A trademark is a promise kept in public. When you see the bitten apple, the swoosh, or the particular square bottle and black-and-white label of a certain Tennessee whiskey, your brain performs a small, instantaneous act of trust: you assume you know who made the thing and roughly what to expect from it. Trademark law exists to protect that flash of recognition--not because brands have some mystical moral claim on letters and shapes, but because consumers rely on marks to find what they want and avoid what they don't, and because honest sellers deserve not to have their hard-won reputations hijacked. Infringement law is what happens when someone breaks the promise: when a newcomer's mark makes shoppers believe they are buying from the senior brand when they are not.

This article is Part 4 of our four-part trademark overview. Part 1 explained what can be a trademark in the first place--words, logos, trade dress, color, sound, and where the law draws the line at generic and functional matter. Part 2 covered the substantive standards a mark must meet to earn and keep protection--distinctiveness, secondary meaning, and use in commerce. Part 3 walked through obtaining rights and licensing them. Here, in Part 4, we get to the part everyone actually fights about: enforcement. What counts as infringement, what related wrongs the Lanham Act reaches, what defenses a defendant can raise, and what a winner actually walks away with.

By the end, you will understand the central test of infringement--likelihood of confusion--and why two competent lawyers can stare at the same two marks and reach opposite conclusions in good faith. You will see how dilution protects famous marks even when nobody is confused; how the law handles domain-name squatters and gray-market importers; how false-advertising claims ride alongside trademark claims; and how the Supreme Court's 2023 decision in Jack Daniel's Properties, Inc. v. VIP Products LLC, 599 U.S. 140 (2023), redrew the boundary between a brand owner's rights and an artist's free-speech defense. We keep the law accurate and current to 2026, define every term of art in plain English, and use clearly labeled hypotheticals so a judge, a lawyer, and a curious business owner can all follow along.

A word of orientation before we start. Most of the doctrine below lives in the federal Lanham Act of 1946, codified at 15 U.S.C. §§ 1051 et seq. Two sections do most of the heavy lifting. Section 32 (15 U.S.C. § 1114) gives the owner of a federally registered mark a cause of action against infringers. Section 43(a) (15 U.S.C. § 1125(a)) reaches further: it protects unregistered marks, trade dress, and even creates a federal false-advertising claim, all under the umbrella of "false designation of origin." Layered on top are the federal dilution statute (Section 43(c)), the cybersquatting statute (Section 43(d)), the criminal and civil counterfeiting provisions, the gray-market and customs framework, and a thick body of state statutory and common law that usually travels along with the federal claims. We will take them in turn.

The Anatomy of an Infringement Claim

Strip away the jargon and a trademark infringement claim has three load-bearing elements. The plaintiff must prove that (1) it owns a valid, protectable mark; (2) its rights are senior--that is, it has priority over the defendant; and (3) the defendant's use is likely to cause confusion among consumers about the source, sponsorship, or affiliation of the goods or services. Get any one of these wrong and the claim collapses.

The first element, validity, connects this article back to Parts 1 and 2 of the series. A mark must be distinctive--either inherently (a coined term like KODAK, an arbitrary word like APPLE for computers, or a suggestive mark like COPPERTONE) or through acquired distinctiveness, also called secondary meaning, where the public has come to associate an otherwise descriptive term with a single source. A generic term ("Email" for email) can never be a trademark, and a functional feature (the shape of a screw thread that makes it work) cannot be claimed as trade dress. If the defendant can show the asserted mark is generic, functional, or abandoned, the plaintiff has nothing to enforce. For the full treatment of those threshold questions, see Part 1 on the subject matter of trademark law.

The second element, priority, embodies one of trademark law's deepest principles: rights flow from use, not from filing. In the United States, the first party to actually use a mark in commerce on particular goods generally owns it in the territory where it is used, even without a registration. A federal registration on the Principal Register supercharges those rights--it provides nationwide constructive use as of the application filing date, a legal presumption of validity and ownership, and (after five years of continuous use and a Section 15 filing) potential incontestability, which forecloses many challenges. We unpack registration mechanics in Part 3, obtaining protection and licensing. The key point for infringement is that when the plaintiff holds a Principal Register registration, the burden shifts: the registration is presumptive proof of validity, ownership, and the exclusive right to use the mark nationwide for the listed goods, and it is the defendant who must rebut those presumptions. 15 U.S.C. § 1115(a)-(b).

The third element--likelihood of confusion--is where the real action is, so it gets its own deep treatment below. But notice what the standard is not. The plaintiff does not have to prove that any actual consumer was actually fooled. The standard is probabilistic and prospective: is confusion likely? That is why a brand owner can sue to stop a confusingly similar mark before it has done measurable damage, and why so many disputes turn on prediction rather than proof of past harm.

One more framing point that trips up newcomers. The USPTO does not police the marketplace for you. The Office examines applications to keep confusingly similar marks off the register under Section 2(d), but once your registration issues, the duty to find and stop infringers is entirely yours. Owners who sleep on their rights can lose them--through the equitable defense of laches discussed later, through a finding that the mark has slid into genericness, or through abandonment by uncontrolled licensing or non-use. Enforcement is not optional housekeeping; it is part of what keeps the mark alive. For the maintenance side of that obligation, see maintaining trademark registrations.

Likelihood of Confusion: The Heart of the Matter

Likelihood of confusion is the single most important concept in trademark enforcement. In plain terms, it asks whether an appreciable number of ordinary, reasonably prudent consumers are likely to be confused about who is behind the product--confused about its source, or about whether the two brands are sponsored by, affiliated with, or endorsed by one another. It is the test for infringement under both Section 32 and Section 43(a). It is also, somewhat confusingly, the same standard the USPTO applies under Section 2(d) when it refuses registration of a mark that resembles an existing one, and the same standard the Trademark Trial and Appeal Board (TTAB) applies in oppositions and cancellations--though, as we will see, a finding in one forum does not always bind the other.

