Open Source Software Licenses

All third-party libraries, fonts, and cartographic engines utilized within the Hugo Carbon Theme are licensed under permissive open-source licenses and are hosted locally under /static/.

1. Theme Engine

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Copyright 2026 Hugo Carbon Contributors

Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at

    http://www.apache.org/licenses/LICENSE-2.0

2. IBM Carbon Design System & IBM Plex Fonts

• IBM Carbon Design System (@carbon/styles, @carbon/web-components, @carbon/icons): Copyright IBM Corporation. Licensed under the Apache License 2.0.
• Lit Web Components Runtime (lit, @lit/reactive-element): Copyright Google LLC. Licensed under the BSD 3-Clause License.
• IBM Plex Typeface Family (Sans, Serif, Mono, Math): Copyright IBM Corporation. Licensed under the SIL Open Font License 1.1.

3. Client-Side Engines & Libraries

• KaTeX: Fast mathematical typesetting. Copyright Khan Academy and other contributors. Licensed under the MIT License.
• MapLibre GL JS: Vector cartography engine. Copyright MapLibre contributors. Licensed under the BSD 3-Clause License.
• Mermaid.js: Declarative diagramming. Copyright Knut Sveidqvist. Licensed under the MIT License.
• Highlight.js: Syntax highlighter. Copyright Ivan Sagalaev. Licensed under the BSD 3-Clause License.
• Chart.js: HTML5 canvas charting. Copyright Chart.js contributors. Licensed under the MIT License.