A counterfeit copies a product and carries the brand's trademark, or a nearly identical one, so buyers think it is genuine: it is illegal. A knockoff, dupe or lookalike imitates the style without the brand's mark. It is often legal, unless it copies a protected design, distinctive trade dress or the brand's own photos and text.
A counterfeit copies a product and carries the brand's trademark, or one nearly identical to it, so that buyers believe they are getting the genuine item. It is illegal almost everywhere. A knockoff, dupe or lookalike imitates the style of a product without using the brand's mark. It is often legal, unless it copies a protected design, imitates distinctive trade dress or reuses the brand's own photos and descriptions.
This guide sets out the four terms side by side, the rights that decide whether a copy is lawful, what each case looks like on marketplaces and how brands usually respond. It is general information, not legal advice.
Four words, four different problems
The words are used loosely online, but the legal difference between them is real. What matters is not how close the copy looks, but which of your rights it uses.
| Term | What it is | Uses your trademark? | Usually legal? |
|---|---|---|---|
| Counterfeit | A fake presented as your product, with your brand name or logo | Yes, identical or nearly identical | No |
| Knockoff | A close copy of your design sold under another name, or no name | No | Sometimes: depends on design, trade dress and content rights |
| Dupe | A cheaper alternative marketed as similar to a famous product | No, though marketing may name you | Often, unless it copies protected elements or suggests a link |
| Lookalike | A product in the same style or category that resembles yours | No | Usually, unless it creates confusion or copies a protected design |
The dividing line is the trademark. Once the copy carries your mark, or a mark buyers cannot tell apart from it, it is no longer competition: it is passing itself off as you. US law defines a counterfeit as a spurious mark that is identical with, or substantially indistinguishable from, a registered mark.
The rights that decide what is legal
A copy is illegal when it takes something you own a right in. Four kinds of right come up in almost every marketplace case.
Trademark
Your brand name, logo and other signs that identify you as the source. Using them on copies is counterfeiting. Using something similar, such as a name one letter away or a near-identical logo, can be trademark infringement if buyers are likely to be confused.
Trade dress
The overall look of a product or its packaging: colors, shape, layout, when buyers recognize it as yours. In the US, unregistered trade dress can be protected under 15 U.S.C. 1125(a), but the owner has to prove it is not functional, and in practice also that buyers associate it with the brand. A lookalike box with the same colors and layout can cross this line even with a different name on it.
Design rights
A design patent in the US protects the ornamental appearance of an article, the way it looks rather than how it works. It lasts 15 years from grant. In the EU, designs can be protected by registration, and there is also shorter-lived protection for unregistered designs. A knockoff that reproduces a protected design can infringe even with no brand name at all.
Copyright in your photos and text
Your product photos and your written descriptions are creative works. In the US, copyright protects a work from the moment it is created and fixed, without registration, although registration is needed before suing for a US work. A seller who reuses your photos infringes your copyright even if the product itself is a lawful lookalike. This is often the easiest claim to prove, and the one handled by a DMCA takedown notice or a marketplace copyright report.
Style and ideas are free
None of these rights protects a general idea, a product category or a trend. A brand cannot stop others from selling a black puffer jacket or a stainless steel bottle. It can stop them from using its name, its protected design, its distinctive packaging and its photos.
What each looks like on marketplaces
| Case | What you see in the listing | Right that usually applies |
|---|---|---|
| Counterfeit | Your brand name and logo, often your photos, at a fraction of your price | Trademark (counterfeit) |
| Knockoff with your photos | A different or missing brand name, but your official product photos | Copyright |
| Knockoff of a patented design | Same shape and ornamentation as your patented product, own photos | Design patent or registered design |
| Lookalike packaging | Your colors and layout on a box with a similar-sounding name | Trade dress, trademark |
| Dupe marketing | "Like [your brand], for less" in the title or ad | Depends: accurate comparison may be allowed, implied affiliation may not |
| Generic lookalike | Similar style, own name, own photos | Usually none |
A frequent pattern online is the knockoff that avoids your name but copies your images. Because the brand name is missing, a keyword search does not find it. Searching by product photo does.
