When I started work on DRM for eduSource, the demand for this sort of service was heard from some quarters. But a single signon is contrary to an open system. So, for that matter, is the sort of federated identity sharing described in this article. It requires, as the author notes, a "web of trust" - which means that participation in the network must be restricted to organizations you trust. And who makes this call? Still, this sort of discussion persisted until I declared that DLORN would not require a logon, to protect personal privacy. This pressed the question of whether other members were willing, in effect, to trust external agencies with acting as gatekeepers. Systems like Shibboleth can work, for small networks of very trustworthy entities, such as a university community. But if you want to extend your reach beyond this, access must be managed in a different manner.
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