
As they state on Sprang’s site: "After Dutch holey cheese, there now is a Dutch font with holes as well." And they add: “Appealing ideas are often simple: how much of a letter can be removed while maintaining readability? After extensive testing with all kinds of shapes, the best results were achieved using small circles. After lots of late hours (and coffee) this resulted in a font that uses up to 20% less ink. Free to download, free to use.”
If you still have any doubts about the purposes or how to save with ecofont, their answers are here.
To download the font, follow these instructions depending on your operative system: http://www.ecofont.eu/downloads_en.html