This policy will DENY access to MRSID image datastreams by controlling access to the getDatastreamDissemination method of the Fedora Access Service (API-A). Specificallly, it will DENY access to users who are NOT of particular ROLES when the requested resource is a datastream with identifier of 'MRSID.'
urn:fedora:names:fedora:2.1:action:id-getDatastreamDissemination
MRSID
administrator
professor