evidence: Reasons for such restrictions can include export controls, privacy regulations, court orders, and ongoing criminal investigations, as well as national security. Information that was never classified is sometimes referred to as "open source" by those who work in classified activities. Public Safety Sensitive (PSS) refers to information that is similar to Law Enforcement Sensitive but could be shared between the various public safety disciplines (Law Enforcement, Fire, and Emergency Medical Services). [...] Sensitive Compartmented Information [edit]Classified information concerning or derived from sensitive intelligence sources, methods, or analytical processes. All SCI must be handled within formal access control systems established by the Director of National Intelligence.[33][34][35][20] [...] Thus established, all information generated within the compartment is classified according to the general rules above. However, to emphasize that the information is compartmented, all documents are marked with both the classification level and the codeword (and the caveat "Handle via <compartment name> Channels Only", or "Handle via <compartment names> Jointly" if the document contains material from multiple programs).