As far as I know the license under which Wikipedia articles are written is GPL and that means they may not sell it. So when selling the WIkipedia book or encyclopedia they are breaking the GPL license?
I guess I must have it wrong somewhere because they wont be that stupid to publish the book using the contributions of thousands of people that made their writings available under GPL.
So GPL writing may be printed and sold?
Somehow seems wrong doesn't it? Surely the authors all would deserve royalties