Open Office fonts

[Oren]

Hi,
I have a customer who is testing OOF 1.1 (so far he is very happy), but
has one interesting question, he would like to know if we have any leagl
issues with the fonts which OOF uses? if i'm correct OOF uses the fonts
of the OS (LInux or WIndows) is it 100% true? are we using any other
fonts that the user get when he installs OOF? if so, are these fonts
free?
Thanks,
Oren.