Hey thanks for skratchdot/color-blind, looks like a super useful package!
I'd love to use it in the project I'm working on but have a question about the
license.

The comment for the Color Blindness Simulation function mentions
non-commercial use without HCIRN permission. As the MIT license allows
commercial uses I think it's incompatible?

Although I found on Matthew Wickline's site this update:

20151129 UPDATE
HCIRN appears to no longer exist. This makes it impractical
for users to obtain permission from HCIRN in order to use
color_blind_sims() for commercial works. Instead:

This work is licensed under a
Creative Commons Attribution-ShareAlike 4.0 International License.
http://creativecommons.org/licenses/by-sa/4.0/

Source: http://colorlab.wickline.org/colorblind/colorlab/engine.js

CC4-BY-SA does allow commercial use, but requires anything which
builds on the project to be distributed with the same license, so I think
this project should also be CC4-BY-SA or a compatible license?
https://creativecommons.org/licenses/by-sa/4.0/