# Vibur — Upstream Source Investigation

**Model**: Claude Opus 4.6
**Date**: 2026-03-25
**Investigator**: AI agent (Claude) under guidance of @felipesanches

**Designer**: Johan Kallas

## Source Repository

Source files were found in the **googlefontdirectory-hg** monorepo at commit `52f780bc9d197280a9f430574e179a5f233c56b6`, under the path `vibur/src/`.

### Source Files

- **VFB (FontLab)**: Vibur-Regular.vfb

Sources are in VFB format (FontLab, proprietary), which is not buildable with gftools-builder.

## Investigation Details

The font was created by Johan Kallas (`johan.kallas@gmail.com`). Searches were conducted for GitHub repositories under the names "Vibur", "Johan Kallas", and related terms, but no dedicated font source repository was found. The `librefonts/vibur` mirror was identified but excluded per policy. No UFO, Glyphs, or other open-format source files were found in any publicly accessible repository.