Today, Open Source Books, and the Innovation Institute.
Do Open-Source Books Work? is a question posed by Ben Crowell asked as part of the answer centered on technology and economics.
Open source, available for modification.
Semi-closed source, multiple treatments of same topic as arranged by the editor of a volume.
Closed source, the integrity of the work is preserved, and this may be important to the author.
Open Doc License-
Wikibooks