Because the question is so fact-intensive, every federal circuit has developed its own multifactor test. The factors overlap heavily, but the lists carry the names of the founding cases. In the Second Circuit they are the Polaroid factors, from Polaroid Corp. v. Polarad Electronics Corp., 287 F.2d 492 (2d Cir. 1961). In the Ninth Circuit they are the Sleekcraft factors, from AMF Inc. v. Sleekcraft Boats, 599 F.2d 341 (9th Cir. 1979). The Federal Circuit and the TTAB use the DuPont factors, from In re E.I. DuPont DeNemours & Co., 476 F.2d 1357 (C.C.P.A. 1973). Other circuits have their own variants--the Frisch's factors in the Sixth Circuit, the Lapp factors in the Third, the Roto-Rooter/Eli Lilly lineage in the Seventh. For a circuit-by-circuit deep dive, see our companion piece on navigating the maze of trademark confusion.

The labels differ, but the same handful of considerations recur. Here is how the canonical factors line up across the three most-cited tests:

Core consideration Second Cir. (Polaroid) Ninth Cir. (Sleekcraft) Fed. Cir./TTAB (DuPont)
Strength of the senior mark Yes Yes Yes (fame/strength)
Similarity of the marks Yes Yes Yes (appearance, sound, meaning)
Proximity/relatedness of goods Yes Yes Yes (similarity of goods; channels)
Marketing/trade channels (within proximity) Yes Yes
Buyer sophistication/care Yes Yes Yes (conditions of purchase)
Junior user's intent/good faith Yes Yes (considered; good faith)
Actual confusion Yes Yes Yes (nature/extent)
Likelihood of bridging the gap Yes (subsumed) (subsumed)
Quality of junior user's goods Yes Yes --

Let us walk the factors with a running hypothetical. (Hypothetical.) Suppose Acme Roasters, a well-known specialty coffee company, sells beans and brewed coffee under the registered mark ACME for coffee. A newcomer, Acme Brew Co., opens a chain of coffee shops using the name ACME BREW. Acme Roasters sues. How does a court think about it?

Strength of the senior mark. The stronger and more distinctive the plaintiff's mark, the broader its protection. Strength has two components. Conceptual strength reflects where the mark sits on the distinctiveness spectrum--an arbitrary or fanciful mark is conceptually strong; a descriptive or weak suggestive mark is not. Commercial strength reflects marketplace recognition: advertising spend, sales, length of use, unsolicited media. If ACME is a coined, heavily advertised national brand, it is strong and the court will guard it jealously. If "acme" is a tired dictionary word used by dozens of companies in unrelated fields, its scope shrinks. A crowded field of similar marks is powerful evidence of weakness, and defendants routinely submit third-party registration and use evidence to prove the field is crowded.

Similarity of the marks. Courts compare the marks in their entireties--appearance, sound, and meaning (the "sight, sound, and meaning" trilogy)--as encountered in the marketplace, not laid side by side on a courtroom easel. The proper question is whether a consumer carrying a hazy memory of ACME would be confused on later seeing ACME BREW. Adding a generic or descriptive term like "Brew" to the dominant ACME element rarely saves a junior user, because consumers anchor on the distinctive part and tend to forget the rest.

Relatedness (proximity) of the goods or services. The goods need not be identical; they need only be related enough that consumers might assume a common source or a sponsorship relationship. Beans and brewed coffee in a café are about as proximate as goods get. By contrast, ACME for industrial lubricants and ACME for ballet slippers almost certainly do not collide, because no reasonable consumer expects one company to make both. A close cousin in some circuits is the "likelihood of bridging the gap"--whether the senior user might plausibly expand into the junior user's line, as Acme Roasters might naturally open its own cafés.

Marketing and trade channels. Do the parties reach the same customers through the same channels--same stores, same websites, same social-media audiences, same price points? Overlap increases the chance of confusion. Our two coffee companies clearly overlap.

Purchaser sophistication and care. Inexpensive impulse buys (a $4 latte) get less consumer scrutiny than considered, expensive purchases (a $40,000 commercial espresso machine for a restaurant). The more careful the buyer, the less likely the confusion. This is why luxury and industrial cases often come out differently from consumer-staples cases--and why the relevant "consumer" is whoever actually does the buying in that market.

The junior user's intent. Evidence that the defendant intended to trade on the plaintiff's goodwill--copying the look, the slogan, the trade dress--is powerful. Bad intent is not required for infringement, but proof of it can tip a close case and, as we will see, opens the door to enhanced remedies. Good-faith adoption after a clearance search cuts the other way; see the shield of good faith.

Actual confusion. Evidence that real consumers were actually confused--misdirected emails, customer complaints, wrong-number calls, survey results--is the most persuasive proof a plaintiff can offer, because it converts the hypothetical into the demonstrated. But its absence is rarely fatal: actual confusion is notoriously hard to capture, especially early in a junior user's life, so courts treat a lack of it cautiously, particularly where the marks have not coexisted for long.

No single factor controls, and courts do not tally them like a scorecard. The analysis is holistic, and a strong showing on a few central factors (similarity plus proximity, for instance) can outweigh a scatter of neutral ones. Survey evidence--consumer studies measuring the percentage of respondents who associate the junior mark with the senior brand--is common in high-stakes cases but expensive and contestable. Courts have grown wary of poorly designed surveys, and a botched survey (leading questions, a stacked control group, the wrong universe of respondents) can wound the side that commissioned it.

