Patent ID: 8272062

Claim:
A content control server comprising: a plurality of group identifiers, each being used to identify a group composed of a plurality of users; a plurality of memory areas, each of which corresponds to one of the plurality of group identifiers; a request accepting unit that accepts an acquisition request for a first content stored in one of the plurality of memory areas; and a content delivery processing unit that compares an identifier of a source of the acquisition request with the plurality of the group identifiers, if the identifier of the source of the acquisition request matches the group identifier of the one of the plurality of memory areas, permits the delivery of the first content and sends the first content to the source of the acquisition request, if the identifier of the source of the acquisition request does not match any of the plurality of the group identifiers, determines whether or not a predefined acquisition permission identifier of the source of the first content matches with the identifier of the source of the acquisition request and sends the first content to the acquisition request source if the predefined acquisition permission identifier of the first content matches the identifier of the source of the acquisition request.