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The LCoNZ IRR restriction model uses item metadata and resource policies. Separate metadata fields hold the permanent state ("access level"), the embargo type (full vs partial) and the embargo expiry date. Customisations to core DSpace classes ensure that the appropriate resource policies are set up for each item and bitstream whenever the permanent or temporary state changes. Likewise, customisations to core DSpace classes ensure that these resource policies are actually honoured, building on the dark item modifications described by the DSpace@Cambridge folks.