they changed their website recently and it's not on there anymore. there are no take backs on free downloads on the internet
http://en.wikipedia.org/wiki/Daggerfall
http://www.bethblog.com/2009/07/09/d...able-for-free/On July 9, 2009, Bethesda made Daggerfall available as a free, legal download on their website, commemorating the 15th anniversary of The Elder Scrolls franchise.[2]
hopefully that's official enough for you.
oh found it on their updated website:
http://www.elderscrolls.com/daggerfall/
don't see why people have to be so anal that I linked to a different mirror. (when you could have spent 4 seconds googling it to see that it's legit)
you can download arena as well: http://www.elderscrolls.com/arena/