How brands respond
The right response depends on which right is at stake and how clear the case is.
- Identify the right. Decide whether the listing uses your trademark, your protected design, your trade dress or your content. If it uses none of them, there is usually no claim.
- Collect the evidence. Save the listing URL, a dated copy of the page and the seller's details. For a suspected counterfeit, a test purchase lets you compare the item with your genuine product.
- Report under the right category. Marketplace forms separate trademark, counterfeit, copyright and patent claims. A copied photo reported as a counterfeit, or a lookalike reported under a trademark it does not use, is likely to be rejected.
- Follow up and watch for relisting. Record the report reference and check whether the listing comes back under a new ID.
- Escalate when needed. Repeat sellers and large-scale copying may justify a cease and desist letter or advice from counsel.
Do not overclaim
Reporting a lawful lookalike as a counterfeit can hurt your standing with the marketplace and expose you to a challenge from the seller. For copyright notices in the US, knowingly false claims carry liability under 17 U.S.C. 512(f). Claim only the rights you hold and can show.
Protecting yourself before the copies arrive
Prevention decides which of these cases you can act on later.
- Register your trademark in the countries where you sell and manufacture, for both the name and the logo if you use one.
- Consider design protection for products whose appearance is what sells them, before you launch publicly: design registration and patent rules have deadlines tied to disclosure.
- Keep your original photo files with their dates. They show you created the images first.
- Make your packaging distinctive and use it consistently, which strengthens any later trade dress argument.
How Valigard helps
Valigard searches marketplaces worldwide for listings that reuse your official product photos. That matters most for knockoffs, which often skip your brand name but keep your images. Results are ranked by priority, a "name + photo match" tag shows listings that use both, and an optional AI check says whether a listing appears to show your product.
You decide how to classify each listing, and Valigard keeps the evidence: the URL, price, seller details and a saved, timestamped copy of the page. It does not determine with legal certainty that a product is counterfeit, and it does not file reports: you report on each marketplace, then log the outcome.
Frequently asked questions
Is selling a knockoff illegal?
Not automatically. Copying a general style or an unprotected product idea is usually lawful competition. A knockoff becomes a problem when it uses the brand's trademark or a confusingly similar one, copies a registered or otherwise protected design, imitates distinctive trade dress or reuses the brand's photos and descriptions.
Are dupes legal?
Many dupes are legal, because they imitate a look or a formula without using the original brand's mark. Marketing that names the original brand can still raise issues if it suggests a connection, and a dupe that copies a protected design or uses the brand's photos can infringe. Each case depends on its facts.
What makes a product counterfeit?
A counterfeit uses a mark that is identical with, or substantially indistinguishable from, a registered trademark, on goods the owner did not make or approve. The aim is to pass the product off as genuine. That is why a fake with the brand's logo is counterfeit, while an unbranded copy usually is not.
Can I report a lookalike product on Amazon or eBay?
Only if it infringes a right you hold. Marketplaces act on trademark, copyright and patent claims. A lookalike without your brand name can still be reported if it copies your patented design or uses your copyrighted photos, but a similar style alone is not a basis for removal.
Is it legal to buy counterfeit goods?
The rules for buyers vary by country. Enforcement generally targets people who make, import or sell counterfeits, but some countries also penalize buyers or seize fakes at the border, including items ordered for personal use. Check the rules of the country concerned.
Sources
- Cornell LII: 15 U.S.C. 1127, Construction and definitions
- Cornell LII: 15 U.S.C. 1125, False designations of origin
- USPTO: Design patent application guide
- U.S. Copyright Office: Copyright Basics FAQ
Last reviewed 27 Sep 2026. Marketplace procedures change; check the official pages before you file. This guide is general information, not legal advice.