A few doctrinal wrinkles deserve names. Initial-interest confusion occurs when a junior user borrows the senior mark to lure customers in the door, even if the confusion evaporates before any sale--think of a competitor buying a rival's brand name as a search keyword. Courts are split on how much weight to give it, and the doctrine has narrowed in the online context as judges have grown comfortable that consumers understand search results. Post-sale confusion addresses confusion in the eyes of observers after the sale--the classic example is counterfeit luxury goods, where the buyer knows the handbag is fake but onlookers do not, diluting the brand's prestige and undercutting demand for the real thing. Reverse confusion flips the usual story: a large junior user floods the market so heavily that consumers come to believe the senior user's goods originate with the junior one, swamping the smaller original and stripping it of control over its own name. Each of these expands the basic confusion inquiry beyond the simple "consumer buys the wrong thing" scenario.

Who Can Be Liable: Direct, Contributory, and Vicarious Infringement

Most infringement suits target the company that put the offending mark on the goods. But the Lanham Act's reach is broader. A defendant can be liable not only for direct infringement but also for contributory infringement--intentionally inducing another to infringe, or continuing to supply a product to one it knows or has reason to know is infringing, the rule the Supreme Court announced in Inwood Laboratories, Inc. v. Ives Laboratories, Inc., 456 U.S. 844 (1982). Contributory liability is the theory that drags landlords of counterfeit-stuffed flea markets, payment processors, and online marketplaces into the dispute, and it is central to the running battle between luxury brands and e-commerce platforms over counterfeit listings. Vicarious liability, borrowed from agency principles, reaches a defendant who has the right and ability to control the infringer and a direct financial interest in the infringement. For brand owners, these doctrines matter because the deepest pocket--and the most efficient choke point--is often not the fly-by-night counterfeiter but the platform or supplier standing behind it. See our discussion of platform exposure in Section 230 reform and platform liability.

Dilution: Protecting Fame, Not Preventing Confusion

Some marks are so famous that the law protects them even when there is no chance anyone is confused. That protection is called dilution, and it lives in Section 43(c) of the Lanham Act, 15 U.S.C. § 1125(c), as enacted by the Trademark Dilution Revision Act of 2006 (TDRA). Dilution is a different animal from infringement, and understanding why is one of the most useful things a non-specialist can learn about trademark law.

(Hypothetical.) Imagine a small dental practice that opens under the name "Tiffany Dental." No one walking past the office thinks the famous jeweler has started filling cavities; there is zero likelihood of confusion. Yet over time, if "Tiffany" began appearing on bakeries, plumbing companies, and law firms, the singular, immediate association between the word and the jewelry house would erode. The mark's selling power--its capacity to call one specific source instantly to mind--would be whittled away. Dilution law protects against precisely that erosion. It exists because the most valuable marks are commercial assets in their own right, and the law lets their owners prevent the slow death of a thousand unauthorized cuts.

The TDRA limits this strong protection to a small club. The plaintiff must own a mark that is famous, and the statute means nationally famous--"widely recognized by the general consuming public of the United States as a designation of source." 15 U.S.C. § 1125(c)(2)(A). This is a high bar that Congress deliberately raised in 2006 to overrule cases that had allowed "niche fame." Marks famous only within a specialized industry do not qualify. Think APPLE, COCA-COLA, NIKE, GOOGLE, MCDONALD'S--household names, not regional favorites. The statute lists factors for fame: the duration, extent, and geographic reach of advertising; the volume of sales; the extent of actual recognition; and whether the mark is registered.

The TDRA recognizes two kinds of dilution. Dilution by blurring is the impairment of distinctiveness that comes from association between the famous mark and another's use--the "Tiffany Dental" scenario, where the famous mark's uniqueness is diluted by its appearance elsewhere. The statute supplies its own six factors, including the similarity of the marks, the distinctiveness and recognition of the famous mark, the degree of exclusive use, and whether the junior user intended to create an association. 15 U.S.C. § 1125(c)(2)(B). Dilution by tarnishment is harm to the famous mark's reputation from association with something shoddy, unsavory, or offensive--the classic illustrations involve a famous mark placed on inferior products or dropped into a sexual or otherwise degrading context. 15 U.S.C. § 1125(c)(2)(C).

Three features make dilution narrower than it first appears. First, the plaintiff need not show competition or confusion, but it does need national fame, which the overwhelming majority of marks lack. Second, the statute contains broad exclusions: fair use (including comparative advertising and parody), news reporting and commentary, and any noncommercial use are all carved out. 15 U.S.C. § 1125(c)(3). The noncommercial-use and parody exclusions do enormous work and are the reason most "but it's making fun of a famous brand" disputes never reach a dilution finding. Third, as the Supreme Court emphasized in the Jack Daniel's case discussed below, those exclusions have their own limits when the junior party is using the famous mark as a mark--to brand its own goods--rather than purely expressively.

One under-appreciated wrinkle on the remedy side: although willfulness is no longer a strict precondition to disgorging an infringer's profits in ordinary infringement cases (more on Romag below), the Lanham Act still requires willful dilution before a famous-mark owner may recover the diluter's profits or other monetary relief. 15 U.S.C. § 1117(a). For non-willful dilution, the practical remedy is an injunction. That asymmetry is one more reason dilution is often pleaded as a belt-and-suspenders complement to a confusion claim rather than the main event.

Finally, many states have their own anti-dilution statutes, some predating the federal one and some still recognizing the niche fame the TDRA rejects. For federally famous marks, plaintiffs typically plead federal and state dilution together with their infringement claims.

Cybersquatting: The ACPA and Domain-Name Abuse

When the commercial internet arrived in the 1990s, a cottage industry of opportunists raced to register domain names corresponding to famous brands and then offered to sell them back to the brand owners at a ransom. Trademark law had no clean tool for this; the squatters were not selling competing goods, so confusion-based infringement was a poor fit, and dilution required fame. Congress responded in 1999 with the Anticybersquatting Consumer Protection Act (ACPA), codified as Section 43(d) of the Lanham Act, 15 U.S.C. § 1125(d).

