Can You Sell Birkenstock-Style Cork Footbed Sandals on Etsy? The 'A Court Ruled They're Not Copyrightable, So the Design Is Free' Myth

In February 2025 a headline went around every design and fashion outlet: "Birkenstock sandals are not art, German court rules." If you make cork-footbed sandals, clogs, or "comfort" slides, you probably saw it — and you probably drew the obvious conclusion. No copyright. Original patents expired decades ago. So the design must be public domain now, and a Birkenstock-style sandal is fair game to make and sell.

It is one of the cleanest-sounding myths I have seen, and it is wrong in a way that gets Etsy listings pulled every week. The court ruling was real. The expired patents are real. But "one type of protection was lost" is not the same as "there is no protection." Intellectual property rights stack, and each one is independent. Birkenstock lost a copyright argument in Germany while it was actively suing a US competitor in federal court over trademark, trade dress, and design patents — at the same time. Here is exactly what is protected, what genuinely is free, and where the line runs for an Etsy seller.

The short answer

You can sell an original cork-and-leather footbed sandal. You cannot sell a "Birkenstock," and you cannot reproduce the specific features Birkenstock has locked up as trademarks and registered trade dress — regardless of the German copyright ruling.

The functional idea of a contoured cork footbed with buckle straps is not owned by anyone; patents on the underlying construction have long expired, and that expiry genuinely does put the functional engineering into the public domain. What is still owned, and aggressively enforced, is the BIRKENSTOCK name, the model names (Arizona, Boston, Gizeh, Madrid), the bone-pattern sole, and a registered three-dimensional trade dress covering the exact look of the footbed and straps. Put any of those on a listing — in the title, the tags, or the description — and you are not selling a generic comfort sandal anymore. You are selling a knockoff, and Etsy will treat it as one.

What the German court actually decided (and what it didn't)

On 20 February 2025, the German Federal Court of Justice (the Bundesgerichtshof) dismissed three separate infringement cases Birkenstock had brought against companies selling lookalike sandals. Birkenstock had argued its designs were "works of applied art" — a category that would have earned copyright protection lasting 70 years after the designer's death.

The court said no. Its reasoning matters more than the headline: a work of applied art needs a level of artistic, creative achievement, and the court found the sandals were shaped primarily by technical and functional requirements — the orthopedic footbed, the practical strap arrangement — leaving too little room for free creative choice to clear the copyright bar. In plain terms: the sandal is a well-engineered functional object, not a sculpture, so German copyright law does not cover it.

Two things sellers routinely miss about this ruling:

First, it is a decision under German copyright law. It is not a US ruling, it does not touch US trademark or trade dress law, and it says nothing at all about Birkenstock's trademarks — the case was only ever about copyright. Reading "no copyright in Germany" as "no protection anywhere" is a category error.

Second, Birkenstock only reached for copyright because its patents had expired. Design and utility patents are time-limited on purpose — they give an inventor a monopoly for a set period, then release the invention to everyone. Birkenstock's original patents ran out, so it tried to backfill with copyright and lost. That is a company failing to extend protection it no longer has — not a court declaring open season on the brand.

Why "the patent expired" doesn't make the design free

This is the part worth being precise about, because there is a genuinely seller-favorable rule buried here — and then a trap right next to it.

The favorable rule: in the US, an expired utility patent is strong evidence that a feature is functional, and functional features cannot be claimed as trade dress. The Supreme Court said exactly this in TrafFix Devices, Inc. v. Marketing Displays, Inc., 532 U.S. 23 (2001). If a product feature exists because it works better, not because it identifies a brand, no one gets to own it forever by calling it trade dress after the patent lapses. So the cork footbed's shock absorption, the arch support, the adjustable buckle — the parts that are there for your feet, not for branding — are fair to copy. That is real, and it is the seller's strongest ground.

The trap: trade dress does not protect the functional parts. It protects the non-functional, source-identifying look — the specific combination of shapes a shopper recognizes as "that's a Birkenstock" even with the logo hidden. That kind of protection has no expiration date as long as the design stays distinctive and non-functional (Wal-Mart Stores v. Samara Bros., 529 U.S. 205 (2000)). A lapsed patent frees the engineering; it does not free the recognizable silhouette. Birkenstock has spent fifty years building exactly that recognition, and it has taken the extra step most dupe-makers assume it never bothered with: it registered the look.

If this "the old protection ran out, so it's fair game now" logic feels familiar, it is the same mistake sellers make with dead trademarks — see why an expired or abandoned trademark is not safe to use. Expiry of one right almost never means the coast is clear.

The rights that never went anywhere

Here is what Birkenstock owns in the US right now, none of which the German copyright case touched:

The wordmark. BIRKENSTOCK is a registered US trademark — Registration No. 1,037,893, on the books since 1976. It protects the name in any font, on any sandal, and it bites the instant the word appears in your listing. "Birkenstock dupe," "Birk-style," "looks like Birkenstock" — every one of those is unauthorized use of the mark. A disclaimer like "not affiliated with Birkenstock" does not cure it; if anything it proves you knew whose mark you were using.

