All of Liferay's portlets support Liferay's robust, fine-grained permissions system. Some higher level permissions can be configured here: whether a role can add the portlet to a page, can configure the portlet, or whether the role can view the portlet. To set these permissions, go to the Configuration menu and click on Permissions. This will show you a table of roles defined in the portal. Select which roles are allowed to see the portlet and which roles are allowed to configure the portlet, and then click Submit.