Printing the Part: 3D Printing, CAD Files, and the Intellectual Property That Travels as a Download
By Casey Scott McKay ·
Additive manufacturing does something no earlier technology did to intellectual property: it converts a physical article into a file, and a file moves in ways an article never could. This article works through what actually happens to patent, design, copyright, trade dress, and trade secret rights when the thing being distributed is geometry rather than goods. It explains why the copyright in a technical drawing does not carry the right to stop someone printing the object it depicts, why direct patent infringement usually lands on the person who presses print rather than the person who posted the file, and why 3D scans of existing objects are frequently uncopyrightable. It then turns to the mechanisms that actually work in practice — file licences, authenticated print streams, bureau contracts, part serialisation, and takedown practice against repositories. It closes with the regulated corners, where printing a part is not merely an infringement question but an export, safety, or certification one.
IP and Technology > Patent Counseling Transactions | Article | Published 27 August 2025 - Updated 27 April 2026 | Casey Scott McKay - marksy.us
Summary. Additive manufacturing does something no earlier technology did to intellectual property: it converts a physical article into a file, and a file moves in ways an article never could. This article works through what actually happens to patent, design, copyright, trade dress, and trade secret rights when the thing being distributed is geometry rather than goods. It explains why the copyright in a technical drawing does not carry the right to stop someone printing the object it depicts, why direct patent infringement usually lands on the person who presses print rather than the person who posted the file, and why 3D scans of existing objects are frequently uncopyrightable. It then turns to the mechanisms that actually work in practice — file licences, authenticated print streams, bureau contracts, part serialisation, and takedown practice against repositories. It closes with the regulated corners, where printing a part is not merely an infringement question but an export, safety, or certification one.
Keywords: additive manufacturing · 3D printing · CAD files · STL files · digital inventory · design patents · useful article doctrine · technical drawings · indirect infringement · inducement · contributory infringement · 3D scanning · reverse engineering · print bureaus · digital rights management · file marketplaces · takedown practice · spare parts · serialisation · export control of technical data
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