Taken verbatim from https://github.com/google/brotli/commit/d6d98957ca8ccb1ef45922e978bb10efca0ea541

Sources are under an MIT-style license. Also, Google has made a RF commitment here:
https://datatracker.ietf.org/ipr/2396
Excerpt:
"In addition, to facilitate the use of the Brotli Compression Algorithm in
other applications, Google hereby provides a W3C RF commitment (that is not
limited to font data) to the Brotli Compression Algorithm specification
linked above and, if that specification leads to a final IETF RFC for
Brotli, then to the specification in that RFC."
