"Downloading and distributing for free is not even half the story. As the licence is SA, everyone is free to make changes to them – say farewell to the days of textbooks with US-specific references or out of date pricing. Does the example in the text book refer to buying a penny white loaf at Banbury Cross? Why, then change it to $2:00 wholemeal loaf in Sydney, a $3.80 milkshake at Ettalong Beach (for school children in that area) or even something from the tuckshop of the specific school it’s used in. If there is something wrong with a chapter, take it out and replace it with a better chapter. Over time such books will reach optimal quality – perhaps even in the absence of structured review (in that bad variants will be less used by teachers)."
