The Wikipedia articles give a good overview
  https://en.wikipedia.org/wiki/Computer_Corporation_of_America
  https://en.wikipedia.org/wiki/Gosling_Emacs

We had one of the first Pyramid minicomputers, so we got lots of stuff to
port.

RMS claimed he modified the earlier, freely redistributable, version of
Gosling Emacs, not the one Unipress sold.
The skull and crossbones referenced above is at
https://donhopkins.com/home/archive/emacs/skull-and-crossbones.txt

Years later, Lucid forked it (now at xemacs.org) and the personalities
involved caused the "great Emacs schism"  A pox on both their houses, I say
:)