The Spectrum logo was designed by hazelnot, and is released under the Creative Commons Zero license.
Two versions of the logo are available. The first is an SVG file suitable for web browsers, and the second is an SVG file suitable for Inkscape. The difference between the versions is in how the colored ring is implemented, since standard SVG has no way of drawing conic gradients. The browser version uses an embedded HTML element with a CSS conic gradient, and the Inkscape version uses the not-yet-standard SVG Mesh Gradients.
Permission is granted to copy, distribute and/or modify this document under either the terms of the Creative Commons Attribution-ShareAlike 4.0 International License, or the GNU Free Documentation License, Version 1.3 or any later version published by the Free Software Foundation; with no Invariant Sections, no Front-Cover Texts, and no Back-Cover Texts.