Pool & Share
The usefullness of information, ideas, knowledge, code and design grows the more that we share, use and adapt them to our purposes. They inhere a logic of abundance and are not depletable. Instead sharing allows more people to contribute to and benefit from them. Such resources can therefore be pooled & shared without really causing harm to anybody except those who insist upon fortifying a system of proprietarian resource control and privatized gain. This is understandable within a context of a capitalist economy, but it is not a law of nature.
Cap & Share or Mutualize But Don't Trade
Since material resources tend to be finite and hard to replenish over time, effective mechanisms for ensuring fair access without over-use are paramount. One way to do this is through a Cap & Share approach as opposed to the widely used Cap & Trade. It goes without saying, that the 'cap' has to be determined by those affected All Affected Principle and/or according to the real carrying capacity of the ecological and social systems.
Produce Cosmo-Locally
Share design and knowledge globally, it's light and easy, but produce whatever is heavy locally. This is a general principle for maximizing use and access while minimizing the ecological footprint of provisioning and services.
Set Semi-Permeable Boundaries
Unconditional access to everybody for everything and whatever purpose is not typical for a commons. Radically and unconditionally open systems can hardly deal with inherently finite resources nor with conflicting or antagonistic purposes. The bottom lin, is, however, to provide discrimination-free access, meaning no access and use prohibitions based on race, gender, nationality (!) and so on. This way you include potentially everybody while still being able to set SEMI-PERMEABLE BOUNDARIES in a self determined way.
Remember: The boundaries around commons are not simply "open" or "closed."
Create Discrimination-Free Infrastructures
Infrastructures and platforms - for transportation, communication or services - need to be accessible to everyone on a same basis. Those with greater money, status or power must not be able to "crowd out" the ability of others to use a given transport system, energy- or communications network. It's a matter of fairness and equipotentiality. There is no reason why we should not apply the core principle of common carriage rules, the logic foundation & precursor for net neutrality, to all infrastructures.
Prefer Predistribution to Redistribution
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Rely on Distributed Structures
add the idea, that "distributed systems" are different from decentralized one, as the latter are still framed by a top-down relation/ structure, whereas the former are more like networks where each dot can be connected do each other dot, which leads us to the idea of cirlces and Federations of Commons