Scott Leslie sends this paper over, commenting that it might muddy, rather than clarify, the identity waters. He's right, as the author brings in the whole 'card-space' approach to identity into the picture and suggests that the identity infrastructure will need to accommodate those as well as the simpler (and more functional) OpenID-type specifications. The identity space could become complex in a hurry (which of course suits the big companies well). Overall, an informed discussion, but the problem should not be characterized as a 'tragedy of the commons' but rather, unless we can keep companies from carving it up among themselves, a problem of 'theft of the commons' - a far more common, and tragic, scenario. PDF.
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