Abstract: The present application relates to a computer having a processor configured to execute a set of instructions to render a customised version of a restricted document object model. A restricted element in a document object model is identified and at least one rule associated with the restricted element is accessed. The at least one rule is applied to the restricted element to generate a modified document object model which is then rendered. A related computer-implemented method is also covered by the present application. The present application relates to server-side authentication techniques; content filtering based on user-specific and context-based requirements; and audit trail techniques.