model: Macbook 4.1(model id: 41)
subtype (notebook, netbook, motherboard, tablet):
notebook
does it have a free boot firmware (BIOS,UEFI,...) ?
no
can free operating systems be installed?
yes
does the device prevent installing wifi cards not-approved by the vendor?
yes (see the details inside the description entry)
year of commercialization:
2008
compatibility with free software:
D-bronze 
tested on:
Trisquel 4.0 Taranis
tested with the following kernel libre:
2.6.32-24-generic
video card model:
Intel Corporation Mobile GM965/GL960 Integrated Graphics Controller (rev 03) (works with 3D acceleration)
wifi model:
Broadcom Corporation BCM4321 802.11a/b/g/n (rev 03) (it does not work)
webcam model:
iSight (it does not work)
Description:
As far as I know, Macbook's bios won't let you replace your wifi card that easy. I never tested but at least be precarious.
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