This code was originally written by Thomas G. Lane and Todd Newman,
and proposed for inclusion in the Independent JPEG Group's software.
However, that fell through when Tom left the IJG. It was not written by
Marti Maria - Little cms only had a copy of that code.
This code has recently been merged into libjpeg-turbo, so it seems
reasonable to now consider libjpeg-turbo as the canonical source of
these files. However, since the GIMP carries the original version of
the code proposed for IJG's JPEG, and doesn't contain any of the more
recent and minor tweaks made during its inclusion in libjpeg-turbo,
only the original copyright holders (ie., Thomas G. Lane and Todd
Newman) are mentioned.
The relevant license text was lifted from the Independent JPEG Group's
software, similar to the way it's done in Chromium and other users of
this code.
https://gitlab.gnome.org/GNOME/gimp/issues/2119
Debarshi Ray