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An embargo is a temporary access restriction placed on metadata or bitstreams (i.e. files). Its scope or duration may vary, but the fact that it eventually expires is what distinguishes it from other content restrictions. For example, it is not unusual for content destined for DSpace to come with permanent restrictions on use or access based on license-driven or other IP-based requirements that limit access to institutionally affiliated users. Restrictions such as these are imposed and managed using standard administrative tools in DSpace, typically by attaching specific access policies (aka or "resource policies") to Items, Collections, Bitstreams, etc.

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When an embargo is set on either an item level or a bitstream level, a new ResourcePolicy (i.e. access policy) is added to the corresponding Item or Bitstream. This ResourcePolicy will automatically control the lifting of the embargo (when the embargo date passes). An embargo lift date is generally stored as the "start date" of such a policy. Essentially, this This means that the access rights defined in the policy do not get applied until after that date passes (and prior to that date, the access rights will default to Admin only).

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