"The commons is a way of allocating access and use rights in resources that does not give anyone exclusive rights to exclude anyone else.
A city street is a commons: anyone who has a car or a bicycle can drive on the road; anyone who can walk or use a wheelchair can travel the sidewalks. No individual or company has the right to exclude anyone or charge them for access. From streets and highways, to canals and waterways, major shipping lanes and navigable rivers; basic scientific knowledge, mathematical algorithms, basic ideas; all these have been kept as commons in modern market economies because they provide enormous freedom of action to a wide range of productive behaviors—both economic and social.
Wikipedia and the free open source software have become examples of remarkable innovation in the production of information."