The ACPA creates liability for anyone who, with a bad-faith intent to profit, registers, traffics in, or uses a domain name that is identical or confusingly similar to a distinctive mark (or, for famous marks, dilutive of them). The bad-faith requirement is the crux, and the statute supplies a nonexclusive list of nine factors to gauge it--whether the registrant has any IP rights or legitimate connection to the name, whether it offered to sell the domain without ever having used it for a bona fide site, whether it provided false contact information to the registrar, whether it registered multiple domains matching others' marks, and so on. 15 U.S.C. § 1125(d)(1)(B). A registrant with a genuine, good-faith reason to use a name--say, a person whose own name happens to match a brand--enjoys a safe harbor if it reasonably believed its use was lawful.

The ACPA offers two procedural innovations that make it formidable. First, statutory damages of $1,000 to $100,000 per domain name, at the court's discretion, which spares the plaintiff the near-impossible task of proving actual harm from a parked page. 15 U.S.C. § 1117(d). Second, and ingeniously, in rem jurisdiction: where the squatter cannot be found or is beyond the court's personal jurisdiction, the trademark owner can sue the domain name itself in the judicial district where the registry or registrar sits, and obtain transfer or cancellation of the offending name. 15 U.S.C. § 1125(d)(2). That feature matters enormously against anonymous or foreign squatters who would otherwise be untouchable.

The ACPA is not the only route. The contractual Uniform Domain-Name Dispute-Resolution Policy (UDRP), administered by ICANN-approved providers like WIPO, offers a faster, cheaper, worldwide arbitration-style process whose only remedies are transfer or cancellation--no money changes hands. Many brand owners start with a UDRP complaint and reserve the ACPA for cases where they want damages, where the squatter is a serial offender, or where they need in rem reach. We cover that path in detail in how to file a UDRP complaint for domain name disputes, and the broader strategy in brand protection online. For the underlying landscape of domains, see top level domain names--an overview.

Section 43(a): False Designation of Origin and False Advertising

Section 43(a) of the Lanham Act, 15 U.S.C. § 1125(a), is the Swiss Army knife of the statute. It reaches conduct that is "likely to cause confusion, or to cause mistake, or to deceive" as to the origin, sponsorship, or approval of goods or services, and it does so without requiring a federal registration. It has two distinct prongs.

Section 43(a)(1)(A)--false designation of origin (unfair competition). This is the home of federal protection for unregistered trademarks and trade dress. Court decisions long ago established that Section 43(a) gives the owner of a common-law mark a federal cause of action for infringement under the same likelihood-of-confusion standard that governs registered marks. That is why plaintiffs who own registrations almost always plead Section 43(a) alongside Section 32: if the registration is somehow knocked out during the litigation--say, on a technical ground or a fraud counterclaim--the 43(a) claim can survive on the strength of common-law use, because it does not depend on the registration's existence. Section 43(a)(1)(A) also covers false claims of sponsorship, endorsement, or affiliation, and the twin torts of "passing off" (selling your goods as someone else's) and "reverse passing off" (selling someone else's goods as your own, by relabeling them), both of which confuse consumers about who really stands behind a product. The Supreme Court policed the outer edge of reverse passing off in Dastar Corp. v. Twentieth Century Fox Film Corp., 539 U.S. 23 (2003), holding that "origin" in Section 43(a) means the producer of the physical goods, not the author of any underlying creative content--so a Section 43(a) claim cannot be used as a back-door copyright or attribution right.

Section 43(a)(1)(B)--false advertising. The second prong reaches commercial advertising or promotion that misrepresents the nature, characteristics, qualities, or geographic origin of one's own or another's goods or services. This is primarily a competitor's tool--it lets a business sue a rival for lying in its ads in ways that cause commercial injury. The elements typically require a false or misleading statement of fact in commercial advertising, actual deception or a tendency to deceive, materiality, placement in interstate commerce, and resulting injury. The statement can be literally false (in which case some courts presume deception, especially where intent to deceive is shown) or literally true but misleading in context. Note the standing limit the Supreme Court set in Lexmark International, Inc. v. Static Control Components, Inc., 572 U.S. 118 (2014): a false-advertising plaintiff must fall within the "zone of interests" the statute protects and show injuries proximately caused by the deception--generally a commercial competitor or someone whose commercial interests were harmed, not an ordinary consumer. We devote a full article to this prong in the technology context: false advertising and Lanham Act Section 43(a).

A useful way to remember the division: 43(a)(1)(A) protects against confusion about who made it; 43(a)(1)(B) protects against lies about what it is or does. Both share the Lanham Act's remedies and both can be pleaded together with registered-mark claims.

Counterfeiting and Gray-Market Goods: The Sharpest Teeth in the Act

Counterfeiting is trademark infringement's most aggravated form--the use of a spurious mark that is identical to, or substantially indistinguishable from, a registered mark, on the very goods for which that mark is registered. The fake ROLEX, the bootleg LOUIS VUITTON, the knockoff NIKE on goods that never saw a Nike factory. Because counterfeiting is deliberate deception aimed squarely at riding a brand's goodwill, Congress armed trademark owners with extraordinary remedies.

On the civil side, a successful counterfeiting plaintiff can recover treble (triple) damages or profits and attorney's fees as a near-automatic matter for willful counterfeiting, and can instead elect statutory damages of up to $2,000,000 per counterfeit mark per type of goods for willful conduct (with a floor of $1,000 and a default ceiling of $200,000 per mark per type of good for non-willful counterfeiting). 15 U.S.C. § 1117(b)-(c). The statutory-damages election is invaluable precisely because counterfeiters keep no usable books--you cannot disgorge profits you cannot prove. Courts can also order ex parte seizure of counterfeit goods and the records and instruments used to make them under 15 U.S.C. § 1116(d)--a powerful tool that lets a brand owner, with a court's blessing and before the defendant knows what is coming, sweep up the inventory before it vanishes into a moving truck.

