ElectroBSD "case study"

What is the Electro Beer Software Distribution?

"ElectroBSD is an experimental operating system designed
to be used in hostile environments like Germany.
[...]
Obviously this list of features is incomplete, for additional
features, please have a look at FreeBSD's Technological Advances
(which ElectroBSD inherits)."

Source:
https://www.fabiankeil.de/gehacktes/electrobsd/
(not yet online)

Maybe you can guess where most of the ElectroBSD code is coming from ...