Libreboot is such an unfortunate name, as you could also read the name as a library dedicated to rebooting a computer.
Hell, even the OpenOffice fork was called LibreOffice.
That's not really "libre", but either libro (book) or librería (bookshop).
You may see libre on parkings [0].
[0] https://www.burguet.es/fotos/cartel_vinilo_retroiluminado.jp...