Counterfeiting is also a federal crime. The Trademark Counterfeiting Act of 1984, codified at 18 U.S.C. § 2320, makes trafficking in counterfeit goods or services punishable by substantial fines and imprisonment, with steeper penalties for repeat offenders and for counterfeit drugs, military goods, and goods whose use risks serious bodily injury.

Brand owners also have a border defense. By recording their federal registrations with U.S. Customs and Border Protection (CBP) through CBP's electronic e-Recordation system, they enable customs officers to detain and seize infringing and counterfeit imports before those goods ever reach the market. Recordation is inexpensive, lasts the life of the registration, and is one of the highest-leverage enforcement steps a brand can take--an officer at the port of Los Angeles can stop a container that a litigator would spend years and a fortune chasing.

The border framework also governs gray-market (parallel-import) goods--genuine articles, bearing the genuine mark, made for sale abroad and then imported into the United States outside the brand owner's authorized channels. These are not counterfeits; the mark is real. But U.S. trademark owners can still assert infringement under Sections 32 and 43(a) where the imported goods are materially different from the authorized U.S. product--different formulations, warranties, packaging, or quality controls--because those material differences are themselves likely to cause consumer confusion and to damage the owner's goodwill. See Original Appalachian Artworks, Inc. v. Granada Electronics, Inc., 816 F.2d 68 (2d Cir. 1987). The material-difference threshold is deliberately low; even modest differences (a missing English-language insert, a different fill weight, the absence of the U.S. warranty) can support a claim. The strategy connects to the broader online enforcement playbook in brand protection online and to the trademark-in-virtual-goods frontier in trademark challenges in the metaverse and virtual goods.

When the Use Is Expressive: Rogers, Parody, and the Jack Daniel's Reset

Some of the most interesting trademark disputes pit a brand owner against a defendant who is not selling a competing soda or sneaker but is saying something--an artist, a satirist, a documentary filmmaker, a maker of a parody product. The First Amendment hovers over these cases, and for decades courts used a special filter to keep trademark law from smothering protected speech.

That filter is the Rogers test, from Rogers v. Grimaldi, 875 F.2d 994 (2d Cir. 1989), a case about the Fellini film Ginger and Fred and a claim by Ginger Rogers. Under Rogers, when a trademark is used in an expressive work, the Lanham Act does not apply unless the use either has no artistic relevance to the work or, if it has some relevance, explicitly misleads consumers about the source or content. The test is speech-protective by design: it tilts heavily toward letting artists reference brands, and many courts used it to dispose of trademark claims against books, films, songs, and video games at the pleading stage. The Ninth Circuit's decision in Mattel, Inc. v. MCA Records, Inc., 296 F.3d 894 (9th Cir. 2002)--the "Barbie Girl" song case--is the canonical example of Rogers shielding a parody, and ETW Corp. v. Jireh Publishing, Inc., 332 F.3d 915 (6th Cir. 2003), applied similar reasoning to protect a painting depicting Tiger Woods at the Masters.

Then came dog toys. VIP Products sold a squeaky chew toy called "Bad Spaniels," shaped like a Jack Daniel's whiskey bottle and covered in label-parody jokes ("The Old No. 2 on Your Tennessee Carpet" instead of "Old No. 7 Tennessee Whiskey"). Jack Daniel's sued for infringement and dilution. VIP argued the toy was an expressive parody entitled to Rogers protection, and the Ninth Circuit agreed. The Supreme Court, in Jack Daniel's Properties, Inc. v. VIP Products LLC, 599 U.S. 140 (2023), unanimously reversed--and in doing so meaningfully reshaped the landscape.

The Court's holding is narrow but consequential. Rogers, the Court explained, has no application when the alleged infringer uses the challenged mark as a mark--that is, "as a designation of source for [its] own goods." When VIP used Bad Spaniels (a play on Jack Daniel's marks and trade dress) to brand and sell its own product, it was using the imagery to identify the source of its dog toy, which puts it squarely within ordinary likelihood-of-confusion analysis, parody or no parody. The joke does not get the case thrown out under a special First Amendment filter; instead, the humor feeds into the standard confusion factors--a successful parody that consumers clearly understand as a joke is less likely to confuse them about source. On the dilution claim, the Court likewise held that the TDRA's noncommercial-use exclusion does not shield a defendant who uses a famous mark as a designation of source for its own goods, even humorously, because the parody exclusion under § 1125(c)(3)(A) does not apply when the use is "as a designation of source for the person's own goods or services."

The practical upshot, as lower courts have applied it through 2026: the Rogers test survives, but only for genuinely expressive uses where the mark is not functioning as a source identifier for the defendant's own products--titles of artistic works, references within a film or song, and the like. The moment a defendant slaps a riff on a famous mark onto its own product and sells it, it is back in standard trademark territory, where it can still win by showing no likelihood of confusion but does not get the early, speech-protective exit Rogers once offered. Parody remains a real and frequently successful defense; it just does its work inside the confusion analysis rather than as a threshold bypass. Courts have spent the post-2023 period recalibrating exactly where the "as a mark" line falls, and the area remains genuinely unsettled at the margins--worth flagging for anyone litigating an expressive-use case.

Defenses to Infringement and Related Claims

A defendant facing a trademark claim has a deep bench of defenses. They fall into a few families.

