Agree, except that the underpinning is about about the freedom to improve and share, which generally means there's a freely available version on the internet, b

Agree, except that the underpinning is about about the freedom to improve and share, which generally means there's a freely available version on the internet, but by no means means you can't or shouldn't buy electronic or paper copies for money to support the author. ie. the gnu make manual: http://shop.fsf.org/product/gnu-make-version-381/ http://shop.fsf.org/product/gnu-make-version-381/