Simply stated, Watermark 3D is a unique system for embedding hidden information into an STL file without any structural changes or visual marks. The watermark can only be detected if the STL file is uploaded to Watermark 3D and with the correct password. Compare it with traditional watermarks on bank notes where the identifying patterns are only visible when the note is held against a light. As for 3D models, our watermarks are near impossible to detect or duplicate.