Attacks on the mark itself. The most fundamental defense is to deny that the plaintiff has a valid, protectable mark at all. The defendant may argue the mark is generic (and therefore unprotectable as a matter of law--the strongest possible attack, since even an incontestable registration can be cancelled for genericness); merely descriptive without secondary meaning; functional (for trade dress); or abandoned through non-use (three consecutive years of non-use creates a statutory presumption of abandonment under 15 U.S.C. § 1127) or through uncontrolled "naked" licensing that severs the mark from any quality control. A registration's presumptions can be rebutted, and a counterclaim to cancel the registration often rides along with these defenses. Where the registration is incontestable, the grounds of attack narrow but still include genericness, functionality, fraud on the USPTO, and abandonment. 15 U.S.C. § 1115(b).

Descriptive (classic) fair use. Codified at 15 U.S.C. § 1115(b)(4), this defense lets a defendant use a word descriptively, in good faith and not as a mark, to describe its own goods--even if that word happens to be someone's trademark. The reported cases give it texture: a maker of cranberry juice could describe a "sweet-tart" flavor despite the SWEETARTS mark (Sunmark, Inc. v. Ocean Spray Cranberries, Inc., 64 F.3d 1055 (7th Cir. 1995)), and a chemical company could call its product a "larvicide" despite the LARVACIDE mark (Soweco, Inc. v. Shell Oil Co., 617 F.2d 1178 (5th Cir. 1980)). The controlling Supreme Court case, KP Permanent Make-Up, Inc. v. Lasting Impression I, Inc., 543 U.S. 111 (2004), holds that a defendant asserting descriptive fair use need not negate all likelihood of confusion--some risk of confusion is the price the senior user pays for choosing a descriptive term to begin with. The defense requires that the term be used (1) other than as a mark, (2) descriptively, and (3) in good faith.

Nominative fair use. Distinct from descriptive fair use, this doctrine permits a defendant to use the plaintiff's mark to refer to the plaintiff's own goods or services--because sometimes there is no other way to talk about a product than by its name. A repair shop may advertise that it services TOYOTA vehicles; a comparative ad may name the competitor; a journalist may name the brand under discussion. The Ninth Circuit's test, from New Kids on the Block v. News America Publishing, Inc., 971 F.2d 302 (9th Cir. 1992), asks whether (1) the product is not readily identifiable without the mark, (2) the defendant used only so much of the mark as reasonably necessary, and (3) the defendant did nothing to suggest sponsorship or endorsement. Other circuits, including the Third in Century 21 Real Estate Corp. v. Lendingtree, Inc., 425 F.3d 211 (3d Cir. 2005), fold the same concerns into their confusion analysis rather than treating nominative fair use as a freestanding affirmative defense.

First Amendment and expressive use. As discussed above, genuinely expressive uses can invoke Rogers--now confined by Jack Daniel's to cases where the mark is not used as a source identifier--and parody, comparative advertising, commentary, and news reporting also enjoy statutory dilution exclusions under § 1125(c)(3).

Equitable defenses. Even a meritorious claim can be defeated or limited by the plaintiff's own conduct. Laches bars relief where the plaintiff unreasonably delayed in suing and the delay prejudiced the defendant--for example, by letting the junior user pour years and money into building a business around the mark before objecting. See, e.g., Saratoga Vichy Spring Co. v. Lehman, 625 F.2d 1037 (2d Cir. 1980). Because the Lanham Act has no statute of limitations, courts borrow the most analogous state limitations period as a guidepost for when laches presumptively applies. But the defense has a ceiling: courts frequently refuse to apply laches where the likelihood of confusion is strong or the infringement was intentional, on the theory that the public interest in avoiding confusion outweighs the defendant's reliance. Related doctrines include acquiescence (the plaintiff affirmatively assured the defendant it would not object), estoppel, and unclean hands. These defenses turn on the equities and rarely defeat a counterfeiting claim, but they regularly trim remedies--often limiting a plaintiff to prospective injunctive relief while barring back-damages. For a thorough treatment across IP, see understanding equitable defenses.

Prior use and the limited-area defense. A junior federal registrant's nationwide rights are subject to the rights of a good-faith prior user in the geographic area where that user was already operating before the registrant's constructive use date--the Tea Rose–Rectanus doctrine. Knowledge of the senior user, however, destroys the good faith on which the defense depends, as the Ninth Circuit underscored in Stone Creek v. Omnia. Common-law rights generally are explored in trademark rights under common law.

Remedies: What a Winner Actually Gets

Trademark law's remedies are designed to do three things at once: stop the wrong, strip the wrongdoer of ill-gotten gains, and compensate the owner. The principal tools, drawn from 15 U.S.C. §§ 1116–1118, are these.

Injunctive relief is the remedy most plaintiffs want most. A court can issue a preliminary injunction early in the case to halt the infringing use while the litigation proceeds, and a permanent injunction at the end. To obtain a preliminary injunction, a plaintiff must satisfy the familiar four-factor equitable standard from eBay Inc. v. MercExchange, L.L.C., 547 U.S. 388 (2006)--likelihood of success on the merits, irreparable harm, the balance of equities, and the public interest. Congress amended the Lanham Act in the Trademark Modernization Act of 2020 to add a rebuttable presumption of irreparable harm once a plaintiff establishes a likelihood of success (or, for permanent injunctions, an actual violation), 15 U.S.C. § 1116(a)--a meaningful thumb on the scale that restored the practical ease of obtaining injunctions in trademark cases after eBay had unsettled it.