The model names. Arizona, Boston, Gizeh, and Madrid are Birkenstock's product names, and the company has been filing and defending them as marks (GIZEH, for example, was filed with the USPTO in 2020). Sellers who carefully avoid the word "Birkenstock" and then title a listing "Arizona Two-Strap Cork Sandal" have walked straight into a different registered mark.

The bone-pattern sole. The distinctive jagged sole tread is claimed as a trademark in its own right, separate from the footbed.

The registered footbed trade dress. This is the one that surprises people. Birkenstock holds a three-dimensional trade dress registration describing the footbed and strap configuration in detail: a footbed with an embellished, defined edge; a sole with a jagged, uneven appearance; the bed appearing wider and deeper at the heel and tapering toward the front; a raised, wishbone-shaped strip in the front of the footbed; and two laterally connected uppers divided into front and rear straps with a rounded-rectangle gap between them. Reproduce that combination — the wishbone toe ridge, the deep-heel taper, the twin-strap arrangement — and you are copying registered trade dress, not a generic shape. This is the same doctrine that lets other footwear brands police their silhouettes; I walked through it in detail in the Converse Chuck Taylor trade dress breakdown.

Birkenstock is suing over exactly this — right now

The cleanest proof that the German headline changed nothing about US enforcement: while that copyright case was being decided, Birkenstock was prosecuting Birkenstock US BidCo, Inc. v. White Mountain International LLC in the US District Court for the District of Massachusetts (No. 1:24-cv-10610).

Birkenstock accused White Mountain of "systematically" copying and producing knockoffs of its footwear — specifically naming trade dress in the Arizona two-strap sandal, the Boston clog, and the Mayari toe-loop sandal, its trademark in the bone-pattern sole, and infringement of US Design Patent D919,257, a clog design the USPTO issued in May 2021. (Note that one: the original patents expired, but Birkenstock keeps filing new design patents on current models, so "the patents expired" is only half true.)

In 2025, Judge Patti B. Saris denied most of White Mountain's motion to dismiss, ruling that Birkenstock had adequately identified its design features and adequately pleaded that they are both distinctive and non-functional — the two things trade dress requires. The case moves forward. In fairness, White Mountain has filed counterclaims and the dispute is far from over — that is what a real trade dress fight between two shoe companies looks like: years of litigation and expert testimony over functionality.

But that is precisely the point for an Etsy seller. You will never get that fight. When someone reports your listing, Etsy removes it on the complaint, not on the merits — no judge, no functionality analysis, no chance to argue the German copyright ruling. You get a takedown and a strike, often within hours, and enough strikes close the shop. The multi-year federal battle is the luxury of a company with lawyers; the instant takedown is what actually reaches your storefront.

What actually gets the listing pulled

Brand-protection teams and the reporting tools they use do not just read your title. They read your tags and your description — and that is where dupe sellers convict themselves. The pattern is always the same: a laundered title like "Cork Comfort Footbed Slide Sandal — Handmade Leather" sitting on top of tags that read birkenstock, birkenstock dupe, arizona sandal, birk style, gizeh. The title is written for the algorithm to look clean; the tags are written to be found by shoppers searching the brand name. That mismatch is not a loophole — it is the confession. It tells an enforcement reviewer you know exactly whose customers you are trying to intercept.

So checking only your title is a false sense of safety. If the brand name or a model name is anywhere in the tags or the description, the listing is exposed. Scan all three fields the way an enforcement bot does. (This is also why a quick brand check before you list beats an appeal after you are suspended.)

The safe lane

None of this means you cannot sell a comfortable cork sandal. It means you sell yours, not a copy of theirs. Concretely:

• Design your own silhouette. A cork or EVA footbed with buckle straps is a free, functional format — build one that does not reproduce Birkenstock's registered configuration. Change the strap geometry, drop the wishbone toe ridge, use your own sole tread instead of the bone pattern. The further your shape sits from the registered trade dress, the safer you are.
• Keep the brand and model names out of everything. No "Birkenstock," "Birk," "Arizona," "Boston," "Gizeh," or "Madrid" in the title, the tags, or the description. And skip "dupe," "inspired by," and "copy of [brand]" — those phrases raise your risk, they never lower it, because they document intent.
• Describe the product, not the comparison. "Adjustable cork-footbed leather slide" sells the sandal on its own merits. "Birkenstock Arizona dupe" sells someone else's brand and hands a reviewer the evidence.
• Reselling a genuine pair is different. If you bought real Birkenstocks and are reselling them unaltered, the first-sale doctrine generally protects that resale — you may use the brand name truthfully to describe what it is. But the moment you customize, rework, or "upcycle" a genuine pair into something new, you are manufacturing, and first sale falls away.
• When in doubt, treat the shape like Crocs. The same layered analysis — expired utility patent, surviving trademarks, contested trade dress — plays out across comfort footwear; the Crocs and Jibbitz breakdown and the full Birkenstock brand guide both map which specific features bite.

The German court ruling is a real and interesting limit on copyright for functional design, and the expired patents genuinely freed the engineering underneath. But a brand is not one right — it is a stack of them, and the ones still standing over Birkenstock are the name, the model names, the sole, and the registered look of the footbed. Sell a sandal that is honestly your own and you are clear. Borrow the recognizable Birkenstock silhouette and its names to ride its search traffic, and the copyright headline you were counting on will not be in the room when your listing comes down.