Johnson model geometry is based on George W. Hart’s Virtual Polyhedra,
converted to JSON by Lee Stemkoski and packaged by Finn Pauls (polyhedra 1.0.0).
https://www.georgehart.com/virtual-polyhedra/johnson-info.html
https://github.com/finnp/polyhedra

Approximate coordinates have been numerically refined to regular unit-edge
polygon faces. The original incidence and the J1–J92 numbering are retained.
This is a private, noncommercial polyhedra collection.

The data for the polyhedra is copyrighted by George W. Hart.

Here is a copy of the original copyright text:

All the text and 2D images of Virtual Polyhedra are copyright 1996, 1997, 1998,
1999 by George W. Hart, with all rights reserved. They may not be reproduced in
any form without my expressed written permission, except for the incidental
reproduction which is inherent in your real-time viewing (and local caching)
of the information with a web browser.
However, upon request, I will likely grant reproduction permission for
noncommercial purposes. You can send me email at george@georgehart.com

An exception is the collection of individual *.wrl files which contain the
mathematical description of each polyhedron. Because these contain mathematical
information, they may be of use to others with an interest in polyhedra. They
may be reproduced and used for noncommercial purposes. Note that a written
comment to this effect is already present in each of the data files.

Source:  http://www.georgehart.com/virtual-polyhedra/copyright.html