Monetary recovery comes in several forms, often pleaded together:

  • The infringer's profits. The plaintiff can recover the profits the defendant earned from the infringement, on a disgorgement theory--the wrongdoer should not keep the fruits of the wrong. The plaintiff proves the defendant's gross sales; the defendant must then prove its deductible costs and any portion of profit not attributable to the infringement. In Romag Fasteners, Inc. v. Fossil, Inc., 590 U.S. 212 (2020), the Supreme Court held that willfulness is not a strict precondition to a profits award in an infringement case, resolving a longstanding circuit split--though the defendant's mental state remains highly relevant to whether disgorgement is equitable. (As noted earlier, the dilution provisions are stricter: willful dilution is required before a famous-mark owner may recover profits.)
  • Actual damages. The plaintiff's own losses--lost sales, harm to reputation and goodwill, and the cost of corrective advertising to repair consumer confusion.
  • Enhanced damages. The court may, in its discretion, award up to three times actual damages where the amount found is inadequate or the equities warrant, though the enhancement must compensate, not punish. 15 U.S.C. § 1117(a).
  • Counterfeiting remedies. As noted, mandatory treble damages and fees for willful counterfeiting, plus the statutory-damages election up to $2 million per mark per type of good.
  • Attorney's fees. Available "in exceptional cases." 15 U.S.C. § 1117(a). The Supreme Court's patent decision in Octane Fitness, LLC v. ICON Health & Fitness, Inc., 572 U.S. 545 (2014), construing identical "exceptional case" language, has been widely adopted in trademark cases, replacing the old rigid standard with a flexible totality-of-the-circumstances test for cases that "stand out" in the strength of a party's position or the manner in which the case was litigated.

Destruction and corrective relief. Courts can order the destruction of infringing articles, labels, and advertising under 15 U.S.C. § 1118, and can order transfer or cancellation of infringing domain names under the ACPA. A note on variability worth setting expectations around: trademark money awards swing wildly from circuit to circuit and case to case, because profits disgorgement, the apportionment of profit to the infringement, and the willfulness overlay all leave courts enormous discretion. For how trademark awards compare to other IP damages, see damage statistics--intellectual property litigation. And before any litigation begins, most disputes start with a letter--see drafting a trademark cease and desist letter and, from the receiving end, responding to a trademark cease and desist letter.

Where Disputes Are Resolved: Courts and the TTAB

Not every trademark fight is a federal lawsuit. Federal and state courts have concurrent jurisdiction over Lanham Act claims, but the overwhelming majority are filed in federal court, where judges are more familiar with the statute. Court litigation can address the full range of relief--injunctions, money, seizures, and validity.

Parallel to the courts sits the Trademark Trial and Appeal Board (TTAB), an administrative tribunal within the USPTO. The TTAB hears two kinds of inter partes proceedings. An opposition lets a party object to the registration of a mark within 30 days after it is published in the Official Gazette (extendable), on grounds such as likelihood of confusion, dilution of a famous mark, descriptiveness, or genericness. A cancellation lets a party seek to cancel a registration after it has issued, on overlapping grounds--though, importantly, the available grounds narrow after the registration is five years old (genericness, functionality, fraud, and abandonment remain available; mere descriptiveness and confusion generally do not). 15 U.S.C. § 1064.

The crucial limitation: the TTAB decides only the right to register, not the right to use. It cannot award damages or issue an injunction stopping anyone from selling anything. A party who wins an opposition keeps the other side off the register but must still go to court to stop marketplace use. The two forums interact in subtle ways--a TTAB ruling on likelihood of confusion can have preclusive effect in later court litigation under B&B Hardware, Inc. v. Hargis Industries, Inc., 575 U.S. 138 (2015), but only when the usages actually adjudicated by the Board materially match those at issue in court, a qualification that swallows a fair amount of the rule in practice. For TTAB practice, including the discovery mechanics, see our discovery-focused companion, discovery practice in TTAB trademark proceedings. Most oppositions and cancellations, it bears noting, settle--frequently through a coexistence agreement that lets the marks live side by side under negotiated restrictions on goods, channels, or geography.

State Law, Common Law, and the Whole Toolkit

The Lanham Act does not occupy the field. Trademark owners routinely add state-law claims to their federal complaints: common-law infringement and unfair competition (which protect marks built through use, registered or not), state statutory unfair-competition and deceptive-trade-practices acts, state dilution statutes (some of which, recall, still protect the niche fame the TDRA abandoned), and state counterfeiting statutes. These claims usually rise and fall with the federal confusion analysis, but they can offer remedies or reach conduct the federal statute does not, and they preserve a backstop if a federal theory falters. For the foundational layer, see trademark rights under common law and the general orientation in trademark basics and the trademark FAQs.

A Practical Enforcement Framework

The full enforcement picture is a layered one, and the smart move is rarely to file the biggest possible lawsuit first. A brand owner who finds a problem mark generally works through a rough escalation ladder, matching the tool to the goal and the budget.

Start by diagnosing the wrong: Is this a confusingly similar competitor (infringement), a famous-mark free-rider with no confusion (dilution), a squatted domain (ACPA/UDRP), a parallel importer (gray-market), an outright fake (counterfeiting), or a liar in advertising (Section 43(a)(1)(B))? Each maps to a different cause of action and a different forum. Then ask what you actually want: money, a stopped competitor, a transferred domain, seized goods at the border, or simply a clean register. The remedy you want often dictates the forum--only a court can give you damages or a use injunction; only the TTAB can clear the register; only CBP can stop a container.

In practice, a single dispute may call for several tools at once. A brand owner facing a serial infringer-counterfeiter might send a cease-and-desist letter; record its registration with CBP to stop counterfeit imports at the border; file a UDRP complaint or ACPA suit to recover squatted domains; oppose or cancel the offending application or registration at the TTAB; and sue in federal court for infringement, dilution, false designation of origin, and counterfeiting all at once, with parallel state claims, seeking a preliminary injunction, the infringer's profits, enhanced or statutory damages, fees, and destruction of the inventory. Proportionality is everything: the response to a tiny local user with a weak claim looks nothing like the response to an organized counterfeiting ring, and treating the former like the latter is how brand owners earn reputations as bullies and, occasionally, fee awards against themselves.

