Is the '20% change' rule real?
No. There is no percentage in U.S. trademark or copyright law — not 20%, not 30%, not any number. The legal test for trademark infringement is likelihood of confusion: could buyers think your design comes from, or is connected to, the brand? If the mark is still recognizable, changing colors, flipping it, or redrawing parts changes nothing. The myth survives because sellers repeat it to each other — platforms and courts don't use it. The reliable pre-listing test is the same one enforcement uses: compare your design visually against registered marks, which is what LogoVerify's free check does. (General information, not legal advice.)
Where the myth comes from: a misreading of copyright folklore ("change X% and it's a new work") imported into trademark territory, where it makes even less sense. Trademark infringement isn't measured by how much of the original you copied — it's measured by whether consumers would be confused about the source. A design that copies nothing literally can still infringe if it evokes the brand; a design that copies 50% of something unrecognizable might be fine.
What courts and examiners actually weigh (the DuPont factors, in plain terms): how similar the marks look and sound, how related the products are, how strong and famous the original mark is, and whether real-world confusion is likely. Famous marks get the widest protection — which is why "slightly different swoosh" designs get removed even when every line is technically different.
The practical takeaway for sellers: stop counting percentage changes and start checking recognizability. Look at your design the way a platform reviewer or brand-protection bot will: does it call a specific brand to mind? A visual similarity check against the trademark register answers that question with actual registered marks, side by side, before you commit the listing.
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