DESIGN INTELLIGENCEJune 17, 2026·Mary · DEPIX Design Intelligence

The fender you're not allowed to copy

The most profitable line a car designer draws is the one around a part that only exists because the car got hit. A fender, a bumper, a headlamp, a tailgate — register its appearance as protected, and you have made yourself the only legal source for that part for the life of the model. The repair part is not an afterthought of the design. On a long enough timeline it is the design's most reliable customer, and the studio knows it before the clay is cut.

The contested surface here is not a curve or a crease. It is the legal envelope drawn around the curve — the design patent in the United States, the registered design in Europe — that turns a visible body panel into a part you are forbidden to manufacture even when you can make it perfectly. Every other report treats the panel as a styling decision. This one treats the monopoly on copying it as the design decision, because that is increasingly where the money and the lawsuits are.

The part the customer never chose to buy

Nobody specifies a replacement front fender at purchase. It is bought, if at all, after a collision, by an owner or an insurer who wants the car to look the way it did. That is the entire leverage: a "must-match" part has no design freedom left — to restore the car's appearance it must be a copy of the original. So if the original's appearance is legally protected, the only lawful supplier of the copy is the company that drew it.

The industry has built a deliberate, decades-long business on exactly this. General Motors makes its own replacement panels and has gone to court to keep anyone else from copying them. When parts supplier LKQ kept producing GM fenders and bumpers after their supply deal ended, GM sued for design-patent infringement — because the aftermarket parts were, by necessity, exact copies of the patented originals (Repairer Driven News, 13 May 2020). Ford ran the same play and won a different way: it settled with LKQ on terms under which LKQ became the only distributor of non-OEM copies of Ford's design-patented collision parts, paying Ford a royalty on every one (aftermarketNews, accessed Jun 2026). Read that twice: the "independent" aftermarket part is licensed back from the maker, with the maker taking a cut. The monopoly didn't lose. It just started charging rent.

This costs real money, and it lands on people who didn't choose the design

The bill for protecting the appearance of a fender does not fall on the designer or the carmaker. It falls on the owner and the insurer at the worst possible moment — after a crash. Alternatively-supplied collision parts typically run 26% to 50% cheaper than the carmaker's own, and the parts most aggressively patented are the visible outer ones a wreck always needs (Repairer Driven News, 29 Mar 2023). Consumer-side analyses put the additional cost American drivers absorb on collision repairs, because design patents keep competing parts off the market, north of $1.5 billion a year (Repairer Driven News, 29 Mar 2023).

That number is why the fight keeps reaching legislatures. The U.S. SMART Act (Save Money on Auto Repair Transportation Act), reintroduced in March 2023, would cut the enforceable term of a design patent on a collision-repair part specifically from the standard fourteen years down to thirty months — long enough to reward the original design, short enough to stop it metastasising into a fifteen-year repair monopoly (Repairer Driven News, 29 Mar 2023). It has been introduced, in one form or another, for over a decade and has not passed. The monopoly is worth more to defend than the reform is worth to win.

Then the ground moved under the whole portfolio — twice in one year

For forty years, a carmaker could register the appearance of nearly any panel and feel safe, because U.S. design-patent obviousness was judged under the rigid Rosen-Durling test that made these patents very hard to invalidate. That ended on 21 May 2024, when the full Federal Circuit, sitting en banc in LKQ Corp. v. GM Global Technology Operations LLC, threw the test out — calling it "improperly rigid" and out of step with Supreme Court precedent, and ruling that design patents must now face the same flexible obviousness standard as everything else (Patently-O, 21 May 2024). Overnight, a fender that merely recombines familiar shapes became far easier to attack. A pile of design patents that looked like an asset became, in part, a liability waiting for a challenger.

Europe moved the other way, on purpose. On 11 October 2024 the Council of the EU adopted a single, harmonised "repair clause" into the new EU Design Regulation (Reg. 2024/2822) and the recast Design Directive: design protection simply does not apply to a visible component part used "for the sole purpose of the repair of that complex product so as to restore its original appearance" — explicitly body panels, headlamps and windscreens (FIGIEFA, 11 Oct 2024). From 1 May 2025 the new regime applies, with a transition allowing some national protections to survive until 2032 (Taylor Wessing, 13 Mar 2025). So the same fender is now a defensible monopoly in one market, an open part in another, and an easier-to-invalidate patent in a third — and that split is not a footnote a designer can leave to legal. It changes what is worth drawing.

The part of design nobody puts in the brief

Here is the uncomfortable reality the render never shows: the appearance of a repair part is a strategic decision before it is an aesthetic one, and the decision points in opposite directions at once.

Make the visible panels distinctive and protectable, and in the U.S. you can lock the aftermarket out for years and capture the entire repair stream — at the cost of being the named defendant when a $1.5bn consumer-cost argument and a right-to-repair coalition come looking, and at the risk that, post-LKQ, the patent doesn't survive a real challenge. Make them deliberately generic and shared across the range, and you forfeit the monopoly but cut your own warranty and parts-logistics cost and dodge the regulatory blast radius. In Europe, the choice has largely been made for you — the repair clause says the must-match part is fair game regardless of how distinctive you drew it. A single global model has to satisfy all three answers, and the panel that is a profit centre in Michigan is an open part in Munich.

That is four parties touching one curve and none of them seeing the same object. The designer sees a surface. The aftermarket strategist sees a fifteen-year annuity. The general counsel sees, after 21 May 2024, a patent that might not hold. The owner and the insurer — never in the room — see a repair bill 26-50% higher than it needed to be. The render on the wall shows a pristine, undamaged car. It cannot show the only states where this decision actually pays out or blows up: the same panel as a crash part, priced as an OEM monopoly versus an open copy; the distinctive crease that wins a design patent in the U.S. sitting next to the EU repair clause that ignores it; the generic shared panel that gives up the annuity to lower the legal and warranty risk.

Where the decision goes wrong — and what we do about it

The failure mode is not ugliness. It is that the most consequential property of a body panel's appearance — whether you can defend a copy-monopoly on it, in which market, and for how long — is the one property a hero render is structurally incapable of showing, and the one most likely to be decided by default. The studio signs off a beautiful, undamaged shape. The strategy and the exposure get sorted out later, by lawyers, after the tooling is cut and the model is on sale across three legal regimes that disagree.

This is exactly the gap DEPIX Design Intelligence is built to close. Not to draft the patent — to put the call (protect-and-monetise / generic-and-shared / market-by-market) in front of the design chief as photoreal evidence in the states the showroom render structurally hides: the panel as the crash part it will spend its life being, with an OEM-monopoly price and an open-copy price on the same image; the U.S.-protectable crease next to the EU-repair-clause reality so the split is visible and not abstract; the distinctive version and the shared-platform version side by side with their repair-stream value and their litigation exposure attached. Side by side, at decision time, while the surface is still a sketch and not a tooled, patented, eventually-litigated commitment.

The point of design intelligence is to use the intelligence of AI to make the better decision before the geometry is frozen and the design rights are filed. Draw the beautiful, undamaged car — of course. Then render the only states that decide the business: the part broken, the part copied, the part priced two ways, the law saying opposite things in two markets. Put the monopoly play and the open play next to each other with their real numbers on while the line is still cheap to move. The photoreal output is the evidence. The decision is the product.

For most of a century, the shape of a fender was a question of taste. It is now also a question of who is legally allowed to make the next one — and that question is being answered, right now, on a drawing of a car that has never been hit, by people who will never see the repair bill.