits distributors, and it can produce records. The gray units have unknown storage history and no recalibration record. That is Warner-Lambert on good facts.

Step 5: Where did they come from? Serial numbers trace to Vantage's Benelux distributor, whose agreement prohibits sales outside its territory. That is a breach of contract claim against a solvent counterparty in a forum Vantage chose in the agreement. It is the fastest, cheapest, and most effective remedy available.

Step 6: What about the border? Vantage's U.S. and foreign marks are under common ownership, so the common control exception applies and ordinary § 1526 exclusion is unavailable. But because the products are physically and materially different, Vantage should apply for Lever rule protection so that future shipments must carry the disclosure label or be excluded.

Step 7: What about the retailer? Send a demand identifying the material differences and the absence of U.S. warranty and calibration. Many retailers will add a disclosure or stop. If the retailer adds a prominent, accurate disclosure, Vantage's claim weakens considerably, which is a reason to focus upstream.

Step 8: What is the durable fix? Region-specific SKUs, a serialization program with distributor-level reporting, a Lever rule filing, contract amendments with real audit and termination provisions, and a published "authorized dealer" page so consumers can tell the difference. That package will do more than any single lawsuit.

Gray market program checklist

Legal foundation

  • U.S. trademark registrations current, in the right classes.
  • Marks recorded with CBP.
  • Lever rule application filed where physical differences exist.
  • Copyright registrations for packaging artwork (useful for takedowns even after Kirtsaeng).
  • Distribution agreements with territory restrictions, flow-down, audit rights, and diversion termination.
  • Written quality control SOPs, actually followed and documented.

Product and channel design

  • Region-specific SKUs and model numbers.
  • Region-specific packaging with U.S. regulatory labeling.
  • Unit-level serialization with distributor-level reporting.
  • Software or service entitlements tied to authorized purchase.
  • Warranty policy limited to authorized channel, applied consistently, Magnuson-Moss reviewed.
  • Published authorized dealer list.

Detection and response

  • Marketplace monitoring with test purchases and serial capture.
  • Trace-back protocol from serial to distributor.
  • Standard evidentiary package for marketplace takedowns.
  • Escalation ladder: distributor notice, contract enforcement, retailer demand, litigation.
  • Consistent record of enforcement (tolerance undermines materiality).

Antitrust hygiene

  • MAP policy drafted as a unilateral Colgate policy, not an agreement.
  • No discussions with dealers about competitors' pricing.
  • Distribution restrictions justified by legitimate quality and service rationales, documented.
  • State-law review where RPM remains per se unlawful.

Frequently asked questions

Is selling gray market goods illegal? Usually not. Genuine goods sold by a lawful owner are protected by the first sale doctrine. It becomes actionable when the goods are materially different from the authorized U.S. product, when they have escaped legitimate quality controls, or when the sale is presented in a way that deceives consumers about authorization or warranty.

We are a retailer. How do we protect ourselves? Buy from documented sources, keep invoices and provenance records, disclose clearly that the goods are imported and carry no U.S. manufacturer warranty, do not use the brand's logo in a way that suggests authorization, and get an indemnity from your supplier. Disclosure is the single most effective defensive step.

Can a brand refuse to honor its warranty on gray market units? Generally yes, if the warranty is by its terms limited to units purchased through authorized channels and the limitation is disclosed and applied consistently. Review the policy against the Magnuson-Moss Warranty Act and state consumer protection statutes.

Does the first sale doctrine apply to services or digital goods? Not in the same way. First sale under 17 U.S.C. § 109 applies to a "particular copy," and courts have held it does not authorize resale of digital files that require making a new copy. Software licensed rather than sold raises the license-versus-sale question, on which the circuits differ.

Our foreign subsidiary makes the goods. Can Customs stop the imports? Not under the ordinary rule, because the common control exception applies. Your route is the Lever rule (if there are physical differences), a Section 337 action, or trademark litigation on material differences.

Are patents useful against parallel imports anymore? Largely not, after Impression Products. An authorized foreign sale exhausts U.S. patent rights, and post-sale restrictions are contract matters. Contractual restrictions can still work against your direct counterparty.

What if the gray market goods are older versions of the product? Age and version differences can be material, especially where the newer version fixed a safety or performance issue, or where the consumer would reasonably expect current inventory. Combine with a quality control theory if you have shelf-life or recalibration requirements.

Is it worth suing? Sometimes, but ask first whether you can find the diverter. A breach of contract case against your own distributor, in the forum you selected, is dramatically better than a Lanham Act case against an anonymous reseller. See Evaluating and Assessing a Civil Case.

Closing thought

Gray market disputes feel like theft to brand owners and feel like free enterprise to resellers, and the law sits uncomfortably between those intuitions. The doctrine's actual concern is narrower than either: it asks whether the consumer, relying on the mark, is getting what the mark promises.

That framing is also the best guide to strategy. If your U.S. product is genuinely different in ways consumers care about, say so, label it, warrant it, and enforce. If it is not different, no amount of litigation will make a court invent a difference, and the honest answer is that the price gap you are defending is a pricing decision, not a trademark problem.

The brands that manage this well treat it as a supply chain and product design problem with a legal overlay, not the reverse. Serialize, differentiate, contract, and document. The lawsuit, if it comes, will then almost write itself.

Related articles

This article is provided for general informational purposes and does not constitute legal advice. Gray market outcomes depend heavily on the specific product differences, quality control records, and channel documentation. Consult qualified trademark counsel before launching an enforcement program or a parallel import business.