Non-excludability - Once provided it is for everybody, you can't stop anyone using it.
Non-rivalry - when you consume good it doesn't reduce amount available to others.
Related ...
Non-excludability - once the good is provided it is impossible to stop people consuming it even if they haven't paid.
An example of this is defence.
approaches, the provision of public goods may often be handled through ordinary market forces if some way can be found to link the consumption of the public good to the consumption of some other good that does not suffer from the "non-excludability" ...
These laws attempt to remove the natural non-excludability by prohibiting reproduction of the good.
The combination of non-rivalry and non-excludability means that it can be hard to get people to pay to consume them, so they might not be provided at all if left to MARKET FORCES.
 See also: Public good, Public goods, Free rider, Rival, Optimal
  
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