Key Takeaways

Trademark enforcement comes down to a small set of durable ideas. Infringement is about confusion--whether consumers are likely to be misled about source, sponsorship, or affiliation--and it is measured by a holistic, circuit-specific multifactor test in which no single factor controls. Dilution is different: it protects a small club of nationally famous marks against blurring and tarnishment even absent confusion, but it carries broad fair-use, news, and noncommercial-use exclusions and requires willfulness for any profits award. Liability runs beyond the direct infringer to contributory and vicarious actors--the platforms and suppliers behind the wrong. The ACPA handles bad-faith domain squatting with statutory damages and in rem jurisdiction, while the cheaper UDRP offers transfer-only relief. Section 43(a) reaches unregistered marks and adds a competitor's false-advertising claim. Counterfeiting triggers the statute's sharpest remedies--treble damages, seven-figure statutory awards, seizure, and criminal liability--and even genuine gray-market goods can infringe when materially different. Jack Daniel's (2023) narrowed the Rogers expressive-use shield: parody still matters, but when a mark is used as a source identifier for the defendant's own goods, ordinary confusion analysis governs. A robust defense bench--genericness, abandonment, functionality, descriptive and nominative fair use, the First Amendment, and equitable defenses like laches--keeps the system honest. And finally, the USPTO will not police your mark for you; vigilant, proportionate enforcement is what keeps a trademark strong.

This concludes the four-part overview. To revisit the foundations, see Part 1 on the subject matter of trademark law, Part 2 on substantive standards for protection, and Part 3 on obtaining protection and licensing.

Frequently Asked Questions

Do I have to prove someone was actually confused to win an infringement case? No. The legal standard is likelihood of confusion, not proof of actual confusion. Actual confusion is the most persuasive evidence a plaintiff can offer, but it is not required, and its absence is rarely fatal--especially early in a junior user's life, when there has not been enough time or market overlap for confusion to surface and be documented.

What is the difference between infringement and dilution? Infringement protects against confusion--consumers thinking the junior user's goods come from or are sponsored by the senior brand. Dilution protects the distinctiveness or reputation of a nationally famous mark even when no one is confused, on the theory that fame is a commercial asset worth shielding from erosion (blurring) and degradation (tarnishment). Most marks are not famous enough to qualify for dilution protection; nearly any valid mark can support an infringement claim.

Can I use another company's trademark in my advertising or content? Often, yes--within limits. Nominative fair use lets you name a brand to refer to that brand's own products (a repair shop advertising that it services HONDA cars; a comparative ad naming the competitor). Descriptive fair use lets you use a word in its ordinary descriptive sense even if it is someone's mark, so long as you use it in good faith and not as your own brand. News reporting, commentary, and genuine parody also enjoy protection. What you cannot do is use the mark in a way that suggests the brand sponsors or endorses you, or that confuses consumers about the source of your goods.

Did Jack Daniel's v. VIP Products kill trademark parody? No. Parody remains a legitimate and frequently winning position. The 2023 decision held that the speech-protective Rogers test does not apply when a defendant uses a mark as a mark--as a source identifier for its own product (there, a dog toy). In that situation, the case proceeds under ordinary likelihood-of-confusion analysis, where a clear, well-understood parody is actually less likely to confuse consumers and can still win. The change is procedural: parody now usually does its work inside the confusion factors rather than as an early exit from the case.

Someone registered a domain name using my brand--what can I do? Two main paths. The UDRP is a fast, relatively inexpensive arbitration-style process administered by providers like WIPO; its only remedies are transfer or cancellation of the domain. The ACPA (15 U.S.C. § 1125(d)) is a federal lawsuit that can recover statutory damages of $1,000 to $100,000 per domain and, through in rem jurisdiction, can reach anonymous or foreign squatters by suing the domain name itself. Brand owners often start with the UDRP and escalate to the ACPA when they want damages or face a serial offender. See our guide on filing a UDRP complaint.

Are gray-market goods illegal if the trademark on them is real? Sometimes. Gray-market (parallel-import) goods are genuine products bearing the genuine mark but made for sale abroad and imported outside authorized channels. They can still infringe under Sections 32 and 43(a) when they are materially different from the authorized U.S. version--different formulation, warranty, packaging, or quality controls--because those differences are likely to confuse consumers and harm the owner's goodwill. Recording your registration with CBP helps stop such imports at the border.

What remedies can I actually recover for trademark infringement? Injunctions (preliminary and permanent--with a statutory presumption of irreparable harm after the Trademark Modernization Act of 2020), the infringer's profits (no proof of willfulness strictly required after Romag, though willfulness still matters), your actual damages, up to treble enhanced damages where justified, attorney's fees in exceptional cases, and destruction of infringing goods. Counterfeiting adds mandatory treble damages, statutory damages up to $2 million per mark per type of good, ex parte seizure, and criminal exposure.

How long do I have to sue, and can waiting hurt me? The Lanham Act has no fixed statute of limitations, but waiting is dangerous. Courts borrow the most analogous state limitations period as a benchmark for laches, the equitable defense that bars relief when a plaintiff unreasonably delays and the defendant is prejudiced by the delay. Sitting on your rights can also support arguments of acquiescence or even abandonment, and chronic non-enforcement weakens the mark over time. Note, though, that laches often fails where confusion is strong or the infringement was intentional. Prompt, proportionate enforcement is part of owning a trademark.

Do I need a federal registration to sue for infringement? No. Section 43(a) of the Lanham Act provides a federal cause of action for unregistered (common-law) marks under the same likelihood-of-confusion standard, and state common law protects marks built through use. A federal registration is enormously valuable--it confers nationwide constructive rights, presumptions of validity and ownership, access to Section 32, eligibility for incontestability, and customs recordation--but it is not a prerequisite to enforcing rights you have earned through use.

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This article is general information, not legal advice. Trademark enforcement turns on the specific facts, the governing circuit's law, and fast-moving developments; consult qualified counsel before acting on any matter discussed here.