Provide a URL to a document that specifies the protocol to gain access to the resource.
Rationale: Some digital resources comprise of sensitive data, and require additional measures (such as institutional review board approval) to be followed before access can be granted. The A in FAIR does not imply that the resource must be Open or Free, but it does require that the exact conditions and the process to access restricted data are transparent and made public. Any additional authentication and authorization procedures must be specified. Therefore, prior to the release of a restricted digital resource, publishers must take steps to clarify eligibility and process. To satisfy this metric, the resource is either provided with no additional security protocol, or that the protcol is clearly specified in a web-accessible document (preferably the resource metadata!)