Unauthorized Sellers Are Listing Your Genuine Products Online: What Trademark Law Can and Cannot Do

Last updated: November 2026. Reviewed by Pavel Kolmogorov, California business litigation attorney (State Bar No. 321018).

When unauthorized sellers list your genuine products on a marketplace, trademark law usually cannot stop them alone. Under the first sale doctrine, a producer's right to control distribution of a trademarked product generally ends with the first sale. (Sebastian International, Inc. v. Longs Drug Stores Corp. (9th Cir. 1995) 53 F.3d 1073, 1074.) The claim can return when goods are repackaged without notice, materially different, or sold as if the seller were authorized. Kolmogorov Law, P.C. represents brand owners and accused resellers in Orange County, Los Angeles, and across California.

Call (909) 235-6116 or contact us online to discuss unauthorized sellers of your products, or an infringement complaint against your listings.

What the first sale doctrine protects

Trademark infringement requires a use that is likely to cause confusion, mistake, or deception. (15 U.S.C. § 1114(1).) A genuine product sold under its true mark ordinarily does not confuse anyone about who made it. (Enesco Corp. v. Price/Costco Inc. (9th Cir. 1998) 146 F.3d 1083, 1085.)

The Ninth Circuit has put the rule in plain terms. A purchaser who does no more than stock, display, and resell a producer's product under the producer's trademark violates no right the Lanham Act gives the producer. That holds even if some shoppers wrongly assume the reseller is an authorized dealer. (Sebastian International, supra, 53 F.3d at p. 1076.)

Two consequences follow. "Unauthorized" is not the same as unlawful. And a lower price is not infringement.

The exceptions brand owners rely on

The doctrine plainly covers mere resale. A seller who does something more, or sells something different, can lose that protection, and the result often turns on what buyers are told.

• Implying affiliation. A reseller that uses the mark to suggest it is part of the brand's authorized sales network goes beyond resale. The court in Sebastian pointed to advertising and trade show displays that had that effect. (53 F.3d at p. 1076.) Calling a storefront an "official" or "authorized" outlet is the modern version.
• Repackaging without notice. Selling genuine goods in new packaging, without telling buyers who repackaged them, can confuse the public about the reseller's role and may support an injunction requiring a notice. (Enesco, supra, 146 F.3d at p. 1086.)
• Lost quality control. Courts have found infringement where goods bypassed the brand's quality controls and carried a defect, or a potential defect, that a customer could not readily detect. Goods that skipped the maker's inspection or were stored improperly are the examples the court gave. The exception has limits. The court declined to apply it to a claim that a reseller's repackaging left fragile goods exposed to chipping. (Enesco, supra, 146 F.3d at p. 1087.)
• Material differences. In the Ninth Circuit, a gray market good counts as genuine only if it does not differ materially from the product the trademark owner sells here. Differences in language, packaging, and quality control have each been treated as material. Versions made for another market are the typical case.
• Fakes. If the goods are not yours at all, the first sale doctrine has nothing to say, and the remedies on our counterfeit products page apply.

Each exception needs evidence, which means test purchases, photographs, and batch or serial records.

What does not work

Telling a marketplace that genuine goods are counterfeit does not work, and it creates exposure. Platforms generally require the complainant to affirm that a report is accurate, and a false one can lead to an interference claim by the seller.

Printing a statement on the package that only approved dealers may sell the product does not create a trademark claim either. The Ninth Circuit rejected that move, reasoning that a producer could otherwise escape the first sale rule with a label. (Sebastian International, supra, 53 F.3d at pp. 1076-1077.)

Demand letters that assert infringement over nothing more than resale tend to harden the other side. I would rather find the real exception, or the real contract breach, and write about that.

Contract tools against the source of the leak

Unauthorized sellers get inventory from somewhere, and that somewhere is usually one of your own distributors or retailers. Contract law reaches what trademark law does not.

A distribution agreement can limit whom the distributor may sell to, require records of sales, and allow termination for diversion. Batch codes and serial numbers let you trace a test purchase back to the account it came from. The breach claim runs against the distributor. A reseller that knowingly induced the breach may face a claim for interference with contract. Our page on distribution agreement disputes covers termination and its risks.

Listing content and marketplace reports

A reseller may generally use your brand name to say what it is selling. That is the nominative use described on our trademark defenses page. Your product photographs and written descriptions are another matter, because copying them can be copyright infringement regardless of whether the goods are genuine.

Marketplace complaint systems respond to specific, documented violations. Our page on marketplace IP complaints explains what a complaint needs and what happens when one is wrong.

If you are the reseller accused of infringement

Your position is strong if three things are true. The goods are genuine. You bought them lawfully and can show the invoices. And you sell them as they came, without altering, relabeling, or repackaging them.

Keep your listing clean. Do not describe yourself as authorized if you are not. Say plainly if the manufacturer's warranty does not apply to your sales. Use your own photographs.

If a brand files a marketplace complaint anyway, answer it with your invoices and ask the brand in writing to withdraw it. The marketplace complaints page linked above covers what to do when false complaints keep coming.

What to bring to the first meeting

• Test purchases, with photographs of the goods, packaging, and codes.
• The listings at issue, captured with dates.
• Distribution and retailer agreements, for brand owners.
• Supplier invoices and the complaint notice, for resellers.

Frequently asked questions

Unauthorized sellers are listing our genuine products on Amazon below our price. Can we stop them with trademark law?

Usually not on those facts alone. Federal courts in California apply the first sale doctrine, under which reselling a genuine, unaltered product under its real brand name is not trademark infringement. You need something more: repackaged goods, material differences, lost quality control, or a seller implying it is authorized. Contract claims against the distributor supplying the goods are often the better route.

What is the first sale doctrine in trademark law?

It is the rule that a trademark owner's right to control distribution of a product generally ends once the product is first sold. Anyone who lawfully buys the genuine article may resell it under the original mark. In the Ninth Circuit, which covers California, a reseller who only stocks, displays, and resells genuine goods does not infringe.

A brand filed an infringement complaint against my listing even though I sell genuine products I bought legally. What can I do?

Respond through the marketplace with proof that the goods are genuine and lawfully acquired, and send the brand the same proof with a request to retract. Reselling genuine, unaltered goods is generally lawful under federal trademark law as applied in California. If false complaints continue, you may have claims for interference with your business and for a court declaration.

Are gray market goods illegal?

Not necessarily. Gray market goods are genuine products that were made for sale in another market and reach buyers here outside the brand's chosen channels. The Ninth Circuit, which covers California, asks whether the goods differ materially from the version the trademark owner sells in the United States, for example in language, packaging, or quality control. Material differences can turn a lawful resale into infringement.

Can I stop unauthorized sellers through my distributor contracts?

Often that is the most effective tool. A written distribution agreement can restrict whom a distributor may supply and allow termination when product is diverted. With batch or serial tracing, a California brand owner can identify the source and bring a breach of contract claim against it. Trademark claims remain available where one of the first sale exceptions applies.

Talk to a California trademark litigation attorney

If unauthorized sellers are affecting your brand, or a brand is trying to remove your lawful listings, call (909) 235-6116 or contact us online. Kolmogorov Law, P.C. is at 327 Magnet, Irvine, CA 92618, and represents businesses in Orange County, Los Angeles, and throughout California. Our IP litigation practice page describes the wider practice.

This page provides general information about federal trademark law as applied in California and is not legal advice. Outcomes depend on the goods, how they are sold, the contracts involved, and the court.