At this time the limitation of 3 clients per user is in place as we found that during testing the database from Red Library (15415 links) was being fully validated quite quickly just by the clients testing it at the time. With the prediction that more clients would be running once the project was live, we decided at this point to put a limit on the number of clients per user that can participate. This limit will be altered (or even removed) as the total number of links within Red Library increases or as more features are added that create more work for the DLV to perform.