all distro's of linux are free, THIS is a legal binding in linux im pretty sure to do with the GNU.
It is not illegal to download any distro of linux, I would recomend SUSE 9 also, great support and ease of use (I dont mean the kind of support you pay for, the kind that means it works well with lots of stuff).
Im pretty sure its actually illegal to sell linux and not allow free distribution.
edit: sadly because Ru is leaving emuparadise (I hope his life goes really well) this will have to be advice to those others interested in this topic.
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Now we know how viral bunny signatures really spread.