Nimbus Sans and Nimbus Roman
Copyright URW Software / URW++ Design & Development
AGPL-3 with Font exception; see ../font-license.txt.

These original OTF source files were repackaged as WOFF without changing their names, outlines, metrics, or glyph sets.
Upstream source: https://github.com/ArtifexSoftware/urw-base35-fonts

Rebuild the WOFF files with Python fontTools:
from fontTools.ttLib import TTFont
font = TTFont("NimbusSans-Regular.otf")
font.flavor = "woff"
font.save("../sans-regular.woff")

Mappings:
{
  "sans-regular": "NimbusSans-Regular",
  "sans-bold": "NimbusSans-Bold",
  "serif-regular": "NimbusRoman-Regular",
  "serif-italic": "NimbusRoman-Italic"
}