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The DOI System is implemented through a federation of Registration Agencies (RA) who provide services to users (registrants):

•Registration Agencies must comply with the policies and technical standards established by the DOI Foundation, but are free to develop their own business model for running their businesses.

•Users can join a service offered by an RA by registering material with one of them, or developing a community to build an RA.

•Registrants ensure appropriate content management of their own material (maintenance of URLs and data), either directly or by contract (for example, with the RA).