This week's book giveaway is in the OCMJEA forum. We're giving away four copies of OCM Java EE 6 Enterprise Architect Exam Guide and have Paul Allen & Joseph Bambara on-line! See this thread for details.
I am a bit confused by your question. Do you want to add security credentials to block access to that directory? Is that directory home to a web application. Please explain how you want to limit access? You can always do a chmod to the directory in its most rudimentry form.